adr: Higher order topologies

These types of Topologies will orchestrate behavior in regular Topologies.

For example, a FailoverTopology is a Higher Order, it will orchestrate its capabilities between a primary and a replica topology. A great use case for this is a database deployment. The FailoverTopology will deploy both instances, connect them, and the able to execute the appropriate actions to promote de replica to primary and revert back to original state.

Other use cases are ShardedTopology, DecentralizedTopology, etc.

adr/015-higher-order-topologies.md

@@ -0,0 +1,114 @@
+# Architecture Decision Record: Higher-Order Topologies
+
+**Initial Author:** Jean-Gabriel Gill-Couture  
+**Initial Date:** 2025-12-08  
+**Last Updated Date:** 2025-12-08  
+
+## Status
+
+Implemented
+
+## Context
+
+Harmony models infrastructure as **Topologies** (deployment targets like `K8sAnywhereTopology`, `LinuxHostTopology`) implementing **Capabilities** (tech traits like `PostgreSQL`, `Docker`).
+
+**Higher-Order Topologies** (e.g., `FailoverTopology<T>`) compose/orchestrate capabilities *across* multiple underlying topologies (e.g., primary+replica `T`).
+
+Naive design requires manual `impl Capability for HigherOrderTopology<T>` *per T per capability*, causing:
+- **Impl explosion**: N topologies × M capabilities = N×M boilerplate.
+- **ISP violation**: Topologies forced to impl unrelated capabilities.
+- **Maintenance hell**: New topology needs impls for *all* orchestrated capabilities; new capability needs impls for *all* topologies/higher-order.
+- **Barrier to extension**: Users can't easily add topologies without todos/panics.
+
+This makes scaling Harmony impractical as ecosystem grows.
+
+## Decision
+
+Use **blanket trait impls** on higher-order topologies to *automatically* derive orchestration:
+
+````rust
+/// Higher-Order Topology: Orchestrates capabilities across sub-topologies.
+pub struct FailoverTopology<T> {
+    /// Primary sub-topology.
+    primary: T,
+    /// Replica sub-topology.
+    replica: T,
+}
+
+/// Automatically provides PostgreSQL failover for *any* `T: PostgreSQL`.
+/// Delegates to primary for queries; orchestrates deploy across both.
+#[async_trait]
+impl<T: PostgreSQL> PostgreSQL for FailoverTopology<T> {
+    async fn deploy(&self, config: &PostgreSQLConfig) -> Result<String, String> {
+        // Deploy primary; extract certs/endpoint;
+        // deploy replica with pg_basebackup + TLS passthrough.
+        // (Full impl logged/elaborated.)
+    }
+
+    // Delegate queries to primary.
+    async fn get_replication_certs(&self, cluster_name: &str) -> Result<ReplicationCerts, String> {
+        self.primary.get_replication_certs(cluster_name).await
+    }
+    // ...
+}
+
+/// Similarly for other capabilities.
+#[async_trait]
+impl<T: Docker> Docker for FailoverTopology<T> {
+    // Failover Docker orchestration.
+}
+````
+
+**Key properties:**
+- **Auto-derivation**: `Failover<K8sAnywhere>` gets `PostgreSQL` iff `K8sAnywhere: PostgreSQL`.
+- **No boilerplate**: One blanket impl per capability *per higher-order type*.
+
+## Rationale
+
+- **Composition via generics**: Rust trait solver auto-selects impls; zero runtime cost.
+- **Compile-time safety**: Missing `T: Capability` → compile error (no panics).
+- **Scalable**: O(capabilities) impls per higher-order; new `T` auto-works.
+- **ISP-respecting**: Capabilities only surface if sub-topology provides.
+- **Centralized logic**: Orchestration (e.g., cert propagation) in one place.
+
+**Example usage:**
+````rust
+// ✅ Works: K8sAnywhere: PostgreSQL → Failover provides failover PG
+let pg_failover: FailoverTopology<K8sAnywhereTopology> = ...;
+pg_failover.deploy_pg(config).await;
+
+// ✅ Works: LinuxHost: Docker → Failover provides failover Docker
+let docker_failover: FailoverTopology<LinuxHostTopology> = ...;
+docker_failover.deploy_docker(...).await;
+
+// ❌ Compile fail: K8sAnywhere !: Docker
+let invalid: FailoverTopology<K8sAnywhereTopology>;
+invalid.deploy_docker(...); // `T: Docker` bound unsatisfied
+````
+
+## Consequences
+
+**Pros:**
+- **Extensible**: New topology `AWSTopology: PostgreSQL` → instant `Failover<AWSTopology>: PostgreSQL`.
+- **Lean**: No useless impls (e.g., no `K8sAnywhere: Docker`).
+- **Observable**: Logs trace every step.
+
+**Cons:**
+- **Monomorphization**: Generics generate code per T (mitigated: few Ts).
+- **Delegation opacity**: Relies on rustdoc/logs for internals.
+
+## Alternatives considered
+
+| Approach | Pros | Cons |
+|----------|------|------|
+| **Manual per-T impls**<br>`impl PG for Failover<K8s> {..}`<br>`impl PG for Failover<Linux> {..}` | Explicit control | N×M explosion; violates ISP; hard to extend. |
+| **Dynamic trait objects**<br>`Box<dyn AnyCapability>` | Runtime flex | Perf hit; type erasure; error-prone dispatch. |
+| **Mega-topology trait**<br>All-in-one `OrchestratedTopology` | Simple wiring | Monolithic; poor composition. |
+| **Registry dispatch**<br>Runtime capability lookup | Decoupled | Complex; no compile safety; perf/debug overhead. |
+
+**Selected**: Blanket impls leverage Rust generics for safe, zero-cost composition.
+
+## Additional Notes
+
+- Applies to `MultisiteTopology<T>`, `ShardedTopology<T>`, etc.
+- `FailoverTopology` in `failover.rs` is first implementation.

adr/015-higher-order-topologies/example.rs

@@ -0,0 +1,153 @@
+//! Example of Higher-Order Topologies in Harmony.
+//! Demonstrates how `FailoverTopology<T>` automatically provides failover for *any* capability
+//! supported by a sub-topology `T` via blanket trait impls.
+//! 
+//! Key insight: No manual impls per T or capability -- scales effortlessly.
+//! Users can:
+//! - Write new `Topology` (impl capabilities on a struct).
+//! - Compose with `FailoverTopology` (gets capabilities if T has them).
+//! - Compile fails if capability missing (safety).
+
+use async_trait::async_trait;
+use tokio;
+
+/// Capability trait: Deploy and manage PostgreSQL.
+#[async_trait]
+pub trait PostgreSQL {
+    async fn deploy(&self, config: &PostgreSQLConfig) -> Result<String, String>;
+    async fn get_replication_certs(&self, cluster_name: &str) -> Result<ReplicationCerts, String>;
+}
+
+/// Capability trait: Deploy Docker.
+#[async_trait]
+pub trait Docker {
+    async fn deploy_docker(&self) -> Result<String, String>;
+}
+
+/// Configuration for PostgreSQL deployments.
+#[derive(Clone)]
+pub struct PostgreSQLConfig;
+
+/// Replication certificates.
+#[derive(Clone)]
+pub struct ReplicationCerts;
+
+/// Concrete topology: Kubernetes Anywhere (supports PostgreSQL).
+#[derive(Clone)]
+pub struct K8sAnywhereTopology;
+
+#[async_trait]
+impl PostgreSQL for K8sAnywhereTopology {
+    async fn deploy(&self, _config: &PostgreSQLConfig) -> Result<String, String> {
+        // Real impl: Use k8s helm chart, operator, etc.
+        Ok("K8sAnywhere PostgreSQL deployed".to_string())
+    }
+
+    async fn get_replication_certs(&self, _cluster_name: &str) -> Result<ReplicationCerts, String> {
+        Ok(ReplicationCerts)
+    }
+}
+
+/// Concrete topology: Linux Host (supports Docker).
+#[derive(Clone)]
+pub struct LinuxHostTopology;
+
+#[async_trait]
+impl Docker for LinuxHostTopology {
+    async fn deploy_docker(&self) -> Result<String, String> {
+        // Real impl: Install/configure Docker on host.
+        Ok("LinuxHost Docker deployed".to_string())
+    }
+}
+
+/// Higher-Order Topology: Composes multiple sub-topologies (primary + replica).
+/// Automatically derives *all* capabilities of `T` with failover orchestration.
+/// 
+/// - If `T: PostgreSQL`, then `FailoverTopology<T>: PostgreSQL` (blanket impl).
+/// - Same for `Docker`, etc. No boilerplate!
+/// - Compile-time safe: Missing `T: Capability` → error.
+#[derive(Clone)]
+pub struct FailoverTopology<T> {
+    /// Primary sub-topology.
+    pub primary: T,
+    /// Replica sub-topology.
+    pub replica: T,
+}
+
+/// Blanket impl: Failover PostgreSQL if T provides PostgreSQL.
+/// Delegates reads to primary; deploys to both.
+#[async_trait]
+impl<T: PostgreSQL + Send + Sync + Clone> PostgreSQL for FailoverTopology<T> {
+    async fn deploy(&self, config: &PostgreSQLConfig) -> Result<String, String> {
+        // Orchestrate: Deploy primary first, then replica (e.g., via pg_basebackup).
+        let primary_result = self.primary.deploy(config).await?;
+        let replica_result = self.replica.deploy(config).await?;
+        Ok(format!("Failover PG deployed: {} | {}", primary_result, replica_result))
+    }
+
+    async fn get_replication_certs(&self, cluster_name: &str) -> Result<ReplicationCerts, String> {
+        // Delegate to primary (replica follows).
+        self.primary.get_replication_certs(cluster_name).await
+    }
+}
+
+/// Blanket impl: Failover Docker if T provides Docker.
+#[async_trait]
+impl<T: Docker + Send + Sync + Clone> Docker for FailoverTopology<T> {
+    async fn deploy_docker(&self) -> Result<String, String> {
+        // Orchestrate across primary + replica.
+        let primary_result = self.primary.deploy_docker().await?;
+        let replica_result = self.replica.deploy_docker().await?;
+        Ok(format!("Failover Docker deployed: {} | {}", primary_result, replica_result))
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let config = PostgreSQLConfig;
+
+    println!("=== ✅ PostgreSQL Failover (K8sAnywhere supports PG) ===");
+    let pg_failover = FailoverTopology {
+        primary: K8sAnywhereTopology,
+        replica: K8sAnywhereTopology,
+    };
+    let result = pg_failover.deploy(&config).await.unwrap();
+    println!("Result: {}", result);
+
+    println!("\n=== ✅ Docker Failover (LinuxHost supports Docker) ===");
+    let docker_failover = FailoverTopology {
+        primary: LinuxHostTopology,
+        replica: LinuxHostTopology,
+    };
+    let result = docker_failover.deploy_docker().await.unwrap();
+    println!("Result: {}", result);
+
+    println!("\n=== ❌ Would fail to compile (K8sAnywhere !: Docker) ===");
+    // let invalid = FailoverTopology {
+    //     primary: K8sAnywhereTopology,
+    //     replica: K8sAnywhereTopology,
+    // };
+    // invalid.deploy_docker().await.unwrap(); // Error: `K8sAnywhereTopology: Docker` not satisfied!
+    // Very clear error message :
+    // error[E0599]: the method `deploy_docker` exists for struct `FailoverTopology<K8sAnywhereTopology>`, but its trait bounds were not satisfied
+    //   --> src/main.rs:90:9
+    //    |
+    //  4 | pub struct FailoverTopology<T> {
+    //    | ------------------------------ method `deploy_docker` not found for this struct because it doesn't satisfy `FailoverTopology<K8sAnywhereTopology>: Docker`
+    // ...
+    // 37 | struct K8sAnywhereTopology;
+    //    | -------------------------- doesn't satisfy `K8sAnywhereTopology: Docker`
+    // ...
+    // 90 | invalid.deploy_docker(); // `T: Docker` bound unsatisfied
+    //    |         ^^^^^^^^^^^^^ method cannot be called on `FailoverTopology<K8sAnywhereTopology>` due to unsatisfied trait bounds
+    //    |
+    // note: trait bound `K8sAnywhereTopology: Docker` was not satisfied
+    //   --> src/main.rs:61:9
+    //    |
+    // 61 | impl<T: Docker + Send + Sync> Docker for FailoverTopology<T> {
+    //    |         ^^^^^^                ------     -------------------
+    //    |         |
+    //    |         unsatisfied trait bound introduced here
+    // note: the trait `Docker` must be implemented
+}
+

examples/nanodc/src/main.rs

@@ -1,6 +1,6 @@
 use std::{
     net::{IpAddr, Ipv4Addr},
-    sync::Arc,
+    sync::{Arc, OnceLock},
 };
 
 use brocade::BrocadeOptions;
@@ -107,6 +107,7 @@ async fn main() {
             },
         ],
         switch_client: switch_client.clone(),
+        network_manager: OnceLock::new(),
     };
 
     let inventory = Inventory {

examples/okd_installation/src/topology.rs

@@ -9,7 +9,10 @@ use harmony::{
 use harmony_macros::{ip, ipv4};
 use harmony_secret::{Secret, SecretManager};
 use serde::{Deserialize, Serialize};
-use std::{net::IpAddr, sync::Arc};
+use std::{
+    net::IpAddr,
+    sync::{Arc, OnceLock},
+};
 
 #[derive(Secret, Serialize, Deserialize, Debug, PartialEq)]
 struct OPNSenseFirewallConfig {
@@ -81,6 +84,7 @@ pub async fn get_topology() -> HAClusterTopology {
         },
         workers: vec![],
         switch_client: switch_client.clone(),
+        network_manager: OnceLock::new(),
     }
 }
 

examples/okd_pxe/src/topology.rs

@@ -10,7 +10,10 @@ use harmony::{
 use harmony_macros::{ip, ipv4};
 use harmony_secret::{Secret, SecretManager};
 use serde::{Deserialize, Serialize};
-use std::{net::IpAddr, sync::Arc};
+use std::{
+    net::IpAddr,
+    sync::{Arc, OnceLock},
+};
 
 pub async fn get_topology() -> HAClusterTopology {
     let firewall = harmony::topology::LogicalHost {
@@ -76,6 +79,7 @@ pub async fn get_topology() -> HAClusterTopology {
         },
         workers: vec![],
         switch_client: switch_client.clone(),
+        network_manager: OnceLock::new(),
     }
 }
 

examples/opnsense/src/main.rs

@@ -1,6 +1,6 @@
 use std::{
     net::{IpAddr, Ipv4Addr},
-    sync::Arc,
+    sync::{Arc, OnceLock},
 };
 
 use brocade::BrocadeOptions;
@@ -79,6 +79,7 @@ async fn main() {
         },
         workers: vec![],
         switch_client: switch_client.clone(),
+        network_manager: OnceLock::new(),
     };
 
     let inventory = Inventory {

harmony/src/domain/topology/ha_cluster.rs

@@ -1,29 +1,25 @@
 use async_trait::async_trait;
 use harmony_macros::ip;
 use harmony_types::{
+    id::Id,
     net::{MacAddress, Url},
     switch::PortLocation,
 };
-use kube::api::ObjectMeta;
 use log::debug;
 use log::info;
 
-use crate::modules::okd::crd::nmstate::{self, NodeNetworkConfigurationPolicy};
+use crate::infra::network_manager::OpenShiftNmStateNetworkManager;
 use crate::topology::PxeOptions;
-use crate::{data::FileContent, modules::okd::crd::nmstate::NMState};
+use crate::{data::FileContent, executors::ExecutorError};
-use crate::{
-    executors::ExecutorError, modules::okd::crd::nmstate::NodeNetworkConfigurationPolicySpec,
-};
 
 use super::{
     DHCPStaticEntry, DhcpServer, DnsRecord, DnsRecordType, DnsServer, Firewall, HostNetworkConfig,
-    HttpServer, IpAddress, K8sclient, LoadBalancer, LoadBalancerService, LogicalHost,
+    HttpServer, IpAddress, K8sclient, LoadBalancer, LoadBalancerService, LogicalHost, NetworkError,
-    PreparationError, PreparationOutcome, Router, Switch, SwitchClient, SwitchError, TftpServer,
+    NetworkManager, PreparationError, PreparationOutcome, Router, Switch, SwitchClient,
-    Topology, k8s::K8sClient,
+    SwitchError, TftpServer, Topology, k8s::K8sClient,
 };
 
-use std::collections::BTreeMap;
+use std::sync::{Arc, OnceLock};
-use std::sync::Arc;
 
 #[derive(Debug, Clone)]
 pub struct HAClusterTopology {
@@ -40,6 +36,7 @@ pub struct HAClusterTopology {
     pub control_plane: Vec<LogicalHost>,
     pub workers: Vec<LogicalHost>,
     pub kubeconfig: Option<String>,
+    pub network_manager: OnceLock<Arc<dyn NetworkManager>>,
 }
 
 #[async_trait]
@@ -63,7 +60,7 @@ impl K8sclient for HAClusterTopology {
                 K8sClient::try_default().await.map_err(|e| e.to_string())?,
             )),
             Some(kubeconfig) => {
-                let Some(client) = K8sClient::from_kubeconfig(&kubeconfig).await else {
+                let Some(client) = K8sClient::from_kubeconfig(kubeconfig).await else {
                     return Err("Failed to create k8s client".to_string());
                 };
                 Ok(Arc::new(client))
@@ -93,191 +90,12 @@ impl HAClusterTopology {
             .to_string()
     }
 
-    async fn ensure_nmstate_operator_installed(&self) -> Result<(), String> {
+    pub async fn network_manager(&self) -> &dyn NetworkManager {
-        let k8s_client = self.k8s_client().await?;
+        let k8s_client = self.k8s_client().await.unwrap();
 
-        debug!("Installing NMState controller...");
+        self.network_manager
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/nmstate.io_nmstates.yaml
+            .get_or_init(|| Arc::new(OpenShiftNmStateNetworkManager::new(k8s_client.clone())))
-").unwrap(), Some("nmstate"))
+            .as_ref()
-            .await
-            .map_err(|e| e.to_string())?;
-
-        debug!("Creating NMState namespace...");
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/namespace.yaml
-").unwrap(), Some("nmstate"))
-            .await
-            .map_err(|e| e.to_string())?;
-
-        debug!("Creating NMState service account...");
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/service_account.yaml
-").unwrap(), Some("nmstate"))
-            .await
-            .map_err(|e| e.to_string())?;
-
-        debug!("Creating NMState role...");
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/role.yaml
-").unwrap(), Some("nmstate"))
-            .await
-            .map_err(|e| e.to_string())?;
-
-        debug!("Creating NMState role binding...");
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/role_binding.yaml
-").unwrap(), Some("nmstate"))
-            .await
-            .map_err(|e| e.to_string())?;
-
-        debug!("Creating NMState operator...");
-        k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/operator.yaml
-").unwrap(), Some("nmstate"))
-            .await
-            .map_err(|e| e.to_string())?;
-
-        k8s_client
-            .wait_until_deployment_ready("nmstate-operator", Some("nmstate"), None)
-            .await?;
-
-        let nmstate = NMState {
-            metadata: ObjectMeta {
-                name: Some("nmstate".to_string()),
-                ..Default::default()
-            },
-            ..Default::default()
-        };
-        debug!("Creating NMState: {nmstate:#?}");
-        k8s_client
-            .apply(&nmstate, None)
-            .await
-            .map_err(|e| e.to_string())?;
-
-        Ok(())
-    }
-
-    fn get_next_bond_id(&self) -> u8 {
-        42 // FIXME: Find a better way to declare the bond id
-    }
-
-    async fn configure_bond(&self, config: &HostNetworkConfig) -> Result<(), SwitchError> {
-        self.ensure_nmstate_operator_installed()
-            .await
-            .map_err(|e| {
-                SwitchError::new(format!(
-                    "Can't configure bond, NMState operator not available: {e}"
-                ))
-            })?;
-
-        let bond_config = self.create_bond_configuration(config);
-        debug!(
-            "Applying NMState bond config for host {}: {bond_config:#?}",
-            config.host_id
-        );
-        self.k8s_client()
-            .await
-            .unwrap()
-            .apply(&bond_config, None)
-            .await
-            .map_err(|e| SwitchError::new(format!("Failed to configure bond: {e}")))?;
-
-        Ok(())
-    }
-
-    fn create_bond_configuration(
-        &self,
-        config: &HostNetworkConfig,
-    ) -> NodeNetworkConfigurationPolicy {
-        let host_name = &config.host_id;
-        let bond_id = self.get_next_bond_id();
-        let bond_name = format!("bond{bond_id}");
-
-        info!("Configuring bond '{bond_name}' for host '{host_name}'...");
-
-        let mut bond_mtu: Option<u32> = None;
-        let mut copy_mac_from: Option<String> = None;
-        let mut bond_ports = Vec::new();
-        let mut interfaces: Vec<nmstate::InterfaceSpec> = Vec::new();
-
-        for switch_port in &config.switch_ports {
-            let interface_name = switch_port.interface.name.clone();
-
-            interfaces.push(nmstate::InterfaceSpec {
-                name: interface_name.clone(),
-                description: Some(format!("Member of bond {bond_name}")),
-                r#type: "ethernet".to_string(),
-                state: "up".to_string(),
-                mtu: Some(switch_port.interface.mtu),
-                mac_address: Some(switch_port.interface.mac_address.to_string()),
-                ipv4: Some(nmstate::IpStackSpec {
-                    enabled: Some(false),
-                    ..Default::default()
-                }),
-                ipv6: Some(nmstate::IpStackSpec {
-                    enabled: Some(false),
-                    ..Default::default()
-                }),
-                link_aggregation: None,
-                ..Default::default()
-            });
-
-            bond_ports.push(interface_name.clone());
-
-            // Use the first port's details for the bond mtu and mac address
-            if bond_mtu.is_none() {
-                bond_mtu = Some(switch_port.interface.mtu);
-            }
-            if copy_mac_from.is_none() {
-                copy_mac_from = Some(interface_name);
-            }
-        }
-
-        interfaces.push(nmstate::InterfaceSpec {
-            name: bond_name.clone(),
-            description: Some(format!("Network bond for host {host_name}")),
-            r#type: "bond".to_string(),
-            state: "up".to_string(),
-            copy_mac_from,
-            ipv4: Some(nmstate::IpStackSpec {
-                dhcp: Some(true),
-                enabled: Some(true),
-                ..Default::default()
-            }),
-            ipv6: Some(nmstate::IpStackSpec {
-                dhcp: Some(true),
-                autoconf: Some(true),
-                enabled: Some(true),
-                ..Default::default()
-            }),
-            link_aggregation: Some(nmstate::BondSpec {
-                mode: "802.3ad".to_string(),
-                ports: bond_ports,
-                ..Default::default()
-            }),
-            ..Default::default()
-        });
-
-        NodeNetworkConfigurationPolicy {
-            metadata: ObjectMeta {
-                name: Some(format!("{host_name}-bond-config")),
-                ..Default::default()
-            },
-            spec: NodeNetworkConfigurationPolicySpec {
-                node_selector: Some(BTreeMap::from([(
-                    "kubernetes.io/hostname".to_string(),
-                    host_name.to_string(),
-                )])),
-                desired_state: nmstate::DesiredStateSpec { interfaces },
-            },
-        }
-    }
-
-    async fn configure_port_channel(&self, config: &HostNetworkConfig) -> Result<(), SwitchError> {
-        debug!("Configuring port channel: {config:#?}");
-        let switch_ports = config.switch_ports.iter().map(|s| s.port.clone()).collect();
-
-        self.switch_client
-            .configure_port_channel(&format!("Harmony_{}", config.host_id), switch_ports)
-            .await
-            .map_err(|e| SwitchError::new(format!("Failed to configure switch: {e}")))?;
-
-        Ok(())
     }
 
     pub fn autoload() -> Self {
@@ -301,6 +119,7 @@ impl HAClusterTopology {
             bootstrap_host: dummy_host,
             control_plane: vec![],
             workers: vec![],
+            network_manager: OnceLock::new(),
         }
     }
 }
@@ -458,21 +277,40 @@ impl HttpServer for HAClusterTopology {
 #[async_trait]
 impl Switch for HAClusterTopology {
     async fn setup_switch(&self) -> Result<(), SwitchError> {
-        self.switch_client.setup().await?;
+        self.switch_client.setup().await.map(|_| ())
-        Ok(())
     }
 
     async fn get_port_for_mac_address(
         &self,
         mac_address: &MacAddress,
     ) -> Result<Option<PortLocation>, SwitchError> {
-        let port = self.switch_client.find_port(mac_address).await?;
+        self.switch_client.find_port(mac_address).await
-        Ok(port)
     }
 
-    async fn configure_host_network(&self, config: &HostNetworkConfig) -> Result<(), SwitchError> {
+    async fn configure_port_channel(&self, config: &HostNetworkConfig) -> Result<(), SwitchError> {
-        self.configure_bond(config).await?;
+        debug!("Configuring port channel: {config:#?}");
-        self.configure_port_channel(config).await
+        let switch_ports = config.switch_ports.iter().map(|s| s.port.clone()).collect();
+
+        self.switch_client
+            .configure_port_channel(&format!("Harmony_{}", config.host_id), switch_ports)
+            .await
+            .map_err(|e| SwitchError::new(format!("Failed to configure port-channel: {e}")))?;
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl NetworkManager for HAClusterTopology {
+    async fn ensure_network_manager_installed(&self) -> Result<(), NetworkError> {
+        self.network_manager()
+            .await
+            .ensure_network_manager_installed()
+            .await
+    }
+
+    async fn configure_bond(&self, config: &HostNetworkConfig) -> Result<(), NetworkError> {
+        self.network_manager().await.configure_bond(config).await
     }
 }
 

harmony/src/domain/topology/k8s.rs

@@ -5,13 +5,15 @@ use k8s_openapi::{
     ClusterResourceScope, NamespaceResourceScope,
     api::{
         apps::v1::Deployment,
-        core::v1::{Pod, ServiceAccount},
+        core::v1::{Node, Pod, ServiceAccount},
     },
     apimachinery::pkg::version::Info,
 };
 use kube::{
     Client, Config, Discovery, Error, Resource,
-    api::{Api, AttachParams, DeleteParams, ListParams, Patch, PatchParams, ResourceExt},
+    api::{
+        Api, AttachParams, DeleteParams, ListParams, ObjectList, Patch, PatchParams, ResourceExt,
+    },
     config::{KubeConfigOptions, Kubeconfig},
     core::ErrorResponse,
     discovery::{ApiCapabilities, Scope},
@@ -23,7 +25,7 @@ use kube::{
     api::{ApiResource, GroupVersionKind},
     runtime::wait::await_condition,
 };
-use log::{debug, error, info, trace, warn};
+use log::{debug, error, trace, warn};
 use serde::{Serialize, de::DeserializeOwned};
 use serde_json::json;
 use similar::TextDiff;
@@ -564,7 +566,58 @@ impl K8sClient {
         Ok(())
     }
 
-    pub(crate) async fn from_kubeconfig(path: &str) -> Option<K8sClient> {
+    /// Gets a single named resource of a specific type `K`.
+    ///
+    /// This function uses the `ApplyStrategy` trait to correctly determine
+    /// whether to look in a specific namespace or in the entire cluster.
+    ///
+    /// Returns `Ok(None)` if the resource is not found (404).
+    pub async fn get_resource<K>(
+        &self,
+        name: &str,
+        namespace: Option<&str>,
+    ) -> Result<Option<K>, Error>
+    where
+        K: Resource + Clone + std::fmt::Debug + DeserializeOwned,
+        <K as Resource>::Scope: ApplyStrategy<K>,
+        <K as kube::Resource>::DynamicType: Default,
+    {
+        let api: Api<K> =
+            <<K as Resource>::Scope as ApplyStrategy<K>>::get_api(&self.client, namespace);
+
+        api.get_opt(name).await
+    }
+
+    /// Lists all resources of a specific type `K`.
+    ///
+    /// This function uses the `ApplyStrategy` trait to correctly determine
+    /// whether to list from a specific namespace or from the entire cluster.
+    pub async fn list_resources<K>(
+        &self,
+        namespace: Option<&str>,
+        list_params: Option<ListParams>,
+    ) -> Result<ObjectList<K>, Error>
+    where
+        K: Resource + Clone + std::fmt::Debug + DeserializeOwned,
+        <K as Resource>::Scope: ApplyStrategy<K>,
+        <K as kube::Resource>::DynamicType: Default,
+    {
+        let api: Api<K> =
+            <<K as Resource>::Scope as ApplyStrategy<K>>::get_api(&self.client, namespace);
+
+        let list_params = list_params.unwrap_or_default();
+        api.list(&list_params).await
+    }
+
+    /// Fetches a list of all Nodes in the cluster.
+    pub async fn get_nodes(
+        &self,
+        list_params: Option<ListParams>,
+    ) -> Result<ObjectList<Node>, Error> {
+        self.list_resources(None, list_params).await
+    }
+
+    pub async fn from_kubeconfig(path: &str) -> Option<K8sClient> {
         let k = match Kubeconfig::read_from(path) {
             Ok(k) => k,
             Err(e) => {

harmony/src/domain/topology/network.rs

@@ -15,7 +15,7 @@ use harmony_types::{
 };
 use serde::Serialize;
 
-use crate::{executors::ExecutorError, hardware::PhysicalHost};
+use crate::executors::ExecutorError;
 
 use super::{LogicalHost, k8s::K8sClient};
 
@@ -183,6 +183,37 @@ impl FromStr for DnsRecordType {
     }
 }
 
+#[async_trait]
+pub trait NetworkManager: Debug + Send + Sync {
+    async fn ensure_network_manager_installed(&self) -> Result<(), NetworkError>;
+    async fn configure_bond(&self, config: &HostNetworkConfig) -> Result<(), NetworkError>;
+}
+
+#[derive(Debug, Clone, new)]
+pub struct NetworkError {
+    msg: String,
+}
+
+impl fmt::Display for NetworkError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.msg)
+    }
+}
+
+impl Error for NetworkError {}
+
+impl From<kube::Error> for NetworkError {
+    fn from(value: kube::Error) -> Self {
+        NetworkError::new(value.to_string())
+    }
+}
+
+impl From<String> for NetworkError {
+    fn from(value: String) -> Self {
+        NetworkError::new(value)
+    }
+}
+
 #[async_trait]
 pub trait Switch: Send + Sync {
     async fn setup_switch(&self) -> Result<(), SwitchError>;
@@ -192,7 +223,7 @@ pub trait Switch: Send + Sync {
         mac_address: &MacAddress,
     ) -> Result<Option<PortLocation>, SwitchError>;
 
-    async fn configure_host_network(&self, config: &HostNetworkConfig) -> Result<(), SwitchError>;
+    async fn configure_port_channel(&self, config: &HostNetworkConfig) -> Result<(), SwitchError>;
 }
 
 #[derive(Clone, Debug, PartialEq)]

harmony/src/infra/mod.rs

@@ -4,5 +4,6 @@ pub mod hp_ilo;
 pub mod intel_amt;
 pub mod inventory;
 pub mod kube;
+pub mod network_manager;
 pub mod opnsense;
 mod sqlx;

harmony/src/infra/network_manager.rs

@@ -0,0 +1,257 @@
+use std::{
+    collections::{BTreeMap, HashSet},
+    sync::Arc,
+};
+
+use async_trait::async_trait;
+use harmony_types::id::Id;
+use k8s_openapi::api::core::v1::Node;
+use kube::{
+    ResourceExt,
+    api::{ObjectList, ObjectMeta},
+};
+use log::{debug, info};
+
+use crate::{
+    modules::okd::crd::nmstate,
+    topology::{HostNetworkConfig, NetworkError, NetworkManager, k8s::K8sClient},
+};
+
+pub struct OpenShiftNmStateNetworkManager {
+    k8s_client: Arc<K8sClient>,
+}
+
+impl std::fmt::Debug for OpenShiftNmStateNetworkManager {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("OpenShiftNmStateNetworkManager").finish()
+    }
+}
+
+#[async_trait]
+impl NetworkManager for OpenShiftNmStateNetworkManager {
+    async fn ensure_network_manager_installed(&self) -> Result<(), NetworkError> {
+        debug!("Installing NMState controller...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/nmstate.io_nmstates.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        debug!("Creating NMState namespace...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/namespace.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        debug!("Creating NMState service account...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/service_account.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        debug!("Creating NMState role...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/role.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        debug!("Creating NMState role binding...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/role_binding.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        debug!("Creating NMState operator...");
+        self.k8s_client.apply_url(url::Url::parse("https://github.com/nmstate/kubernetes-nmstate/releases/download/v0.84.0/operator.yaml
+").unwrap(), Some("nmstate"))
+            .await?;
+
+        self.k8s_client
+            .wait_until_deployment_ready("nmstate-operator", Some("nmstate"), None)
+            .await?;
+
+        let nmstate = nmstate::NMState {
+            metadata: ObjectMeta {
+                name: Some("nmstate".to_string()),
+                ..Default::default()
+            },
+            ..Default::default()
+        };
+        debug!(
+            "Creating NMState:\n{}",
+            serde_yaml::to_string(&nmstate).unwrap()
+        );
+        self.k8s_client.apply(&nmstate, None).await?;
+
+        Ok(())
+    }
+
+    async fn configure_bond(&self, config: &HostNetworkConfig) -> Result<(), NetworkError> {
+        let hostname = self.get_hostname(&config.host_id).await.map_err(|e| {
+            NetworkError::new(format!(
+                "Can't configure bond, can't get hostname for host '{}': {e}",
+                config.host_id
+            ))
+        })?;
+        let bond_id = self.get_next_bond_id(&hostname).await.map_err(|e| {
+            NetworkError::new(format!(
+                "Can't configure bond, can't get an available bond id for host '{}': {e}",
+                config.host_id
+            ))
+        })?;
+        let bond_config = self.create_bond_configuration(&hostname, &bond_id, config);
+
+        debug!(
+            "Applying NMState bond config for host {}:\n{}",
+            config.host_id,
+            serde_yaml::to_string(&bond_config).unwrap(),
+        );
+        self.k8s_client
+            .apply(&bond_config, None)
+            .await
+            .map_err(|e| NetworkError::new(format!("Failed to configure bond: {e}")))?;
+
+        Ok(())
+    }
+}
+
+impl OpenShiftNmStateNetworkManager {
+    pub fn new(k8s_client: Arc<K8sClient>) -> Self {
+        Self { k8s_client }
+    }
+
+    fn create_bond_configuration(
+        &self,
+        host: &str,
+        bond_name: &str,
+        config: &HostNetworkConfig,
+    ) -> nmstate::NodeNetworkConfigurationPolicy {
+        info!("Configuring bond '{bond_name}' for host '{host}'...");
+
+        let mut bond_mtu: Option<u32> = None;
+        let mut copy_mac_from: Option<String> = None;
+        let mut bond_ports = Vec::new();
+        let mut interfaces: Vec<nmstate::Interface> = Vec::new();
+
+        for switch_port in &config.switch_ports {
+            let interface_name = switch_port.interface.name.clone();
+
+            interfaces.push(nmstate::Interface {
+                name: interface_name.clone(),
+                description: Some(format!("Member of bond {bond_name}")),
+                r#type: nmstate::InterfaceType::Ethernet,
+                state: "up".to_string(),
+                ipv4: Some(nmstate::IpStackSpec {
+                    enabled: Some(false),
+                    ..Default::default()
+                }),
+                ipv6: Some(nmstate::IpStackSpec {
+                    enabled: Some(false),
+                    ..Default::default()
+                }),
+                link_aggregation: None,
+                ..Default::default()
+            });
+
+            bond_ports.push(interface_name.clone());
+
+            // Use the first port's details for the bond mtu and mac address
+            if bond_mtu.is_none() {
+                bond_mtu = Some(switch_port.interface.mtu);
+            }
+            if copy_mac_from.is_none() {
+                copy_mac_from = Some(interface_name);
+            }
+        }
+
+        interfaces.push(nmstate::Interface {
+            name: bond_name.to_string(),
+            description: Some(format!("HARMONY - Network bond for host {host}")),
+            r#type: nmstate::InterfaceType::Bond,
+            state: "up".to_string(),
+            copy_mac_from,
+            ipv4: Some(nmstate::IpStackSpec {
+                dhcp: Some(true),
+                enabled: Some(true),
+                ..Default::default()
+            }),
+            ipv6: Some(nmstate::IpStackSpec {
+                dhcp: Some(true),
+                autoconf: Some(true),
+                enabled: Some(true),
+                ..Default::default()
+            }),
+            link_aggregation: Some(nmstate::BondSpec {
+                mode: "802.3ad".to_string(),
+                ports: bond_ports,
+                ..Default::default()
+            }),
+            ..Default::default()
+        });
+
+        nmstate::NodeNetworkConfigurationPolicy {
+            metadata: ObjectMeta {
+                name: Some(format!("{host}-bond-config")),
+                ..Default::default()
+            },
+            spec: nmstate::NodeNetworkConfigurationPolicySpec {
+                node_selector: Some(BTreeMap::from([(
+                    "kubernetes.io/hostname".to_string(),
+                    host.to_string(),
+                )])),
+                desired_state: nmstate::NetworkState {
+                    interfaces,
+                    ..Default::default()
+                },
+            },
+        }
+    }
+
+    async fn get_hostname(&self, host_id: &Id) -> Result<String, String> {
+        let nodes: ObjectList<Node> = self
+            .k8s_client
+            .list_resources(None, None)
+            .await
+            .map_err(|e| format!("Failed to list nodes: {e}"))?;
+
+        let Some(node) = nodes.iter().find(|n| {
+            n.status
+                .as_ref()
+                .and_then(|s| s.node_info.as_ref())
+                .map(|i| i.system_uuid == host_id.to_string())
+                .unwrap_or(false)
+        }) else {
+            return Err(format!("No node found for host '{host_id}'"));
+        };
+
+        node.labels()
+            .get("kubernetes.io/hostname")
+            .ok_or(format!(
+                "Node '{host_id}' has no kubernetes.io/hostname label"
+            ))
+            .cloned()
+    }
+
+    async fn get_next_bond_id(&self, hostname: &str) -> Result<String, String> {
+        let network_state: Option<nmstate::NodeNetworkState> = self
+            .k8s_client
+            .get_resource(hostname, None)
+            .await
+            .map_err(|e| format!("Failed to list nodes: {e}"))?;
+
+        let interfaces = vec![];
+        let existing_bonds: Vec<&nmstate::Interface> = network_state
+            .as_ref()
+            .and_then(|network_state| network_state.status.current_state.as_ref())
+            .map_or(&interfaces, |current_state| &current_state.interfaces)
+            .iter()
+            .filter(|i| i.r#type == nmstate::InterfaceType::Bond)
+            .collect();
+
+        let used_ids: HashSet<u32> = existing_bonds
+            .iter()
+            .filter_map(|i| {
+                i.name
+                    .strip_prefix("bond")
+                    .and_then(|id| id.parse::<u32>().ok())
+            })
+            .collect();
+
+        let next_id = (0..).find(|id| !used_ids.contains(id)).unwrap();
+        Ok(format!("bond{next_id}"))
+    }
+}

harmony/src/modules/inventory/discovery.rs

@@ -74,7 +74,11 @@ impl<T: Topology> Interpret<T> for DiscoverHostForRoleInterpret {
 
             match ans {
                 Ok(choice) => {
-                    info!("Selected {} as the bootstrap node.", choice.summary());
+                    info!(
+                        "Selected {} as the {:?} node.",
+                        choice.summary(),
+                        self.score.role
+                    );
                     host_repo
                         .save_role_mapping(&self.score.role, &choice)
                         .await?;
@@ -90,10 +94,7 @@ impl<T: Topology> Interpret<T> for DiscoverHostForRoleInterpret {
                         "Failed to select node for role {:?} : {}",
                         self.score.role, e
                     );
-                    return Err(InterpretError::new(format!(
+                    return Err(InterpretError::new(format!("Could not select host : {e}")));
-                        "Could not select host : {}",
-                        e.to_string()
-                    )));
                 }
             }
         }

harmony/src/modules/okd/crd/nmstate.rs

@@ -1,6 +1,7 @@
 use std::collections::BTreeMap;
 
-use kube::CustomResource;
+use k8s_openapi::{ClusterResourceScope, Resource};
+use kube::{CustomResource, api::ObjectMeta};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
@@ -47,28 +48,223 @@ pub struct ProbeDns {
     group = "nmstate.io",
     version = "v1",
     kind = "NodeNetworkConfigurationPolicy",
-    namespaced
+    namespaced = false
 )]
 #[serde(rename_all = "camelCase")]
 pub struct NodeNetworkConfigurationPolicySpec {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub node_selector: Option<BTreeMap<String, String>>,
-    pub desired_state: DesiredStateSpec,
+    pub desired_state: NetworkState,
+}
+
+// Currently, kube-rs derive doesn't support resources without a `spec` field, so we have
+// to implement it ourselves.
+//
+// Ref:
+// - https://github.com/kube-rs/kube/issues/1763
+// - https://github.com/kube-rs/kube/discussions/1762
+#[derive(Deserialize, Serialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct NodeNetworkState {
+    metadata: ObjectMeta,
+    pub status: NodeNetworkStateStatus,
+}
+
+impl Resource for NodeNetworkState {
+    const API_VERSION: &'static str = "nmstate.io/v1beta1";
+    const GROUP: &'static str = "nmstate.io";
+    const VERSION: &'static str = "v1beta1";
+    const KIND: &'static str = "NodeNetworkState";
+    const URL_PATH_SEGMENT: &'static str = "nodenetworkstates";
+    type Scope = ClusterResourceScope;
+}
+
+impl k8s_openapi::Metadata for NodeNetworkState {
+    type Ty = ObjectMeta;
+
+    fn metadata(&self) -> &Self::Ty {
+        &self.metadata
+    }
+
+    fn metadata_mut(&mut self) -> &mut Self::Ty {
+        &mut self.metadata
+    }
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct NodeNetworkStateStatus {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub current_state: Option<NetworkState>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub handler_nmstate_version: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub host_network_manager_version: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub last_successful_update_time: Option<String>,
+}
+
+/// The NetworkState is the top-level struct, representing the entire
+/// desired or current network state.
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
 #[serde(rename_all = "kebab-case")]
-pub struct DesiredStateSpec {
+#[serde(deny_unknown_fields)]
-    pub interfaces: Vec<InterfaceSpec>,
+pub struct NetworkState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hostname: Option<HostNameState>,
+    #[serde(rename = "dns-resolver", skip_serializing_if = "Option::is_none")]
+    pub dns: Option<DnsState>,
+    #[serde(rename = "route-rules", skip_serializing_if = "Option::is_none")]
+    pub rules: Option<RouteRuleState>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub routes: Option<RouteState>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub interfaces: Vec<Interface>,
+    #[serde(rename = "ovs-db", skip_serializing_if = "Option::is_none")]
+    pub ovsdb: Option<OvsDbGlobalConfig>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ovn: Option<OvnConfiguration>,
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
 #[serde(rename_all = "kebab-case")]
-pub struct InterfaceSpec {
+pub struct HostNameState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub running: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub config: Option<String>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct DnsState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub running: Option<DnsResolverConfig>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub config: Option<DnsResolverConfig>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct DnsResolverConfig {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub search: Option<Vec<String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub server: Option<Vec<String>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct RouteRuleState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub config: Option<Vec<RouteRule>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub running: Option<Vec<RouteRule>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct RouteState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub config: Option<Vec<Route>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub running: Option<Vec<Route>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct RouteRule {
+    #[serde(rename = "ip-from", skip_serializing_if = "Option::is_none")]
+    pub ip_from: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub priority: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub route_table: Option<u32>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct Route {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub destination: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub metric: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub next_hop_address: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub next_hop_interface: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub table_id: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub mtu: Option<u32>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct OvsDbGlobalConfig {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub external_ids: Option<BTreeMap<String, String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub other_config: Option<BTreeMap<String, String>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct OvnConfiguration {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub bridge_mappings: Option<Vec<OvnBridgeMapping>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct OvnBridgeMapping {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub localnet: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub bridge: Option<String>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, JsonSchema)]
+#[serde(untagged)]
+#[serde(rename_all = "kebab-case")]
+pub enum StpSpec {
+    Bool(bool),
+    Options(StpOptions),
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct LldpState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub enabled: Option<bool>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct OvsDb {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub external_ids: Option<BTreeMap<String, String>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub other_config: Option<BTreeMap<String, String>>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct PatchState {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub peer: Option<String>,
+}
+
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub struct Interface {
     pub name: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
-    pub r#type: String,
+    pub r#type: InterfaceType,
     pub state: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub mac_address: Option<String>,
@@ -99,9 +295,81 @@ pub struct InterfaceSpec {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub linux_bridge: Option<LinuxBridgeSpec>,
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(alias = "bridge")]
     pub ovs_bridge: Option<OvsBridgeSpec>,
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub ethtool: Option<EthtoolSpec>,
+    pub ethtool: Option<Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub accept_all_mac_addresses: Option<bool>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub identifier: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub lldp: Option<LldpState>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub permanent_mac_address: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub max_mtu: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub min_mtu: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub mptcp: Option<Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub profile_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub wait_ip: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ovs_db: Option<OvsDb>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub driver: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub patch: Option<PatchState>,
+}
+
+#[derive(Deserialize, Serialize, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, JsonSchema)]
+#[serde(rename_all = "kebab-case")]
+pub enum InterfaceType {
+    #[serde(rename = "unknown")]
+    Unknown,
+    #[serde(rename = "dummy")]
+    Dummy,
+    #[serde(rename = "loopback")]
+    Loopback,
+    #[serde(rename = "linux-bridge")]
+    LinuxBridge,
+    #[serde(rename = "ovs-bridge")]
+    OvsBridge,
+    #[serde(rename = "ovs-interface")]
+    OvsInterface,
+    #[serde(rename = "bond")]
+    Bond,
+    #[serde(rename = "ipvlan")]
+    IpVlan,
+    #[serde(rename = "vlan")]
+    Vlan,
+    #[serde(rename = "vxlan")]
+    Vxlan,
+    #[serde(rename = "mac-vlan")]
+    Macvlan,
+    #[serde(rename = "mac-vtap")]
+    Macvtap,
+    #[serde(rename = "ethernet")]
+    Ethernet,
+    #[serde(rename = "infiniband")]
+    Infiniband,
+    #[serde(rename = "vrf")]
+    Vrf,
+    #[serde(rename = "veth")]
+    Veth,
+    #[serde(rename = "ipsec")]
+    Ipsec,
+    #[serde(rename = "hsr")]
+    Hrs,
+}
+
+impl Default for InterfaceType {
+    fn default() -> Self {
+        Self::Loopback
+    }
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
@@ -149,6 +417,7 @@ pub struct EthernetSpec {
 #[serde(rename_all = "kebab-case")]
 pub struct BondSpec {
     pub mode: String,
+    #[serde(alias = "port")]
     pub ports: Vec<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub options: Option<BTreeMap<String, Value>>,
@@ -287,11 +556,15 @@ pub struct OvsBridgeSpec {
 #[serde(rename_all = "kebab-case")]
 pub struct OvsBridgeOptions {
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub stp: Option<bool>,
+    pub stp: Option<StpSpec>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub rstp: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub mcast_snooping_enable: Option<bool>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub datapath: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub fail_mode: Option<String>,
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
@@ -305,18 +578,3 @@ pub struct OvsPortSpec {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub r#type: Option<String>,
 }
-
-#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
-#[serde(rename_all = "kebab-case")]
-pub struct EthtoolSpec {
-    // TODO: Properly describe this spec (https://nmstate.io/devel/yaml_api.html#ethtool)
-}
-
-#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
-#[serde(rename_all = "kebab-case")]
-pub struct EthtoolFecSpec {
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub auto: Option<bool>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub mode: Option<String>,
-}

harmony/src/modules/okd/host_network.rs

@@ -1,6 +1,6 @@
 use async_trait::async_trait;
 use harmony_types::id::Id;
-use log::{debug, info};
+use log::{info, warn};
 use serde::Serialize;
 
 use crate::{
@@ -9,7 +9,7 @@ use crate::{
     interpret::{Interpret, InterpretError, InterpretName, InterpretStatus, Outcome},
     inventory::Inventory,
     score::Score,
-    topology::{HostNetworkConfig, NetworkInterface, Switch, SwitchPort, Topology},
+    topology::{HostNetworkConfig, NetworkInterface, NetworkManager, Switch, SwitchPort, Topology},
 };
 
 #[derive(Debug, Clone, Serialize)]
@@ -17,7 +17,7 @@ pub struct HostNetworkConfigurationScore {
     pub hosts: Vec<PhysicalHost>,
 }
 
-impl<T: Topology + Switch> Score<T> for HostNetworkConfigurationScore {
+impl<T: Topology + NetworkManager + Switch> Score<T> for HostNetworkConfigurationScore {
     fn name(&self) -> String {
         "HostNetworkConfigurationScore".into()
     }
@@ -35,7 +35,7 @@ pub struct HostNetworkConfigurationInterpret {
 }
 
 impl HostNetworkConfigurationInterpret {
-    async fn configure_network_for_host<T: Topology + Switch>(
+    async fn configure_network_for_host<T: Topology + NetworkManager + Switch>(
         &self,
         topology: &T,
         host: &PhysicalHost,
@@ -49,6 +49,13 @@ impl HostNetworkConfigurationInterpret {
                 switch_ports: vec![],
             });
         }
+        if host.network.len() == 1 {
+            info!("[Host {current_host}/{total_hosts}] Only one interface to configure, skipping");
+            return Ok(HostNetworkConfig {
+                host_id: host.id.clone(),
+                switch_ports: vec![],
+            });
+        }
 
         let switch_ports = self
             .collect_switch_ports_for_host(topology, host, current_host, total_hosts)
@@ -59,7 +66,7 @@ impl HostNetworkConfigurationInterpret {
             switch_ports,
         };
 
-        if !config.switch_ports.is_empty() {
+        if config.switch_ports.len() > 1 {
             info!(
                 "[Host {current_host}/{total_hosts}] Found {} ports for {} interfaces",
                 config.switch_ports.len(),
@@ -67,15 +74,25 @@ impl HostNetworkConfigurationInterpret {
             );
 
             info!("[Host {current_host}/{total_hosts}] Configuring host network...");
+            topology.configure_bond(&config).await.map_err(|e| {
+                InterpretError::new(format!("Failed to configure host network: {e}"))
+            })?;
             topology
-                .configure_host_network(&config)
+                .configure_port_channel(&config)
                 .await
-                .map_err(|e| InterpretError::new(format!("Failed to configure host: {e}")))?;
+                .map_err(|e| {
-        } else {
+                    InterpretError::new(format!("Failed to configure host network: {e}"))
+                })?;
+        } else if config.switch_ports.is_empty() {
             info!(
                 "[Host {current_host}/{total_hosts}] No ports found for {} interfaces, skipping",
                 host.network.len()
             );
+        } else {
+            warn!(
+                "[Host {current_host}/{total_hosts}] Found a single port for {} interfaces, skipping",
+                host.network.len()
+            );
         }
 
         Ok(config)
@@ -113,7 +130,7 @@ impl HostNetworkConfigurationInterpret {
                         port,
                     });
                 }
-                Ok(None) => debug!("No port found for '{mac_address}', skipping"),
+                Ok(None) => {}
                 Err(e) => {
                     return Err(InterpretError::new(format!(
                         "Failed to get port for host '{}': {}",
@@ -133,15 +150,6 @@ impl HostNetworkConfigurationInterpret {
         ];
 
         for config in configs {
-            let host = self
-                .score
-                .hosts
-                .iter()
-                .find(|h| h.id == config.host_id)
-                .unwrap();
-
-            println!("[Host] {host}");
-
             if config.switch_ports.is_empty() {
                 report.push(format!(
                     "⏭️ Host {}: SKIPPED (No matching switch ports found)",
@@ -169,7 +177,7 @@ impl HostNetworkConfigurationInterpret {
 }
 
 #[async_trait]
-impl<T: Topology + Switch> Interpret<T> for HostNetworkConfigurationInterpret {
+impl<T: Topology + NetworkManager + Switch> Interpret<T> for HostNetworkConfigurationInterpret {
     fn get_name(&self) -> InterpretName {
         InterpretName::Custom("HostNetworkConfigurationInterpret")
     }
@@ -198,6 +206,12 @@ impl<T: Topology + Switch> Interpret<T> for HostNetworkConfigurationInterpret {
         let host_count = self.score.hosts.len();
         info!("Started network configuration for {host_count} host(s)...",);
 
+        info!("Setting up NetworkManager...",);
+        topology
+            .ensure_network_manager_installed()
+            .await
+            .map_err(|e| InterpretError::new(format!("NetworkManager setup failed: {e}")))?;
+
         info!("Setting up switch with sane defaults...");
         topology
             .setup_switch()
@@ -216,6 +230,7 @@ impl<T: Topology + Switch> Interpret<T> for HostNetworkConfigurationInterpret {
             host_configurations.push(host_configuration);
             current_host += 1;
         }
+
         if current_host > 1 {
             let details = self.format_host_configuration(host_configurations);
 
@@ -242,7 +257,8 @@ mod tests {
     use crate::{
         hardware::HostCategory,
         topology::{
-            HostNetworkConfig, PreparationError, PreparationOutcome, SwitchError, SwitchPort,
+            HostNetworkConfig, NetworkError, PreparationError, PreparationOutcome, SwitchError,
+            SwitchPort,
         },
     };
     use std::{
@@ -267,6 +283,18 @@ mod tests {
             speed_mbps: None,
             mtu: 1,
         };
+        pub static ref YET_ANOTHER_EXISTING_INTERFACE: NetworkInterface = NetworkInterface {
+            mac_address: MacAddress::try_from("AA:BB:CC:DD:EE:F3".to_string()).unwrap(),
+            name: "interface-3".into(),
+            speed_mbps: None,
+            mtu: 1,
+        };
+        pub static ref LAST_EXISTING_INTERFACE: NetworkInterface = NetworkInterface {
+            mac_address: MacAddress::try_from("AA:BB:CC:DD:EE:F4".to_string()).unwrap(),
+            name: "interface-4".into(),
+            speed_mbps: None,
+            mtu: 1,
+        };
         pub static ref UNKNOWN_INTERFACE: NetworkInterface = NetworkInterface {
             mac_address: MacAddress::try_from("11:22:33:44:55:61".to_string()).unwrap(),
             name: "unknown-interface".into(),
@@ -275,6 +303,8 @@ mod tests {
         };
         pub static ref PORT: PortLocation = PortLocation(1, 0, 42);
         pub static ref ANOTHER_PORT: PortLocation = PortLocation(2, 0, 42);
+        pub static ref YET_ANOTHER_PORT: PortLocation = PortLocation(1, 0, 45);
+        pub static ref LAST_PORT: PortLocation = PortLocation(2, 0, 45);
     }
 
     #[tokio::test]
@@ -290,28 +320,33 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn host_with_one_mac_address_should_create_bond_with_one_interface() {
+    async fn should_setup_network_manager() {
         let host = given_host(&HOST_ID, vec![EXISTING_INTERFACE.clone()]);
         let score = given_score(vec![host]);
         let topology = TopologyWithSwitch::new();
 
         let _ = score.interpret(&Inventory::empty(), &topology).await;
 
-        let configured_host_networks = topology.configured_host_networks.lock().unwrap();
+        let network_manager_setup = topology.network_manager_setup.lock().unwrap();
-        assert_that!(*configured_host_networks).contains_exactly(vec![(
+        assert_that!(*network_manager_setup).is_true();
-            HOST_ID.clone(),
-            HostNetworkConfig {
-                host_id: HOST_ID.clone(),
-                switch_ports: vec![SwitchPort {
-                    interface: EXISTING_INTERFACE.clone(),
-                    port: PORT.clone(),
-                }],
-            },
-        )]);
     }
 
     #[tokio::test]
-    async fn host_with_multiple_mac_addresses_should_create_one_bond_with_all_interfaces() {
+    async fn host_with_one_mac_address_should_skip_host_configuration() {
+        let host = given_host(&HOST_ID, vec![EXISTING_INTERFACE.clone()]);
+        let score = given_score(vec![host]);
+        let topology = TopologyWithSwitch::new();
+
+        let _ = score.interpret(&Inventory::empty(), &topology).await;
+
+        let config = topology.configured_bonds.lock().unwrap();
+        assert_that!(*config).is_empty();
+        let config = topology.configured_port_channels.lock().unwrap();
+        assert_that!(*config).is_empty();
+    }
+
+    #[tokio::test]
+    async fn host_with_multiple_mac_addresses_should_configure_one_bond_with_all_interfaces() {
         let score = given_score(vec![given_host(
             &HOST_ID,
             vec![
@@ -323,8 +358,8 @@ mod tests {
 
         let _ = score.interpret(&Inventory::empty(), &topology).await;
 
-        let configured_host_networks = topology.configured_host_networks.lock().unwrap();
+        let config = topology.configured_bonds.lock().unwrap();
-        assert_that!(*configured_host_networks).contains_exactly(vec![(
+        assert_that!(*config).contains_exactly(vec![(
             HOST_ID.clone(),
             HostNetworkConfig {
                 host_id: HOST_ID.clone(),
@@ -343,49 +378,183 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn multiple_hosts_should_create_one_bond_per_host() {
+    async fn host_with_multiple_mac_addresses_should_configure_one_port_channel_with_all_interfaces()
+     {
+        let score = given_score(vec![given_host(
+            &HOST_ID,
+            vec![
+                EXISTING_INTERFACE.clone(),
+                ANOTHER_EXISTING_INTERFACE.clone(),
+            ],
+        )]);
+        let topology = TopologyWithSwitch::new();
+
+        let _ = score.interpret(&Inventory::empty(), &topology).await;
+
+        let config = topology.configured_port_channels.lock().unwrap();
+        assert_that!(*config).contains_exactly(vec![(
+            HOST_ID.clone(),
+            HostNetworkConfig {
+                host_id: HOST_ID.clone(),
+                switch_ports: vec![
+                    SwitchPort {
+                        interface: EXISTING_INTERFACE.clone(),
+                        port: PORT.clone(),
+                    },
+                    SwitchPort {
+                        interface: ANOTHER_EXISTING_INTERFACE.clone(),
+                        port: ANOTHER_PORT.clone(),
+                    },
+                ],
+            },
+        )]);
+    }
+
+    #[tokio::test]
+    async fn multiple_hosts_should_configure_one_bond_per_host() {
         let score = given_score(vec![
-            given_host(&HOST_ID, vec![EXISTING_INTERFACE.clone()]),
+            given_host(
-            given_host(&ANOTHER_HOST_ID, vec![ANOTHER_EXISTING_INTERFACE.clone()]),
+                &HOST_ID,
+                vec![
+                    EXISTING_INTERFACE.clone(),
+                    ANOTHER_EXISTING_INTERFACE.clone(),
+                ],
+            ),
+            given_host(
+                &ANOTHER_HOST_ID,
+                vec![
+                    YET_ANOTHER_EXISTING_INTERFACE.clone(),
+                    LAST_EXISTING_INTERFACE.clone(),
+                ],
+            ),
         ]);
         let topology = TopologyWithSwitch::new();
 
         let _ = score.interpret(&Inventory::empty(), &topology).await;
 
-        let configured_host_networks = topology.configured_host_networks.lock().unwrap();
+        let config = topology.configured_bonds.lock().unwrap();
-        assert_that!(*configured_host_networks).contains_exactly(vec![
+        assert_that!(*config).contains_exactly(vec![
             (
                 HOST_ID.clone(),
                 HostNetworkConfig {
                     host_id: HOST_ID.clone(),
-                    switch_ports: vec![SwitchPort {
+                    switch_ports: vec![
+                        SwitchPort {
                             interface: EXISTING_INTERFACE.clone(),
                             port: PORT.clone(),
-                    }],
+                        },
+                        SwitchPort {
+                            interface: ANOTHER_EXISTING_INTERFACE.clone(),
+                            port: ANOTHER_PORT.clone(),
+                        },
+                    ],
                 },
             ),
             (
                 ANOTHER_HOST_ID.clone(),
                 HostNetworkConfig {
                     host_id: ANOTHER_HOST_ID.clone(),
-                    switch_ports: vec![SwitchPort {
+                    switch_ports: vec![
-                        interface: ANOTHER_EXISTING_INTERFACE.clone(),
+                        SwitchPort {
-                        port: ANOTHER_PORT.clone(),
+                            interface: YET_ANOTHER_EXISTING_INTERFACE.clone(),
-                    }],
+                            port: YET_ANOTHER_PORT.clone(),
+                        },
+                        SwitchPort {
+                            interface: LAST_EXISTING_INTERFACE.clone(),
+                            port: LAST_PORT.clone(),
+                        },
+                    ],
                 },
             ),
         ]);
     }
 
     #[tokio::test]
-    async fn port_not_found_for_mac_address_should_not_configure_interface() {
+    async fn multiple_hosts_should_configure_one_port_channel_per_host() {
+        let score = given_score(vec![
+            given_host(
+                &HOST_ID,
+                vec![
+                    EXISTING_INTERFACE.clone(),
+                    ANOTHER_EXISTING_INTERFACE.clone(),
+                ],
+            ),
+            given_host(
+                &ANOTHER_HOST_ID,
+                vec![
+                    YET_ANOTHER_EXISTING_INTERFACE.clone(),
+                    LAST_EXISTING_INTERFACE.clone(),
+                ],
+            ),
+        ]);
+        let topology = TopologyWithSwitch::new();
+
+        let _ = score.interpret(&Inventory::empty(), &topology).await;
+
+        let config = topology.configured_port_channels.lock().unwrap();
+        assert_that!(*config).contains_exactly(vec![
+            (
+                HOST_ID.clone(),
+                HostNetworkConfig {
+                    host_id: HOST_ID.clone(),
+                    switch_ports: vec![
+                        SwitchPort {
+                            interface: EXISTING_INTERFACE.clone(),
+                            port: PORT.clone(),
+                        },
+                        SwitchPort {
+                            interface: ANOTHER_EXISTING_INTERFACE.clone(),
+                            port: ANOTHER_PORT.clone(),
+                        },
+                    ],
+                },
+            ),
+            (
+                ANOTHER_HOST_ID.clone(),
+                HostNetworkConfig {
+                    host_id: ANOTHER_HOST_ID.clone(),
+                    switch_ports: vec![
+                        SwitchPort {
+                            interface: YET_ANOTHER_EXISTING_INTERFACE.clone(),
+                            port: YET_ANOTHER_PORT.clone(),
+                        },
+                        SwitchPort {
+                            interface: LAST_EXISTING_INTERFACE.clone(),
+                            port: LAST_PORT.clone(),
+                        },
+                    ],
+                },
+            ),
+        ]);
+    }
+
+    #[tokio::test]
+    async fn port_not_found_for_mac_address_should_not_configure_host() {
         let score = given_score(vec![given_host(&HOST_ID, vec![UNKNOWN_INTERFACE.clone()])]);
         let topology = TopologyWithSwitch::new_port_not_found();
 
         let _ = score.interpret(&Inventory::empty(), &topology).await;
 
-        let configured_host_networks = topology.configured_host_networks.lock().unwrap();
+        let config = topology.configured_port_channels.lock().unwrap();
-        assert_that!(*configured_host_networks).is_empty();
+        assert_that!(*config).is_empty();
+        let config = topology.configured_bonds.lock().unwrap();
+        assert_that!(*config).is_empty();
+    }
+
+    #[tokio::test]
+    async fn only_one_port_found_for_multiple_mac_addresses_should_not_configure_host() {
+        let score = given_score(vec![given_host(
+            &HOST_ID,
+            vec![EXISTING_INTERFACE.clone(), UNKNOWN_INTERFACE.clone()],
+        )]);
+        let topology = TopologyWithSwitch::new_single_port_found();
+
+        let _ = score.interpret(&Inventory::empty(), &topology).await;
+
+        let config = topology.configured_port_channels.lock().unwrap();
+        assert_that!(*config).is_empty();
+        let config = topology.configured_bonds.lock().unwrap();
+        assert_that!(*config).is_empty();
     }
 
     fn given_score(hosts: Vec<PhysicalHost>) -> HostNetworkConfigurationScore {
@@ -422,26 +591,48 @@ mod tests {
         }
     }
 
+    #[derive(Debug)]
     struct TopologyWithSwitch {
         available_ports: Arc<Mutex<Vec<PortLocation>>>,
-        configured_host_networks: Arc<Mutex<Vec<(Id, HostNetworkConfig)>>>,
+        configured_port_channels: Arc<Mutex<Vec<(Id, HostNetworkConfig)>>>,
         switch_setup: Arc<Mutex<bool>>,
+        network_manager_setup: Arc<Mutex<bool>>,
+        configured_bonds: Arc<Mutex<Vec<(Id, HostNetworkConfig)>>>,
     }
 
     impl TopologyWithSwitch {
         fn new() -> Self {
             Self {
-                available_ports: Arc::new(Mutex::new(vec![PORT.clone(), ANOTHER_PORT.clone()])),
+                available_ports: Arc::new(Mutex::new(vec![
-                configured_host_networks: Arc::new(Mutex::new(vec![])),
+                    PORT.clone(),
+                    ANOTHER_PORT.clone(),
+                    YET_ANOTHER_PORT.clone(),
+                    LAST_PORT.clone(),
+                ])),
+                configured_port_channels: Arc::new(Mutex::new(vec![])),
                 switch_setup: Arc::new(Mutex::new(false)),
+                network_manager_setup: Arc::new(Mutex::new(false)),
+                configured_bonds: Arc::new(Mutex::new(vec![])),
             }
         }
 
         fn new_port_not_found() -> Self {
             Self {
                 available_ports: Arc::new(Mutex::new(vec![])),
-                configured_host_networks: Arc::new(Mutex::new(vec![])),
+                configured_port_channels: Arc::new(Mutex::new(vec![])),
                 switch_setup: Arc::new(Mutex::new(false)),
+                network_manager_setup: Arc::new(Mutex::new(false)),
+                configured_bonds: Arc::new(Mutex::new(vec![])),
+            }
+        }
+
+        fn new_single_port_found() -> Self {
+            Self {
+                available_ports: Arc::new(Mutex::new(vec![PORT.clone()])),
+                configured_port_channels: Arc::new(Mutex::new(vec![])),
+                switch_setup: Arc::new(Mutex::new(false)),
+                network_manager_setup: Arc::new(Mutex::new(false)),
+                configured_bonds: Arc::new(Mutex::new(vec![])),
             }
         }
     }
@@ -457,6 +648,22 @@ mod tests {
         }
     }
 
+    #[async_trait]
+    impl NetworkManager for TopologyWithSwitch {
+        async fn ensure_network_manager_installed(&self) -> Result<(), NetworkError> {
+            let mut network_manager_installed = self.network_manager_setup.lock().unwrap();
+            *network_manager_installed = true;
+            Ok(())
+        }
+
+        async fn configure_bond(&self, config: &HostNetworkConfig) -> Result<(), NetworkError> {
+            let mut configured_bonds = self.configured_bonds.lock().unwrap();
+            configured_bonds.push((config.host_id.clone(), config.clone()));
+
+            Ok(())
+        }
+    }
+
     #[async_trait]
     impl Switch for TopologyWithSwitch {
         async fn setup_switch(&self) -> Result<(), SwitchError> {
@@ -476,12 +683,12 @@ mod tests {
             Ok(Some(ports.remove(0)))
         }
 
-        async fn configure_host_network(
+        async fn configure_port_channel(
             &self,
             config: &HostNetworkConfig,
         ) -> Result<(), SwitchError> {
-            let mut configured_host_networks = self.configured_host_networks.lock().unwrap();
+            let mut configured_port_channels = self.configured_port_channels.lock().unwrap();
-            configured_host_networks.push((config.host_id.clone(), config.clone()));
+            configured_port_channels.push((config.host_id.clone(), config.clone()));
 
             Ok(())
         }

harmony_types/src/net.rs

@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize, PartialOrd, Ord)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize, PartialOrd, Ord)]
 pub struct MacAddress(pub [u8; 6]);
 
 impl MacAddress {
@@ -19,6 +19,14 @@ impl From<&MacAddress> for String {
     }
 }
 
+impl std::fmt::Debug for MacAddress {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_tuple("MacAddress")
+            .field(&String::from(self))
+            .finish()
+    }
+}
+
 impl std::fmt::Display for MacAddress {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.write_str(&String::from(self))