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Azure Kubernetes Fleet Manager supports two types of member clusters:
The following table outlines which Azure Kubernetes Fleet Manager capabilities are supported for each member cluster type.
| Capability | AKS cluster | Arc-enabled Kubernetes cluster |
|---|---|---|
| Kubernetes and node image updates | ✅ GA | ❌ Unsupported |
| Cross-cluster networking | ✅ Preview | ❌ Unsupported |
| Workload placement | ✅ GA | ✅ GA |
| DNS load balancing | ✅ GA | ❌ Unsupported |
| Managed Namespaces | ✅ Preview | ✅ Preview |
| Managed Namespace RBAC | ✅ Preview | ❌ Unsupported |
| Non-public Azure regions | ✅ GA | ❌ Unsupported |
Arc-enabled Kubernetes Clusters important considerations
Depending on your environment and configuration, certain limitations may apply when connecting an Arc-enabled Kubernetes cluster to an Azure Kubernetes Fleet Manager hub. Review the following considerations.
Cluster resource requirements
When you add an Arc-enabled Kubernetes cluster to Fleet Manager, the following conditions apply on the member cluster:
- At least 210 MB memory and 2% of one CPU core available.
- The cluster should reserve 3 pods for the Azure Kubernetes Fleet Manager Arc extension agents.
- The fleet-system namespace is created for Fleet-related components and shouldn't be directly modified.
Private Fleet
For Private Fleets, your Arc-enabled Kubernetes cluster must be configured to use Azure Arc Gateway.
Networking
TLS-terminating proxies are not supported. If using a passthrough proxy, your Arc-enabled Kubernetes cluster must also be configured to use Azure Arc Gateway.
Non-public region limitation
Fleet Manager Arc-enabled Kubernetes cluster support is only currently available in Azure public cloud regions due to the dependency on Azure Arc Gateway.
If you attempt to create an Arc-enabled member cluster in a non-public cloud region, an error of type FeatureNotAvailableInCloud with the message The feature 'Arc Member Cluster' is not available in cloud environment is returned.
Track the status of Azure Arc Gateway regional availability via its official documentation.