Azure Containers built-in role
Azure Kubernetes Fleet Manager RBAC Cluster Admin
Azure Kubernetes Fleet Manager RBAC Cluster Admin grants read and write access to all Kubernetes resources within the granted Fleet or Managed Fleet Namespace scope on the hub cluster. The effective workload authority is expressed as Kubernetes API DataActions under the Microsoft.ContainerService Fleet resource provider. The role also includes Fleet read and listCredentials Actions, so the assignee can retrieve the hub-cluster kubeconfig; credential retrieval is not a separate assignment for this role.
Role-definition permissions are imported from Microsoft Learn. Practical scope, use cases, prerequisites, best practices, security considerations, assignment guidance, and relationships have been reviewed against the official sources below.
Role definition ID: 18ab4d3d-a1bf-4477-8ad9-8359bc988f69
Control-plane actions (6)
Microsoft.Authorization/*/readMicrosoft.Resources/subscriptions/operationresults/readMicrosoft.Resources/subscriptions/readMicrosoft.Resources/subscriptions/resourceGroups/readMicrosoft.ContainerService/fleets/readMicrosoft.ContainerService/fleets/listCredentials/action
Data-plane actions (1)
Microsoft.ContainerService/fleets/*
Excluded actions (1)
Microsoft.ContainerService/fleets/members/*
Assignable scopes (1)
/
Practical scope
Assign on the Fleet ARM resource for fleet-wide access or on its Microsoft.ContainerService/fleets/managedNamespaces ARM subresource for one Managed Fleet Namespace. These roles aren't assigned directly to a generic hub-cluster or member-cluster Kubernetes namespace. At Fleet scope, the hub role applies across hub namespaces; at Managed Fleet Namespace scope, it is limited to that managed namespace.
Common use cases (1)
- Let a tightly controlled administrator manage all Kubernetes resources within an assigned Managed Fleet Namespace or across the hub cluster when assigned at Fleet scope.
Prerequisites (2)
- The the fleet-managed hub cluster must use the documented Microsoft Entra and Azure RBAC integration for Kubernetes authorization.
- Protect the kubeconfig retrieved through this same role and verify that its user authentication context maps to the intended Kubernetes authorization.
Best practices (2)
- Use eligible or time-bound access where available, require an operational justification, and remove standing cluster-admin assignments.
- Audit Kubernetes API activity and review the ServiceAccounts, Secrets, and authorization objects reachable within the assigned scope.
Security considerations (3)
- Cluster-admin DataActions grant complete Kubernetes API control within the assigned Managed Fleet Namespace; at Fleet scope, they extend across the hub cluster and all of its namespaces.
- An Azure role assignment at a parent scope is inherited by child cluster resources; Kubernetes namespace semantics do not prevent a broad Azure assignment from reaching multiple clusters.
- The included credential-list Action exposes a reusable kubeconfig connection context in addition to the role's Kubernetes API DataActions.
Assignment guidance
Assign Azure Kubernetes Fleet Manager RBAC Cluster Admin at the exact Fleet resource or Managed Fleet Namespace ARM subresource to the principal that needs read and write access to all Kubernetes resources. Treat the included kubeconfig retrieval as part of the grant, test both credential download and Kubernetes authorization, and protect downloaded credentials.
Editorial sources (6)
- Azure built-in roles for Containers - Azure RBAC | Microsoft Learn →
Supports: Description, Practical scope, Common use cases, Prerequisites, Best practices, Security considerations, Assignment guidance. Retrieved 2026-07-17.
- Understand Azure role definitions →
Supports: Description, Security considerations. Retrieved 2026-07-17.
- Steps to assign an Azure role →
Supports: Assignment guidance. Retrieved 2026-07-17.
- Understand scope for Azure RBAC →
Supports: Practical scope, Assignment guidance. Retrieved 2026-07-17.
- Best practices for Azure RBAC →
Supports: Best practices, Assignment guidance. Retrieved 2026-07-17.
- Using Azure RBAC with Azure Kubernetes Fleet Manager →
Supports: Description, Practical scope, Common use cases, Prerequisites, Best practices, Security considerations, Assignment guidance. Retrieved 2026-07-17.