Azure Kubernetes Service

Pods authenticate with the service account they run as.

What proves the identity

The token has to come from https://eastus.oic.prod-aks.azure.com/<tenant-id>/<cluster-id>/, and its sub claim has to match the workload you named. penv compares that claim byte for byte, with no wildcards.

Every token also has to name your workspace as its audience. Ask for this audience and no other. A token requested for two audiences fails every exchange.

What the console asks for

The console also asks which project and environment this identity reaches and which role it gets, with the credential lifetime behind Advanced.

What the trust holds

Built from the example answers above:

penv names the identity for you, so the form never asks for one.

The snippet the console prints

volumes:
  - name: penv-token
    projected:
      sources:
        - serviceAccountToken:
            path: token
            # Ask for this audience and no other. A token requested for two audiences fails every exchange.
            audience: YOUR_WORKSPACE_ID
            expirationSeconds: 3600

containers:
  - name: api
    volumeMounts:
      # Without this the volume above exists and no container can read it.
      - name: penv-token
        mountPath: /var/run/secrets/penv
        readOnly: true

# in the container:
#   T=$(cat /var/run/secrets/penv/token)
#   C=$(curl -sS "https://penv.cloud/api/v1/auth/oidc" \

Related

• Machine identity
• Connect a Platform in the console
• Azure Kubernetes Service documentation, where the value people get wrong is always the subject