Kubelet Credential Provider

Note: The Kubelet credential provider feature is still in alpha and shouldn’t be used in production environments. Please use --azure-container-registry-config=/etc/kubernetes/cloud-config/azure.json if you need pulling images from ACR in production.

As part of Out-of-Tree Credential Providers, the kubelet builtin image pulling from ACR (which could be enabled by setting kubelet --azure-container-registry-config=<config-file>) would be moved out-of-tree credential plugin acr-credential-provider. Please refer the original KEP for details.

In order to switch the kubelet credential provider to out-of-tree, you’ll have to

• Remove --azure-container-registry-config from kubelet configuration options.
• Add --feature-gates=KubeletCredentialProviders=true to kubelet configuration options.
• Create directory /var/lib/kubelet/credential-provider, download ‘acr-credential-provider’ binary to this directory and add --image-credential-provider-bin-dir=/var/lib/kubelet/credential-provider to kubelet configuration options.
• Create the following credential-provider-config.yaml file and add --image-credential-provider-config=/var/lib/kubelet/credential-provider-config.yaml to kubelet configuration options.

# cat /var/lib/kubelet/credential-provider-config.yaml
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
- name: acr-credential-provider
  apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
  defaultCacheDuration: 10m
  matchImages:
  - "*.azurecr.io"
  - "*.azurecr.cn"
  - "*.azurecr.de"
  - "*.azurecr.us"
  - "*.azurecr.*" # Only required for custom Azure cloud.
  args:
  - /etc/kubernetes/cloud-config/azure.json