kubespray/tests/common/_docker_hub_registry_mirror.yml

---
docker_registry_mirrors:
  - "https://mirror.gcr.io"

containerd_grpc_max_recv_message_size: 16777216
containerd_grpc_max_send_message_size: 16777216

containerd_registries:
  "docker.io":
    - "https://mirror.gcr.io"
    - "https://registry-1.docker.io"

containerd_max_container_log_line_size: -1

crio_registries_mirrors:
  - prefix: docker.io
    insecure: false
    blocked: false
    location: registry-1.docker.io
    mirrors:
      - location: mirror.gcr.io
        insecure: false