[v1.6.0] The nodes added after installation do not use the local docker cache by default.

Organization Name:

Short summary about the issue/question: The nodes added after installation do not use the local docker cache by default.

Brief what process you are following:

1. install v1.6.0 on master and work-01 (/etc/docker/daemon.json on master must be {});
2. add node worker-02;
3. open /etc/docker/daemon.json.

master:

{"insecure-registries": ["http://master_ip:30500"], "registry-mirrors": ["http://master_ip:30500"]}

work-01:

{"default-runtime": "nvidia", "registry-mirrors": ["http://master_ip:30500"], "runtimes": {"nvidia": {"path": "/usr/bin/nvidia-container-runtime", "runtimeArgs": []}}, "insecure-registries": ["http://master_ip:30500"]}

work-02:

{
  "default-runtime": "nvidia",
  "runtimes": {
      "nvidia": {
          "path": "/usr/bin/nvidia-container-runtime",
          "runtimeArgs": []
      }
  }
}

How to reproduce it:

OpenPAI Environment:

• OpenPAI version: v1.6.0
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release): ubuntu 16.04
• Kernel (e.g. uname -a):
• Hardware (e.g. core number, memory size, storage size, GPU type etc.):
• Others:

Anything else we need to know:

Start by tracing how /etc/docker/daemon.json is generated during initial installation and when work-02 is added. Compare the resulting configuration with master and work-01; done means newly added nodes receive the local registry mirror and insecure-registry settings needed to use the Docker cache by default.