Docker config remote API via daemon.json issue

使用daemon.json配置docker remote API时出现以下错误:

Aug 09 10:38:49 node02 dockerd[1169]: unable to configure the Docker daemon with file /etc/docker/daemon.json: the following directives are specified both as a flag and in the configuration file: hosts: (from flag: [fd://], from file: [ unix:///var/run/docker.sock tcp://0.0.0.0:2376])

解决方法：

1. Use the command sudo systemctl edit docker.service to open an override file for docker.service in a text editor.

2. Add or modify the following lines, substituting your own values.

   [Service]
   ExecStart=
   ExecStart=/usr/bin/dockerd
   

3. Save the file.

4. Reload the systemctl configuration. $ sudo systemctl daemon-reload

5. Restart Docker. $ sudo systemctl restart docker.service

6. Check to see whether the change was honored by reviewing the output of netstat to confirm dockerd is listening on the configured port.

   $ sudo netstat -lntp | grep dockerd
   tcp        0      0 0.0.0.0:2376          0.0.0.0:*               LISTEN      3758/dockerd