錯誤的daemon.json配置，導致docker容器啟動失敗 Failed to start Docker Application Container Engine

• docker學習－配置錯誤的源
  • 問題點剖析
  • 參考

docker學習－配置錯誤的源

問題點剖析

使用docker安裝了nginx，編寫Dockerfile,映射端口，終於跑起來了。但是，當我重啟服務器，再次查看docker容器的狀態，發現報錯了。

# docker ps -a
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

然后重啟docker

#  sudo service docker start
Redirecting to /bin/systemctl start docker.service
Job for docker.service failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details.
To force a start use "systemctl reset-failed docker.service" followed by "systemctl start docker.service" again.

發現還是不行，根據提示查看docker.service的status

# systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 二 2020-05-05 01:13:34 CST; 9s ago
     Docs: https://docs.docker.com
  Process: 1880 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
 Main PID: 1880 (code=exited, status=1/FAILURE)

5月 05 01:13:32 10.0.2.8 systemd[1]: docker.service: main process exited, code=exited, sta...URE
5月 05 01:13:32 10.0.2.8 systemd[1]: Failed to start Docker Application Container Engine.
5月 05 01:13:32 10.0.2.8 systemd[1]: Unit docker.service entered failed state.
5月 05 01:13:32 10.0.2.8 systemd[1]: docker.service failed.
5月 05 01:13:34 10.0.2.8 systemd[1]: docker.service holdoff time over, scheduling restart.
5月 05 01:13:34 10.0.2.8 systemd[1]: Stopped Docker Application Container Engine.
5月 05 01:13:34 10.0.2.8 systemd[1]: start request repeated too quickly for docker.service
5月 05 01:13:34 10.0.2.8 systemd[1]: Failed to start Docker Application Container Engine.
5月 05 01:13:34 10.0.2.8 systemd[1]: Unit docker.service entered failed state.
5月 05 01:13:34 10.0.2.8 systemd[1]: docker.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

分析發現原因是docker不能啟動

Failed to start Docker Application Container Engine.

daemon.json如果包含格式不正確的JSON，Docker將無法啟動

檢查了一下daemon.json,果真，少了一個“。

修改daemon.json，然后重啟解決了。

參考

【docker安裝完了以后，服務啟動不了】http://www.docker.org.cn/thread/72.html