問題：docker突然啟動不了，然后也用不了docker的命令，報錯如下。

[root@master opt]# docker network ls

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

1.檢查docker的運行狀態(tài)

[root@master opt]# 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: exit-code) since Thu 2022-12-01 21:45:45 CST; 12s ago

???? Docs: Docker Documentation | Docker Documentation

? Process: 2259 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.so>

?Main PID: 2259 (code=exited, status=1/FAILURE)

12月 01 21:45:43 master systemd[1]: docker.service: Main process exited, code=exited, status=1>

12月 01 21:45:43 master systemd[1]: docker.service: Failed with result 'exit-code'.

12月 01 21:45:43 master systemd[1]: Failed to start Docker Application Container Engine.

12月 01 21:45:45 master systemd[1]: docker.service: Service RestartSec=2s expired, scheduling >

12月 01 21:45:45 master systemd[1]: docker.service: Scheduled restart job, restart counter is >

12月 01 21:45:45 master systemd[1]: Stopped Docker Application Container Engine.

12月 01 21:45:45 master systemd[1]: docker.service: Start request repeated too quickly.

12月 01 21:45:45 master systemd[1]: docker.service: Failed with result 'exit-code'.

12月 01 21:45:45 master systemd[1]: Failed to start Docker Application Container Engine.

2.嘗試重啟docker服務

? 啟動報錯如下

[root@master opt]# systemctl start docker

Job for docker.service failed because the control process exited with error code.

See "systemctl status docker.service" and "journalctl -xe" for details.

解決方案：

修改配置文件后綴? --->把/etc/docker/daemon.json文件的.json后綴，修改為.conf后綴

[root@master ~]# mv /etc/docker/daemon.json /etc/docker/daemon.conf

成功啟動docker服務

[root@master ~]# systemctl start docker

查詢docker服務狀態(tài)

[root@master ~]# systemctl status docker

● docker.service - Docker Application Container Engine

?? Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)

?? Active: active (running) since Thu 2022-12-01 22:03:20 CST; 7s ago

???? Docs: Docker Documentation | Docker Documentation

?Main PID: 1723 (dockerd)

??? Tasks: 26

?? Memory: 51.1M

?? CGroup: /system.slice/docker.service

?????????? ├─1723 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

?????????? ├─1988 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 5000 -container>

?????????? └─1994 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 5000 -container-ip 1>

12月 01 22:03:18 master dockerd[1723]: time="2022-12-01T22:03:18.289854312+08:00" level=warnin>

12月 01 22:03:18 master dockerd[1723]: time="2022-12-01T22:03:18.290249654+08:00" level=info m>

12月 01 22:03:19 master dockerd[1723]: time="2022-12-01T22:03:19.277350833+08:00" level=info m>

12月 01 22:03:19 master dockerd[1723]: time="2022-12-01T22:03:19.297006452+08:00" level=warnin>

12月 01 22:03:19 master dockerd[1723]: time="2022-12-01T22:03:19.352761031+08:00" level=info m>

12月 01 22:03:20 master dockerd[1723]: time="2022-12-01T22:03:20.154534118+08:00" level=info m>

12月 01 22:03:20 master dockerd[1723]: time="2022-12-01T22:03:20.427561039+08:00" level=info m>

12月 01 22:03:20 master dockerd[1723]: time="2022-12-01T22:03:20.427731869+08:00" level=info m>

12月 01 22:03:20 master systemd[1]: Started Docker Application Container Engine.

12月 01 22:03:20 master dockerd[1723]: time="2022-12-01T22:03:20.499788277+08:00" level=info m>

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