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报错信息如下：
[root@br-apm-002 system]# docker ps -a
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[root@br-apm-002 system]# systemctl restart docker
Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details.
[root@br-apm-002 system]# 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 Wed 2021-11-17 11:20:05 CST; 9s ago
Docs: http://docs.docker.com
Process: 9508 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --selinux-enabled=false --log-opt max-size=50m (code=exited, status=1/FAILURE)
Main PID: 9508 (code=exited, status=1/FAILURE)
Nov 17 11:20:05 br-apm-002 systemd[1]: Failed to start Docker Application Container Engine.
Nov 17 11:20:05 br-apm-002 systemd[1]: Unit docker.service entered failed state.
Nov 17 11:20:05 br-apm-002 systemd[1]: docker.service failed.
Nov 17 11:20:05 br-apm-002 systemd[1]: docker.service holdoff time over, scheduling restart.
Nov 17 11:20:05 br-apm-002 systemd[1]: Stopped Docker Application Container Engine.
Nov 17 11:20:05 br-apm-002 systemd[1]: start request repeated too quickly for docker.service
Nov 17 11:20:05 br-apm-002 systemd[1]: Failed to start Docker Application Container Engine.
Nov 17 11:20:05 br-apm-002 systemd[1]: Unit docker.service entered failed state.
Nov 17 11:20:05 br-apm-002 systemd[1]: docker.service failed.
解决方法：
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