centos7下docker启动失败解决

docker启动失败解决

could not change group /var/run/docker.sock to docker: gr... not found

如果出现：Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

可执行systemctl status docker.service查看具体出错原因进行相关搜索。

 

在使用systemctl start docker启动失败时，使用systemctl status docker.service其报告如下：

docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Fri -- :: EDT; 12s ago
Docs: http://docs.docker.com
Process:  ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current 
--default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current
 --seccomp-profile=/etc/docker/seccomp.json $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY
 $INSECURE_REGISTRY $REGISTRIES (code=exited, status=/FAILURE)
Main PID:  (code=exited, status=/FAILURE)

Apr  :: localhost.localdomain systemd[]: Starting Docker Application Container Engine...
Apr  :: localhost.localdomain dockerd-current[]: time="2018-04-27T02:38:35.166869440-04:00" level
=warning msg="could not change group /var/run/docker.sock to docker: group docker not found"
Apr  :: localhost.localdomain dockerd-current[]: time="2018-04-27T02:38:35.171487584-04:00" 
level=info msg="libcontainerd: new containerd process, pid: 2361"Apr  :: localhost.localdomain dockerd-current[]:
 Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Either boot into a newer kernel or disable selinux in docker
 (--selinux-enabled=false)Apr  :: localhost.localdomain systemd[]: docker.service: main process exited, code=exited, status=/FAILURE
Apr  :: localhost.localdomain systemd[]: Failed to start Docker Application Container Engine.
Apr  :: localhost.localdomain systemd[]: Unit docker.service entered failed state.Apr  :: localhost.localdomain systemd[]: docker.service failed. 

截图如下： 

此处意思是linux的内核中的SELinux不支持 overlay2 graph driver ，解决方法有两个，要么启动一个新内核，要么就在docker里禁用selinux，–selinux-enabled=false, 

解决办法如下：

.rm -rf /var/lib/docker/ #如果不删除这个文件夹可能会导致继续失败

.vi /etc/sysconfig/docker

 如此方法不能解决，可参考：https://segmentfault.com/q/1010000002392472?_ea=176528