centos7 docker 启动失败 报错【Job for docker.service failed because the control process exited with error】

1.报错

   [[e-mail] ~]# 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

2.根据提示查看docker服务状态:

systemctl status docker.service

Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Ei…d=false)
SELinux不支持此内核上的overlay2图形驱动程序，禁用selinux即可

3.解决方法:

方法1:禁用selinux
     vi /etc/sysconfig/docker
     修改:selinux-enabled=false

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方法2:更新系统
     yum update
     重启系统:reboot

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4.重新运行docker

systemctl start docker