linux/虚拟机启动docker或运行docker命令报错_redirecting to /bin/systemctl start docker.service

在虚拟机yum安装docker之后，执行docker命令时报错：
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
然后启动docker时：

service docker start
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报错：

Redirecting to /bin/systemctl start  docker.service
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
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根据报错提示运行：systemctl status docker.service

systemctl status docker.service
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其中有一条报错信息：

Error starting daemon: pid file found, ensure docker is not running or delete /var/run/docker.pid
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启动守护程序时出错：找到pid文件，请确保docker未运行或删除/var/run/docker.pid
经过各种百度搜索及修改，再执行

systemctl status docker.service
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的时候，报错变成

Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. E...d=false)
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大概意思是：此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，
可以重新编译/etc/sysconfig/docker配置文件将–selinux-enabled改成–selinux-enabled=false

# Modify these options if you want to change the way the docker daemon runs
OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
    DOCKER_CERT_PATH=/etc/docker
fi
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改完后

# Modify these options if you want to change the way the docker daemon runs
OPTIONS='--selinux-enabled=false --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
    DOCKER_CERT_PATH=/etc/docker
fi
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再执行docker命令即可正确运行