After installing docker on a new virtual machine CentOS7, the startup failed and the console reported an error:Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

Follow the prompts and enter the code to query for details:

systemctl status docker.service

The console displays:

Jan 21 03:19:26 localhost.localdomain systemd[1]: Starting Docker Application Container Engine...
Jan 21 03:19:26 localhost.localdomain dockerd-current[9713]: time="2019-01-21T03:19:26.243566124-05:00" level=warning msg="could not change group /var/run/dock...t found"
Jan 21 03:19:26 localhost.localdomain dockerd-current[9713]: time="2019-01-21T03:19:26.251588454-05:00" level=info msg="libcontainerd: new containerd process, pid: 9719"
Jan 21 03:19:27 localhost.localdomain dockerd-current[9713]: time="2019-01-21T03:19:27.274519154-05:00" level=warning msg="overlay2: the backing xfs filesystem is form...
Jan 21 03:19:27 localhost.localdomain dockerd-current[9713]: Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Eit...d=false)
Jan 21 03:19:27 localhost.localdomain systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Jan 21 03:19:27 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
Jan 21 03:19:27 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
Jan 21 03:19:27 localhost.localdomain systemd[1]: docker.service failed.

Notice this lineError starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Eit...d=false), roughly meaning it seems to beSELinux does not support the OrthALA2 graphics driver on this kernel.

Solution:

vi /etc/sysconfig/docker

Opened file:

# /etc/sysconfig/docker

# 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

Put--selinux-enabledChange to false, ie--selinux-enabled=false:
is as follows:

# /etc/sysconfig/docker

# 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

Restart docker

systemctl restart docker

Successful startup.

The above is the process of troubleshooting this problem, the record is for review.