docker启动失败

环境：centos7

命令：systemctl start docker

报错信息：

[root@localhost ~]# systemctl status docker.service -l
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2019-08-06 11:37:38 EDT; 4min 32s ago
     Docs: http://docs.docker.com
  Process: 5027 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 --init-path=/usr/libexec/docker/docker-init-current --seccomp-profile=/etc/docker/seccomp.json $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=1/FAILURE)
 Main PID: 5027 (code=exited, status=1/FAILURE)

Aug 06 11:37:35 localhost.localdomain systemd[1]: Starting Docker Application Container Engine...
Aug 06 11:37:35 localhost.localdomain dockerd-current[5027]: time="2019-08-06T11:37:35.694105147-04:00" level=warning msg="could not change group /var/run/docker.sock to docker: group docker not found"
Aug 06 11:37:35 localhost.localdomain dockerd-current[5027]: time="2019-08-06T11:37:35.706150308-04:00" level=info msg="libcontainerd: new containerd process, pid: 5034"
Aug 06 11:37:36 localhost.localdomain dockerd-current[5027]: time="2019-08-06T11:37:36.721859443-04:00" level=warning msg="overlay2: the backing xfs filesystem is formatted without d_type support, which leads to incorrect behavior. Reformat the filesystem with ftype=1 to enable d_type support. Running without d_type support will no longer be supported in Docker 1.16."

Aug 06 11:37:38 localhost.localdomain dockerd-current[5027]: 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)

Aug 06 11:37:38 localhost.localdomain systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Aug 06 11:37:38 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
Aug 06 11:37:38 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
Aug 06 11:37:38 localhost.localdomain systemd[1]: docker.service failed.

主要错误信息：

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)

解决方案：

vi /etc/sysconfig/docker

修改信息：

# 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

修改selinux-enabled=false,重新启动成功