问CentOS 7-无法连接到unix://var/run/docker.sock上的Docker守护进程。码头守护进程正在运行吗？

EN

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Client:
 Version:         1.13.1
 API version:     1.26
 Package version: 
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Redirecting to /bin/systemctl status  -l docker.service
● 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 2020-04-10 18:00:02 CEST; 49min ago
     Docs: http://docs.docker.com
  Process: 4510 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: 4510 (code=exited, status=1/FAILURE)

Apr 10 18:00:01 ns3138286 systemd[1]: Starting Docker Application Container Engine...
Apr 10 18:00:01 ns3138286 dockerd-current[4510]: time="2020-04-10T18:00:01.506877169+02:00" level=info msg="libcontainerd: new containerd process, pid: 4522"
Apr 10 18:00:02 ns3138286 dockerd-current[4510]: time="2020-04-10T18:00:02.514107274+02:00" level=error msg="'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded."
Apr 10 18:00:02 ns3138286 dockerd-current[4510]: Error starting daemon: error initializing graphdriver: driver not supported
Apr 10 18:00:02 ns3138286 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Apr 10 18:00:02 ns3138286 systemd[1]: Failed to start Docker Application Container Engine.
Apr 10 18:00:02 ns3138286 systemd[1]: Unit docker.service entered failed state.
Apr 10 18:00:02 ns3138286 systemd[1]: docker.service failed.