我使用docker和docker-compose的时间很长，很不幸，服务重启后docker停止工作。
$docker --version
Docker version 18.09.0, build 4d60db4
$docker-compose --version
docker-compose version 1.22.0, build f46880fe
$docker info
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
$docker-compose up -d
ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?
If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.
$sudo docker-compose up -d
sudo: docker-compose: command not found
有什么办法解决这个问题吗？
编辑：这是我正在运行的systemctl状态docker.service
$systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: deactivating (stop-sigterm)
Docs: https://docs.docker.com
Main PID: 12895 (dockerd)
CGroup: /system.slice/docker.service
└─12895 /usr/bin/dockerd -H unix://
Apr 29 11:21:47 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:47.925508825Z" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420658690, REA...odule=grpc
Apr 29 11:21:47 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:47.968508750Z" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Apr 29 11:21:47 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:47.969364064Z" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420658910, CON...odule=grpc
Apr 29 11:21:47 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:47.970291215Z" level=info msg="pickfirstBalancer: HandleSubConnStateChange: 0xc420658910, REA...odule=grpc
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.700242870Z" level=warning msg="Usage of loopback devices is strongly discouraged for produ...vicemapper
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.788995880Z" level=warning msg="Base device already exists and has filesystem xfs on it. Us...vicemapper
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.799030787Z" level=info msg="[graphdriver] using prior storage driver: devicemapper"
Apr 29 11:21:50 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:50.749392075Z" level=info msg="Graph migration to content-addressability took 0.00 seconds"
Apr 29 11:21:50 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:50.753684781Z" level=info msg="Loading containers: start."
Apr 29 14:02:15 fiware.localhost dockerd[12895]: time="2019-04-29T14:02:15.823862127Z" level=info msg="Processing signal 'terminated'"
Hint: Some lines were ellipsized, use -l to show in full.
第二编辑：
$sudo dockerd --debug
Error starting daemon: pid file found, ensure docker is not running or delete /var/run/docker.pid
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.700242870Z" level=warning msg="Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man dockerd` to refer to dm.thinpooldev section." storage-driver=devicemapper
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.788995880Z" level=warning msg="Base device already exists and has filesystem xfs on it. User specified filesystem will be ignored." storage-driver=devicemapper
Apr 29 11:21:48 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:48.799030787Z" level=info msg="[graphdriver] using prior storage driver: devicemapper"
Apr 29 11:21:50 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:50.749392075Z" level=info msg="Graph migration to content-addressability took 0.00 seconds"
Apr 29 11:21:50 fiware.localhost dockerd[12895]: time="2019-04-29T11:21:50.753684781Z" level=info msg="Loading containers: start."
Apr 29 14:02:15 fiware.localhost dockerd[12895]: time="2019-04-29T14:02:15.823862127Z" level=info msg="Processing signal 'terminated'"