【Docker】/usr/bin/docker-current: Cannot connect to the Docker daemon at unix

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报错如下：
/usr/bin/docker-current: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See '/usr/bin/docker-current run --help'.

message内容：

Jul 10 01:07:04 docker systemd: docker.service: main process exited, code=exited, status=1/FAILURE

Jul 10 01:07:04 docker systemd: Unit docker.service entered failed state.
Jul 10 01:07:04 docker systemd: Failed to start Docker Application Container Engine.
Jul 10 01:07:04 docker dockerd-current: --label list Set key=value labels to the daemon (default [])
Jul 10 01:07:04 docker dockerd-current: --live-restore Enable live restore of docker when containers are still running
Jul 10 01:07:04 docker dockerd-current: --log-driver string Default driver for container logs (default "json-file")
Jul 10 01:07:04 docker dockerd-current: -l, --log-level string Set the logging level ("debug", "info", "warn", "error", "fatal") (default "info")

Jul 10 01:14:10 docker journal: g_simple_action_set_enabled: assertion 'G_IS_SIMPLE_ACTION (simple)' failed
Jul 10 01:14:10 docker journal: g_simple_action_set_enabled: assertion 'G_IS_SIMPLE_ACTION (simple)' failed
Jul 10 01:14:39 docker journal: g_simple_action_set_enabled: assertion 'G_IS_SIMPLE_ACTION (simple)' failed
Jul 10 01:15:27 docker journal: g_simple_action_set_enabled: assertion 'G_IS_SIMPLE_ACTION (simple)' failed
Jul 10 01:17:14 docker kube-controller-manager: W0710 01:17:14.365703 9051 reflector.go:319] pkg/controller/garbagecollector/garbagecollector.go:768: watch of <nil> ended with: 401: The event in requested index is outdated and cleared (the requested history has been cleared [377/32]) [1376]
Jul 10 01:17:39 docker journal: g_simple_action_set_enabled: assertion 'G_IS_SIMPLE_ACTION (simple)' failed

解决办法：

/lib/systemd/system/docker.service文件（确保万无一失，先备份一份）

原文件部分内容：

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

这上述部分全部删掉：

并重新写成如下部分内容：

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock -H tcp://0.0.0.0:7654

其他参数不变，重启docker

systemctl daemon-reload

systemctl restart docker.service

完成后，查看是否启动正常，并且可以看到版本信息

[root@docker system]# docker version
Client:
Version: 1.13.1
API version: 1.26
Package version: docker-1.13.1-96.gitb2f74b2.el7.centos.x86_64
Go version: go1.10.3
Git commit: b2f74b2/1.13.1
Built: Wed May 1 14:55:20 2019
OS/Arch: linux/amd64

Server:
Version: 1.13.1
API version: 1.26 (minimum version 1.12)
Package version: docker-1.13.1-96.gitb2f74b2.el7.centos.x86_64
Go version: go1.10.3
Git commit: b2f74b2/1.13.1
Built: Wed May 1 14:55:20 2019
OS/Arch: linux/amd64
Experimental: false

巴特西

【Docker】/usr/bin/docker-current: Cannot connect to the Docker daemon at unix

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