报错如下： /usr/bin/docker-current: Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?. See '/usr/bin/docker-current run --help'. 解决办法：
进入 /lib/systemd/system/docker.service
原文件部分内容：
ExecStart=/fsr/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
这上述部分全部注释，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@localhost system]# docker version Client: Version: 1.13.1 API version: 1.26 Package version: docker-1.13.1-102.git7f2769b.el7.centos.x86_64 Go version: go1.10.3 Git commit: 7f2769b/1.13.1 Built: Mon Aug 5 15:09:42 2019 OS/Arch: linux/amd64
Server: Version: 1.13.1 API version: 1.26 (minimum version 1.12) Package version: docker-1.13.1-102.git7f2769b.el7.centos.x86_64 Go version: go1.10.3 Git commit: 7f2769b/1.13.1 Built: Mon Aug 5 15:09:42 2019 OS/Arch: linux/amd64 Experimental: false
