centos下docker无法正常启动检查与解决方法
因公司某业务架构的变化，需要使用云微服务，需要使用openshift来统筹规划生产服务资源，让服务更好的运作，OpenShift为资源管理，围绕Docker容器打包和Kubernetes容器集群管理的核心构建，在安装docker服务时，碰到如下问题：安装玩docker后，无法正常启动，通过如下命令查看docker问题原因：
# systemctl status 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 Mon 2018-09-24 21:00:04 CST; 32s ago
Docs: http://docs.docker.com
Process: 20896 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 $REGISTRIES (code=exited, status=1/FAILURE)
Main PID: 20896 (code=exited, status=1/FAILURE)
Sep 24 21:00:01 localhost.localdomain systemd: Starting Dock...
安装问题，这时通过卸载原来的docker如下：
# yum remove docker-selinux
Loaded plugins: fastestmirror, langpacks
Resolving Dependencies
Removed:
container-selinux.noarch 2:2.68-1.el7
Dependency Removed:
docker-client.x86_64 2:1.13.1-74.git6e3bb8e.el7.centos
docker-common.x86_64 2:1.13.1-74.git6e3bb8e.el7.centos
编辑docker.repo，如下：
Complete!
# vi /etc/yum.repos.d/docker.repo
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
~
保存后，重新安装docker，如下：
# yum install docker-engine
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: mirrors.cn99.com
* updates: mirrors.cn99.com
安装完后，启动docker如下命令：
# service docker start
Redirecting to /bin/systemctl startdocker.service
重新查看docker运行状态
# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2018-09-24 21:55:08 CST; 19min ago
Docs: https://docs.docker.com
Main PID: 22892 (dockerd)
Memory: 56.6M
CGroup: /system.slice/docker.service
├─22892 /usr/bin/dockerd
└─22905 docker-containerd --config /var/run/docker/containerd/containerd.toml
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