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：

[root@localhost ~]# 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[1]: Starting Dock...

安装问题，这时通过卸载原来的docker如下：

[root@localhost ~]# 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!

[root@localhost ~]# vi /etc/yum.repos.d/docker.repo

[dockerrepo]

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：

[root@localhost ~]# 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：

[root@localhost ~]# service docker start

Redirecting to /bin/systemctl start  docker.service

重新查看docker运行状态

[root@localhost ~]# 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