记录下centos7安装docker以及安装过程中出现的问题（以下全部为root权限执行命令）：
更新源
yum update
卸载旧版本
yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-selinux \ docker-engine-selinux \ docker-engine
安装依赖
yum install -y yum-utils device-mapper-persistent-data lvm2
添加docker源
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
更新新添加的源
sudo yum makecache fast
安装docker
yum -y install docker-ce
启动docker
systemctl start docker
问题一：yum -y install docker-ce出现下面问题
Error: Package: docker-ce-17.03.2.ce-1.el7.centos.x86_64 (nfjd-docker) Requires: docker-ce-selinux >= 17.03.2.ce-1.el7.centos Available: docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch (nfjd-docker) docker-ce-selinux = 17.03.2.ce-1.el7.centos You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest
解决方法：
yum install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm yum -y install docker-ce
问题二：启动docker出现以下问题
Jan 15 10:56:54 nfjd-dp-web-test01-93126.jpushoa.com dockerd[29983]: Error starting daemon: Error initializing network controller: list bridge addresses failed: no available network Jan 15 10:56:54 nfjd-dp-web-test01-93126.jpushoa.com systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Jan 15 10:56:54 nfjd-dp-web-test01-93126.jpushoa.com systemd[1]: Failed to start Docker Application Container Engine. Jan 15 10:56:54 nfjd-dp-web-test01-93126.jpushoa.com systemd[1]: Unit docker.service entered failed state. Jan 15 10:56:54 nfjd-dp-web-test01-93126.jpushoa.com systemd[1]: docker.service failed.
解决方法：
ifconfig查看发现没有docker0网卡
查看服务器路由：route -n 发现存在172.16.0.0网段，与docker中检查ip网段重复。所以只要删除即可：
route -n route del -net 172.16.0.0/12 systemctl start docker