卸载旧版Docker

新版docker无法覆盖旧版的，所以需要先卸载原来的旧版本

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Docker依赖

yum install -y yum-utils device-mapper-persistent-data lvm2

安装Docker

yum install -y docker

查看docker版本

docker -v

启动docker

# 启动docker
systemctl start docker
# dockerk开机自启
systemctl enable docker