1.首先安装docker 因docker依赖操作系统相关软件

yum -y install gcc
yum -y install gcc-c++

1.1 卸载之前的docker版本

yum remove docker \

              docker-client \\
              docker-client-latest \
              docker-common \
              docker-latest \
              docker-latest-logrotate \
              docker-logrotate \\
              docker-engine

1.2安装docker并启动

yum install docker
systemctl start docker
systemctl enable docker 开机自启

1.3查看版本

docker version

1.4测试运行hello-world

docker run hello-world