centos7 安装docker

1、更新yum

sudo yum update

2、安装依赖软件包

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

3、设置yum安装源

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

4、查看所有仓库中所有docker版本

yum list docker-ce --showduplicates | sort -r

5、安装docker

sudo yum install docker-ce

6、启动并加入开机启动

sudo systemctl start docker
sudo systemctl enable docker

7、检查是否安装成功

docker ps

附：卸载旧的docker

sudo yum remove docker  docker-common docker-selinux docker-engine