docker的简单介绍
什么是容器？
虚拟化和容器的区别
1. docker安装
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum makecache fast
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 install -y docker-ce-17.03.2.ce-1.el7.centos.x86_64
2. 启动docker服务
systemctl daemon-reload
systemctl restart docker