$ wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-18.03.1.ce-1.el7.centos.x86_64.rpm
$ sudo yum install docker-ce-18.03.1.ce-1.el7.centos.x86_64.rpm
# 加入自启动
$ sudo systemctl enable docker
# 启动docker
$ sudo systemctl start docker
$ sudo docker run hello-world

$ sudo systemctl status docker
# 开远程端口，允许远程访问
$ sudo vi /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock
# 刷新配置
$ sudo systemctl daemon-reload
# 重启docker
$ sudo systemctl restart docker

$ curl http://localhost:2375/version
$ curl http://localhost:2375/info

# 列出本地镜像
$ sudo docker images
# 删除本地一个或多少镜像
$ sudo docker rmi -f rancher/server
# 列出容器
$ sudo docker ps
# 显示所有的容器，包括未运行的
$ sudo docker ps -a

# https://docs.docker.com/storage/volumes/
# 创建数据卷
$ sudo docker volume create grafana-storage