参考：http://www.docker.org.cn/book/install/install-docker-on-rhel-29.html
环境：Centos 或 Redhat
1、检查依赖包
# uname -r
3.10.0-862.9.1.el7.x86_64
Docker需要一个64位系统的红帽系统，内核的版本必须大于3.10。可以用下面的命令来检查是否满足docker的要求。
2、更新yum包
# sudo yum update
3、安装docker
# sudo yum install docker-engine
一般Linux系统自带docker，这步可以忽略，或者已安装再执行安装会提示已安装，若默认自带的docker不符合需要可以卸载再进行安装
4、启动docker服务
# sudo service docker start
5、确认docker安装成功
# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
d1725b59e92d: Pull complete
Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
显示latest: Pulling from library/hello-world说明是去仓库拉取镜像了，验证安装成功
6、docker服务自启动
# chkconfig docker on
Note: Forwarding request to 'systemctl enable docker.service'.
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
7、删除docker
查看yum包名称
# sudo yum list installed |grep docker
docker.x86_64 2:1.13.1-74.git6e3bb8e.el7.centos @extras
删除docker
yum -y remove docker.x86_64
以上是删除了docker的运行环境，但是镜像等信息还存在，若删除则继续找到docker镜像目录删除
rm -rf /var/lib/docker