基于centos的docker安装

yum update

tee /etc/yum.repos.d/docker.repo <<-'EOF'
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF

yum install docker-engine

service docker start

docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c04b14da8d14: Pull complete
Digest: sha256:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9
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.
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 Hub account: https://hub.docker.com 
For more examples and ideas, visit: https://docs.docker.com/engine/userguide/[/code] 
8. 创建docker组（可选）

docker命令必须root权限执行，但docker用户组默认拥有这个权限

groupadd docker
usermod -aG docker your_username


docker组的用户默认可执行docker命令，无需root权限

9. 启动时运行docker服务（可选）

chkconfig docker on


10. 卸载docker

查看安装docker包

$ yum list installed | grep docker
docker-engine.x86_64             1.11.2-1.el7.centos                 @dockerrepo
docker-engine-selinux.noarch     1.11.2-1.el7.centos                 @dockerrepo


删除安装的包

yum -y remove docker-engine.x86_64


这一步并未删除数据，要想删除镜像、容器和磁盘卷，执行如下命令

rm -rf /var/lib/docker