基于centos的docker安装

1. 安装需求

• 内核版本3.10以上
• Centos 7以上
• 64位版本

2. 使用root登录或者具有sudo权限

3. 确保系统是最新的

 yum update

4. 添加yum源

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

5. 安装docker包

yum install docker-engine

6. 开启docker服务

service docker start

7. 验证安装

docker run hello-world

输出如下

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/

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