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=
gpgcheck=
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:
 . The Docker client contacted the Docker daemon.
 . The Docker daemon pulled the "hello-world" image from the Docker Hub.
 . The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 . 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.-.el7.centos                 @dockerrepo
docker-engine-selinux.noarch     1.11.-.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