docker安装

docker yum源配置

1. 安装依赖软件包 yum-utils，device-mapper-persistent-data 和 lvm2
   
   yum-utils：用于提供 yum-config-manager命令行工具
   
   device-mapper-persistent-data 和 lvm2:用于devicemap存储驱动
   

   yum install -y yum-utils device-mapper-persistent-data lvm2
   

2. 添加docker-ce.repo
   

   yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
   

3. 可选配置 启用或禁用docker软件包的edge和test分支,主要提供新特性的测试版
   
   启用：
   

   yum-config-manager --enable docker-ce-edge
   yum-config-manager --enable docker-ce-test
   

禁用：

shell yum-config-manager --disable docker-ce-edge yum-config-manager --disable docker-ce-test

安装docker

1. 检索yum源
   

   [root@master yum.repos.d]# yum list docker-ce  
   Loaded plugins: fastestmirror, langpacks  
   docker-ce-stable  | 2.9 kB  00:00:00   
   docker-ce-stable/x86_64/primary_db|  11 kB  00:00:01   
   Loading mirror speeds from cached hostfile
    * base: mirrors.aliyun.com  
    * epel: mirrors.aliyun.com  
    * extras: mirrors.aliyun.com  
    * updates: mirrors.aliyun.com  
   Available Packages  
   docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable
   

这里已经能从yum源里检索到了docker-ce的软件包了，接下安装就行。
2. 安装docker

shell yum install docker-ce-17.12.0.ce-1.el7.centos yum install docker-ce-selinux
3. 启动docker

shell [root@master yum.repos.d]# systemctl start docker [root@master yum.repos.d]# systemctl status docker docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled) Active: active (running) since Thu 2018-01-04 16:59:21 CST; 6s ago Docs: https://docs.docker.com Main PID: 126183 (dockerd) Memory: 30.0M CGroup: /system.slice/docker.service ├─126183 /usr/bin/dockerd └─126190 docker-containerd --config /var/run/docker/containerd/cont... Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21+08:00" lev...rd Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.304543557+...s" Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.305864672+...." Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.431345841+...s" Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.484089063+...." Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.490360169+...x" Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.500279497+...ce Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.500509381+...n" Jan 04 16:59:21 master dockerd[126183]: time="2018-01-04T16:59:21.507349994+...k" Jan 04 16:59:21 master systemd[1]: Started Docker Application Container Engine. Hint: Some lines were ellipsized, use -l to show in full.
4. 测试docker是否可以正常运行

```shell
[root@master yum.repos.d]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
ca4f61b1923c: Pull complete
Digest: sha256:445b2fe9afea8b4aa0b2f27fe49dd6ad130dfe7a8fd0832be5de99625dad47cd
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.
(amd64)
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 ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/
```