阿里云centos安装docker-engine实践

近日在阿里云ECS服务器（centos系统）中安装docker，参考官方指南 https://docs.docker.com/engine/installation/linux/centos/ 大概流程都能跑通，但是中途发生了一些意外情况，特记录备案以免后来再次踩坑。

一、需要有登录ECS的工具（推荐Xshell）和拥有root权限的用户。

二、确保linux内核版本是3.10以上并且是64位的centos版本。如果不能满足这个前提，建议看官绕道走吧。

检查linux版本命令如下

$ uname -r

3.10.-.el7.x86_64

以上前提条件都满足，接下来就开始安装。

三、升级yum安装包，确保都是最新的版本

 $  sudo yum update

四、在yum repository增加docker的repository

$  sudo vim /etc/yum.repos.d/docker.repo

## 在vim编辑器中输入以下内容后保存

[dockerrepo]

name=Docker Repository

baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/

enabled=

gpgcheck=

gpgkey=https://yum.dockerproject.org/gpg

五、到这一步都进展顺利，接下来开始通过yum安装docker-engine了。想不到的事情发生了。。。

 $  sudo yum install docker-engine

## yum开始从docker repository下载组件... 一切貌似进展顺利，然而突然出现一个错误

warning: /var/cache/yum/x86_64//dockerrepo/packages/docker-engine-selinux-1.10.-.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 2c52609d: NOKEY

Retrieving key from https://yum.dockerproject.org/gpg

GPG key retrieval failed: [Errno ] Timeout on https://yum.dockerproject.org/gpg: (28, 'Resolving timed out after 3512 milliseconds')

怎么回事？从https://yum.dockerproject.org/repo/main/centos都能顺利下载其他组件，怎么就卡在https://yum.dockerproject.org/gpg这一步呢？

ping yum.dockerproject.org 显示一切网络正常。重试几次仍然同样故障。苦苦思索和尝试仍然没有结果，最后决定先绕道吧。（有知道的同学告知一声，不胜感激）

绕道的办法：

1. 从本机中打开https://yum.dockerproject.org/gpg，下载PKI证书文件

2. 在Xshell进行以下操作

$  sudo vim /usr/local/docker.gpg

## 在VIM编辑器中把本地下载的证书内容复制过去，保存

$ sudo rpm --import /usr/local/docker.gpg

3.手工导入docker的PKI公钥证书，安装总算能顺利进行下去了

六、安装docker-engine完成后，启动docker服务

$  sudo systemctl start docker.service

七、测试docker服务是否成功

 $  sudo docker run hello-world

##看到以下输出，就大功告成了

Unable to find image 'hello-world:latest' locally

latest: Pulling from library/hello-world

03f4658f8b78: Pull complete

a3ed95caeb02: Pull complete

Digest: sha256:8be990ef2aeb16dbcb9271ddfe2610fa6658d13f6dfb8bc72074cc1ca36966a7

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/userguide/

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阿里云centos安装docker-engine实践

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