準備：用到兩臺伺服器，一臺（192.168.160.134）用做開發者PC，一臺（192.168.160.135）用做伺服器

一、在開發者PC安裝git,並建立倉庫

安裝

[[email protected] ~]# yum install git

建立倉庫

[[email protected] ~]# git init exampleapp

轉到倉庫目錄，然後設定作者的電子郵件和名稱

[[email protected] ~]# cd exampleapp/
[[email protected] exampleapp]# git config --global usr.email 
 
[email protected] 
[[email protected] exampleapp]# git config --global usr.name  "mai ye ping"

二、開發者PC使用Node.js編寫簡單Web伺服器

[[email protected] ~]# vim exampleapp/app.js 

 var express = require('express');
var app = express();
app.get(['/','/index.html'],function (req,res){
 res.send('Hello Docker');
 });
app.listen(80);
 

[[email protected] ~]# vim exampleapp/package.json 

  1 {
  2   "name":"exampleapp",
  3   "description":"Hello Docker",
  4   "version":"0.0.1",
  5   "dependencies":{
  6     "express":"4.4.x"
  7   }
  8 }         

三、將檔案提交到開發者PC的exampleapp倉庫（其實我這一步不是很明白，不是在exampleapp目錄下建立的檔案嗎，為什麼還要提交到那個倉庫？）

[
 
[email protected] exampleapp]#  git add app.js package.json
[[email protected] exampleapp]#  git commit -m "add source"

四、編寫Dockerfile檔案

[[email protected] exampleapp]# vim Dockerfile 
  1 FROM centos
  2 
  3 RUN yum install -y nodejs npm
  4 
  5 ADD app.js /var/www/app.js
  6 ADD package.json /var/www/package.json
  7 
  8 WORKDIR /var/www
  9 RUN npm install
 10 
 11 CMD node app.js                        

ADD ：將app.js和package.json複製到映象的/var/www/目錄
RUN npm install:將安裝package.json中設定的Node,js模組
CMD node app.js 設定用於在容器啟動時利用nodejs執行app.js
nodejs是javascript的執行環境。
將Dockerfile檔案提交到開發者的exampleapp倉庫

[[email protected] exampleapp]# git add Dockerfile 
[[email protected] exampleapp]# git commit -m "add Dockerfiile"

五、在開發者PC中生成SSH金鑰

[[email protected] exampleapp]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:WnbSLwOy+EpY6oMSqKgVJbOVdL5fMvIpFIgyLZY4pdA [email protected]
The key's randomart image is:
+---[RSA 2048]----+
|... . .          |
|o+Eo =           |
|Bo= = o          |
|.= *   o .       |
|. o . = S +      |
|o  = o X O .     |
|oo+ o + + o .    |
|=o.. . .   o     |
|+ .....          |
+----[SHA256]-----+

在伺服器端

一、在伺服器中安裝Docker

[[email protected] ~]# yum  install docker-io
[[email protected] ~]# systemctl start docker

二、在伺服器中安裝SSH金鑰

在伺服器端安裝前面生成的SSH金鑰，以便開發者PC訪問伺服器時不必使用密碼

[[email protected] ~]# mkdir .ssh/
[[email protected] ~]# chmod 700 .ssh/
[[email protected] ~]# mkdir .ssh/authorrized_keys 

將開發者PC端的建立的id_rsa.pub檔案複製到伺服器端的.ssh/authorrized_keys 中，然後修改許可權

[[email protected] ~]# scp .ssh/id_rsa.pub [email protected]:.ssh/authorrized_keys 
[email protected]'s password: 
id_rsa.pub                    100%  399   328.7KB/s   00:00    

在伺服器端檢視
[[email protected] ~]# ls .ssh/
authorrized_keys  id_rsa  id_rsa.pub
[[email protected] ~]# chmod +x .ssh/authorrized_keys 

二、在伺服器端安裝Git Hook

[[email protected] ~]# vim exampleapp/.git/hooks/post-receive 

  1 #!/bin/bash
  2 
  3 APP_NAME=exampleapp(設定當前應用程式的名稱，與倉庫名稱一致)
  4 APP_DIR=$HOME/$APP_NAME(設定檢視目錄)
  5 REVISTION=$(expr substr $(git rev-parse --verify HEAD) 1 7)
  6 
  7 GIT_WORK_TREE=$APP_DIR git checkout -f
  8 
  9 cd $APP_DIR
 10 docker build --tag $APP_NAME:$REVISION .
 11 docker stop $APP_NAME
 12 docker rm $APP_NAME
 13 docker run -d --name $APP_NAME -p 80:80 $APP_NAME:$REVISION  

REVISTION=$(expr substr $(git rev-parse --verify HEAD) 1 7)
git rev-parse --verify HEAD:這句命令的作用可以參考這篇博文：http://blog.sina.com.cn/s/blog_9ca06dcc0102vrvp.html（簡單來說就是讓git知道你在哪）
expr substr：expr命令是一款表示式計算工具，使用它完成表示式的求值操作

[[email protected] ~]# expr --help
....
 substr STRING POS LENGTH   substring of STRING, POS counted from 1
  ....
  所以expr substr   $(git rev-parse --verify HEAD) (STRING)  1(POP) 7(LENGTH)
  
[[email protected] exampleapp]# expr substr $(git rev-parse --verify HEAD) 1 7
061fe9c

GIT_WORK_TREE=$APP_DIR git checkout -f
git checkout -f:用於將推送的原始碼儲存到倉庫目錄，必須設定GIT_WORK_TREE變數

三、在開發者PC中推送原始碼

[[email protected] exampleapp]# git remote add original [email protected]:exampleapp
[[email protected] exampleapp]# git push original master

四、測試

在web瀏覽器中輸入伺服器的IP地址，據說會有下圖效果。