Docker 生成Node.js web app(含端口映射)

1.新建目录src，并进入src目录

[xiejdm@localhost Documents]$ mkdir src
[xiejdm@localhost Documents]$ cd src/

2.创建package.json和index.js文件，文件内容如下：

package.json

[xiejdm@localhost Documents]$ mkdir src
[xiejdm@localhost Documents]$ cd src/
[xiejdm@localhost src]$ cat package.json
{
  "name": "docker-centos-hello",
  "private": true,
  "version": "0.0.1",
  "description": "Node.js Hello world app on CentOS using docker",
  "author": "Gideon xie <xiejdml@gmail.com>",
  "dependencies": {
    "express": "3.2.4"
  }
}

index.js

[xiejdm@localhost src]$ cat index.js
var express = require('express');

// Constants
var PORT = 8080;

// App
var app = express();
app.get('/', function (req, res) {
res.send('Hello world\n');
});

app.listen(PORT);

3.创建Dockfile

[xiejdm@localhost src]$ cat Dockerfile
FROM    centos:centos7

# Enable EPEL for Node.js
RUN     yum install -y epel-release
# Install Node.js and npm
RUN     yum install -y npm

# Bundle app source
COPY . /src
# Install app dependencies
RUN cd /src; npm install

EXPOSE
CMD ["node", "/src/index.js"]
[xiejdm@localhost src]$ 

4.使用docker build构建生成镜像

[xiejdm@localhost src]$ docker build -t gideon/centos-node-hello .
Sending build context to Docker daemon 4.096 kB
Sending build context to Docker daemon
Step  : FROM centos:centos7
 ---> 7322fbe74aa5
Step  : RUN yum install -y epel-release
 ---> Running in 858c0e3e9a22
Loaded plugins: fastestmirror
Determining fastest mirrors
 * base: mirrors.yun-idc.com
 * extras: mirrors.yun-idc.com
 * updates: mirrors.nwsuaf.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch :- will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                Arch             Version         Repository        Size
================================================================================
Installing:
 epel-release           noarch           -             extras             k

Transaction Summary
================================================================================
Install   Package

Total download size:  k
······
······
······
npm http  https://registry.npmjs.org/qs/-/qs-0.6.4.tgz
npm WARN engine formidable@1.0.: wanted: {"node":"<0.9.0"} (current: {"node":"v0.10.36","npm":"1.3.6"})
express@3.2. node_modules/express
├── methods@0.0.
├── fresh@0.1.
├── range-parser@0.0.
├── cookie-signature@1.0.
├── buffer-crc32@0.2.
├── cookie@0.0.
├── commander@0.6.
├── mkdirp@0.3.
├── send@0.1. (mime@1.2.)
├── debug@2.2. (ms@0.7.)
└── connect@2.7. (pause@0.0., qs@0.6., bytes@0.2., formidable@1.0.)
 ---> 66738118fe5d
Removing intermediate container cad428ec3167
Step  : EXPOSE
 ---> Running in 9ee7937e5835
 ---> f6ccd16494ac
Removing intermediate container 9ee7937e5835
Step  : CMD node /src/index.js
 ---> Running in 9ca19e7392e9
 ---> ae5f980eea52
Removing intermediate container 9ca19e7392e9
Successfully built ae5f980eea52
[xiejdm@localhost src]$ 

5.查看我的镜像

[xiejdm@localhost src]$ docker images
REPOSITORY                 TAG                 IMAGE ID            CREATED              VIRTUAL SIZE
gideon/centos-node-hello   latest              ae5f980eea52        About a minute ago    MB
nodejs_hello/node          latest              2daac5743daa         minutes ago       544.7 MB
gideon/nodejs              latest              f30730d7c260         days ago           544.7 MB
nginx                      latest              6886fb5a9b8d         days ago           132.8 MB
ubuntu                     latest              d2a0ecffe6fa         weeks ago          188.3 MB
centos                     centos7             7322fbe74aa5         weeks ago          172.2 MB
centos                     latest              7322fbe74aa5         weeks ago          172.2 MB
hello-world                latest              91c95931e552         months ago          B
[xiejdm@localhost src]$ 

6.运行刚刚生成的镜像，并将容器的8080端口映射到主机的49161端口

[xiejdm@localhost src]$ docker run -p : -d gideon/centos-node-hello
71baf591eb27a2373daf5a802ee9406e635878ee1b1fcd047eb3f39e476b4406
[xiejdm@localhost src]$ 

7.在本机输入localhost:49161，访问helloword应用。

备注： CentOS 7中增加EPEL库，直接使用yum install epel-release即可（CentOS 5/6则需要下载对应的rpm包然后进行安装）。

参考：http://docs.docker.com/examples/nodejs_web_app/

　　  http://www.rackspace.com/knowledge_center/article/install-epel-and-additional-repositories-on-centos-and-red-hat