Dockerfile文件制作自己的镜像

1.创建空目录

$ cd /home/xm6f/dev 
$ mkdir myapp
$ cd myapp/

2.vim Dockerfile，内容如下：

## 一个基础的 python 运行环境
FROM python
## 设置工作目录
WORKDIR /app
## 将当前系统文件夹内容复制到容器的 app 目录
ADD . /app
## 安装必要的依赖包
RUN pip install -r softwares.txt
## 开放端口，供容器外访问

EXPOSE 80
EXPOSE 3088
EXPOSE 8080
EXPOSE 8066

## 定义环境变量
ENV NAME HELLO
## 运行命令
CMD ["python","app.py"]

3.安装依赖
vim softwares.txt，内容如下：

Flask
Redis

4.vim app.py，内容如下：

from flask import Flask
from redis import Redis, RedisError
import os
import socket
# Connect to Redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
app = Flask(__name__)
@app.route("/")
def hello():
    try:
        visits = redis.incr("counter")
    except RedisError:
        visits = "<i>cannot connect to Redis, counter disabled</i>" 
    html = "<h3>Hello {name}!</h3>" 
           "<b>Hostname:</b> {hostname}<br/>" 
           "<b>Visits:</b> {visits}"
    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)
if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)

5.编译

$ docker build -t myfirstapp .

6.查看新生成了一个image

$ docker images
REPOSITORY                   TAG                 IMAGE ID            CREATED             SIZE
myfirstapp                   latest              01ea1129a831        2 hours ago         699MB

7.启动image

$ docker run -p 4000:80 myfirstapp 
也可以放在后台运行:
$ docker run -d -p 4000:80 myfirstapp

8.访问服务

# curl http://localhost:4000
<h3>Hello world!</h3><b>Hostname:</b> a6655d0d7e74<br/><b>Visits:</b> <i>cannot connect to Redis, counter disabled</i>

或者浏览器访问服务：http://192.168.1.160:4000

9.查看当前运行的镜像

$ docker ps
CONTAINER ID MAGE          COMMAND            CREATED       STATUS       PORTS                  NAMES
2db45cab2bb4 myfirstapp    "python app.py"  2 minutes ago Up 2 minutes 0.0.0.0:4000->80/tcp   elastic_wilson

10.停止镜像

$ docker stop 2db45cab2bb4