『中级篇』Dockerfile实战（19）

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如何从一个python程序打包成为image，然后上传到dockerhub，最后下载image，生成对应的container容器。走咱们一起走个流程下来。

python程序

• 编写python程序

mkdir flask-hello-world
cd flask-hello-world/
vim app.py

from flask import Flask
app = Flask(__name__)
@app.route('/')
def hell():
        return "hello docker public attention:idig88"
if __name__=='__main__':
        app.run(port=8888)

• 运行python程序

python app.py

#安装flask插件
sudo yum -y install epel-release
sudo yum -y install python-pip
pip install flask
python app.py

编写Dockerfile文件

vim Dockerfile

FROM python:2.7
LABEL maintainer="zhugeaming"
RUN mv /etc/apt/sources.list /etc/apt/sources.list.bak
RUN echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib" >/etc/apt/sources.list
RUN echo "deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
RUN echo "deb-src http://mirrors.163.com/debian/ jessie main non-free contrib" >>/etc/apt/sources.list
RUN echo "deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
RUN apt-get update
RUN pip install flask
COPY app.py /app/
WORKDIR /app
EXPOSE 8888
CMD ["python","app.py"]

docker image ls

运行container

docker run zhugeaming/flask-hello-world

#后台运行
docker run -d zhugeaming/flask-hello-world

容器有2个一个是刚才执行，一个后台执行的，后台直接执行。不加入-d的已经退出了。

PS：本次就是做了个实战，通过四步
1. 代码编写好
2. 环境python环境
3. 第三方依赖
4. 执行命令