本节将从零开始搭建一个docker镜像,并且运行container。
首先现在本机上搭建一个python flask,新建app.py 内容如下:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return "hello docker"
if __name__ == '__main__':
app.run()
运行环境是python 2.7
iie4bu@hostdocker:~/ddy/docker-flask$ python app.py
* Serving Flask app "app" (lazy loading)
* Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
* Debug mode: off
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
访问:
iie4bu@hostdocker:~/ddy/docker-flask$ curl -XGET http://127.0.0.1:5000/
hello docker
成功访问!
我们要将这段python程序打包到一个docker镜像中去。新建目录docker-flask,在这个目录中新建Dockerfile,内容如下:
FROM python:2.7 #FROM 表示他的基本的运行环境是python2.7
LABEL maintainer="vincent" #LABEL 表示这个作者是谁
RUN pip install flask #添加他的依赖环境
COPY app.py /app/ #将本地的一个文件拷贝到根目录下app文件夹下面,如果没有这个文件夹会自动创建
WORKDIR /app #设置当前工作目录是/app
EXPOSE 5000 # 暴露5000端口
CMD ["python" ,"app.py"] #运行python app.py程序,
构建镜像:
iie4bu@hostdocker:~/ddy/docker-flask$ docker build -t vincent/flask-hello-world .
Sending build context to Docker daemon 3.072kB
Step 1/7 : FROM python:2.7
---> 37093962fbf5
Step 2/7 : LABEL maintainer="vincent"
---> Using cache
---> 627d5ec958ce
Step 3/7 : RUN pip install flask
---> Using cache
---> d43f86c119ac
Step 4/7 : COPY app.py /app/
---> 4a82cbc4c3ab
Step 5/7 : WORKDIR /app
Removing intermediate container 0cdeca4a4933
---> 93259de7edce
Step 6/7 : EXPOSE 5000
---> Running in 277dec055ba3
Removing intermediate container 277dec055ba3
---> a6c65810538e
Step 7/7 : CMD ["python" ,"app.py"]
---> Running in 89fa40f016b6
Removing intermediate container 89fa40f016b6
---> fb540978df9e
Successfully built fb540978df9e
Successfully tagged vincent/flask-hello-world:latest
查看镜像:
iie4bu@hostdocker:~/ddy/docker-flask$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
vincent/flask-hello-world latest fb540978df9e 41 seconds ago 919MB
如果在构建的过程中有问题,可以利用中间过程产生的镜像ID进行DEBUG。命令docker run -it imageId /bin/bash
运行这个镜像:
iie4bu@hostdocker:~/ddy/docker-flask$ docker run -d vincent/flask-hello-world
d695fbafdd6e99c19849ecc96420ebe6e771207a5382a7189354f64ca7ebaa58
-d:表示后台运行container。
iie4bu@hostdocker:~/ddy/docker-flask$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d695fbafdd6e vincent/flask-hello-world "python app.py" 28 seconds ago Up 26 seconds 5000/tcp nervous_shaw
目前还无法访问。