What is the method for packaging the python flask project into a docker image for release?

1. Write python flask code, simply write an addition interface, named sum.py

import json
from flask import Flask,request,render_template
app = Flask(__name__)
@app.route('/')
def index():
    return 'hello world'
@app.route('/sum',methods=['POST'])
def correct():
   a= request.json['a']
   b=request.json['b']
   sum=int(a)+int(b)
   print(sum)
   result={"sum:":sum}
   return result
 
if __name__ == '__main__':
    app.run(host="0.0.0.0",port=5000)

2. To package it into a mirror, you must write out what dependencies are needed. Pipreqs

is recommended here

--Run the command pip install pipreqs (if not installed)

--Run the command pipreqs ./ --encoding=utf8 --force

You can see that requirements are generated in the directory .txt

3. Write the dockerfile

FROM python:3.7
 
COPY . /app/
 
RUN pip install -r /app/requirements.txt
 
WORKDIR /app
 
EXPOSE 5000
 
CMD [ "python","sum.py" ]

After executing the first three steps, the entire code directory structure is as shown in the figure

4. Packaging image

--Execute the command docker build -f Dockerfile -t pyhonflask .

Available after the operation is completed Docker images command to view the packaged image

## 5. Run the image

I used docker desktop to run it directly

Check docker startup status

6. Verification interface

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