Docker 运行错误：/bin/sh: 1: python: not found

Question

So, im trying to learn docker and tried making a simple image to try it out. The docker build part goes well but when I docker run, I get a problem:

(base) daniellombardi@Daniels-MacBook-Pro MyApp-test % docker run bd
/bin/sh: 1: python: not found

The Dockerfile:

FROM ubuntu

RUN apt-get update && apt-get install -y python3 python3-pip

RUN pip3 install flask

RUN mkdir /MyApp-test

ADD folder /opt/MyApp-test

EXPOSE 5000

CMD python .main.py

and for anyone wondering, this is the code on main.py

from flask import Flask

app = Flask(__name__)


@app.route('/')
def index():
    return 'IT WORKED! I AM RUNNING FROM A DOCKER CONTAINER!!!'


if __name__ == '__main__':
    app.run(host="0.0.0.0", port=5000)

Answer 1

Since you are only install python3 inside the docker image as shown here

RUN apt-get update && apt-get install -y python3 python3-pip

So you will need to run python3 instead of python in this line: CMD python .main.py

And you have a typo in the script name. It should be main.py instead of .main.py . Or it should be ./main.py

So change it to CMD python3 ./main.py

And if you still have error, you probably need to add this line in the Dockerfile above line of EXPOSE 5000 :

WORKDIR /opt/MyApp-test