Docker 构建挂起

Question

I am trying to build a Docker Img for a python program(It's a telegram Bot from FreeCodeCamp ), Now the code runs perfectly but when I try to build this Dockerfile

FROM python:3.6
COPY . /app

WORKDIR /app

RUN pip install -r requirement.txt

ENV PORT 8080

ENV HOST 0.0.0.0

RUN ["python","bot.py"]

The system hangs.

dishant_sonawane17@cloudshell:~/project (voice-261819)$ docker build -t python-docker-dev .
Sending build context to Docker daemon  4.608kB
Step 1/7 : FROM python:3.6
 ---> e0373ff33a19
Step 2/7 : COPY . /app
 ---> Using cache
 ---> 6f9396ff2a64
Step 3/7 : WORKDIR /app
 ---> Using cache
 ---> 1c216f1a529c
Step 4/7 : RUN pip install -r requirement.txt
 ---> Using cache
 ---> 531e40ac101d
Step 5/7 : ENV PORT 8080
 ---> Using cache
 ---> 385b36f30518
Step 6/7 : ENV HOST 0.0.0.0
 ---> Using cache
 ---> b1ba2f0bf26e
Step 7/7 : RUN ["python","bot.py"]
 ---> Running in 5ceec7069ee9

Answer 1

Not sure what your bot.py will do, but it will run and wait to finish... It looks like you want bot.py to be the application to start once the container is started.

You should use ENTRYPOINT or CMD for this.

In a nutshell:

• RUN executes command(s) in a new layer and creates a new image. Eg, it is often used for installing software packages.
• CMD sets default command and/or parameters, which can be overwritten from command line when docker container runs.
• ENTRYPOINT configures a container that will run as an executable.

More detailed explanation/source: https://goinbigdata.com/docker-run-vs-cmd-vs-entrypoint/ .