I am trying to create a docker image from my docker file which has the following content:

FROM ubuntu:latest 
WORKDIR /app 
ADD . /app 
RUN apt-get update && apt-get install python -y 
CMD python /app/main.py 
LABEL color=red

which fails with the following error:

apt-get update && apt-get install python -y returned a non-zero code: 100

So please help me in solving this error

CodePudding user response：

Docker is just Linux. When some apt-get install acme fails, you just need to try the exact command and or research the missing dependencies.

To replicate your error I ran: docker run -it ubuntu:latest and inside, I ran your apt-get update && apt-get install python -y. I got the error:

So, I tried with apt-get install python3 -y and it worked. Finally your Dockerfile should be:

FROM ubuntu:latest 
WORKDIR /app 
ADD . /app 
RUN apt-get update && apt-get install python3 -y 
CMD python3 /app/main.py 
LABEL color=red

Older Python

If your code needs old python version, you should not use FROM ubuntu:latest because in the lastest version of ubuntu, only python3 is allowed.

Anyway if you need python2, you must research a lot on internet to get the exact steps to install python2 or use some ready to use docker images:

• https://hub.docker.com/layers/python/library/python/2.7.18-slim-stretch/images/sha256-a0b3c65a15ba08138460de9fd2267b8dec30ed98407a0edac0adc0ccbe809cad?context=explore
• how do i setup only python 2.7 in docker container?
• https://github.com/Docker-Hub-frolvlad/docker-alpine-python2

CodePudding user response：

You should post all the output because maybe for some reason you use different apt sources than the official once.

However you need to give automatic consent to install:

apt-get install -y python

otherwise the command is waiting for you to approve.