如何在 Docker Compose 容器中升级到 Python3+

Question

I have a simple docker compose file which is just Jenkins and MongoDB.

    version: '3.7'
services:
  jenkins:
    image: jenkins/jenkins:lts
    privileged: true
    user: root
    ports:
      - 8081:8080
      - 50000:50000
    container_name: jenkins
    volumes:
      - ./Docker/FS/jenkins:/var/jenkins_home
      - ./Docker/FS/var/run/docker.sock:/var/run/docker.sock
      - ./Docker/FS/usr/local/bin/docker:/usr/local/bin/docker
      - ../Data:/var/DataHome
  mongodb:
    image: 'mongo'
    container_name: 'mongodb_container'
    volumes:
      - ./Docker/FS/MongoDB:/data/db 
    ports:
      - '27017-27019:27017-27019'

When trying to run a command in jenkins, I noticed that it is running Python 2.7, which isn't ideal.

Is there a simple way to upgrade that to python3+?

Do I have to create a new image to do this? Can you combine multiple images?

Answer 1

You can create a new image with a Dockerfile

FROM jenkins/jenkins:latest

RUN <cmd to remove python2> && <cmd to install python3>

CMD <cmd to launch your main process>

I make the assumption that changing python version does not impact jenkins at all. It might not be the case.