docker getting stopped, how to launch a background process

[Eser Kandogan]

Hi,

As part of my jenkins pipeline I would like to launch a server in a docker image but it seems docker is stopped when/if the last command is put in background. How can I fix this? Here is the Jenkinsfile:

node {

    checkout scm

    def backendImage = docker.build("backend-image", "./images/backend")

    sh 'export JENKINS_NODE_COOKIE=dontKillMe'

    backendImage.inside('-p 3000:3000 -p 4000:4000') {

          echo "BUILDING BACKEND"

          echo "----------------"

          echo "STEP1: INSTALLING REQUIREMENTS..."

          sh 'pip install -r requirements.txt'

          echo "STEP2: TESTING..."

          sh 'python test.py'

          echo "STEP3: START PRODUCTION SERVER"

          sh 'export JENKINS_NODE_COOKIE=dontKillMe'

          sh 'nohup python app.py -p 3000 >> app.prod.log &'

    }

}

In above if I remove the & in nohup call the pipeline never finishes but the process runs. If I add an & at the end the docker is stopped and removed. I see the following in command output:

+ nohup python app.py -p 3000
[Pipeline] }
$ docker stop --time=1 e33a650bab7c565148899e28f229a0ec19577b1701227cc89b52752b851a34be
$ docker rm -f e33a650bab7c565148899e28f229a0ec19577b1701227cc89b52752b851a34be

Dockerfile in images/backend is:

FROM python:3.7

MAINTAINER Eser Kandogan "..."

RUN apt-get update -y && \

    apt-get install -y python-pip python-dev