K
Q

I have created custom docker image for jenkins server If I use it to run normal docker container it gives no error but in k8s cluster CrashLoopBackOff

6/6/2021

DockerFile

FROM centos
RUN yum install java-1.8.0-openjdk-devel -y
RUN curl --silent --location http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo |  tee /etc/yum.repos.d/jenkins.repo
RUN rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
RUN yum install jenkins --nogpgcheck -y
RUN yum install jenkins -y
RUN yum install -y initscripts
CMD /etc/init.d/jenkins start && /bin/bash

the output of describing command

enter image description here

output of logs Starting Jenkins OK

-- Ajinkya Khandave
crashloopbackoff
docker
jenkins
kubernetes
kubernetes-helm

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1 Answer

6/6/2021

There isn't an init system inside a container so this isn't going to work. Likely the specific issue is that with plain Docker you are using docker run -it so there is a stdin, so bash starts in interactive mode and keeps running. In Kubernetes there is no input so bash exits immediately and the container exits with it. You can't run stuff in the background like that. Maybe just use the official jenkins/jenkins image? Or at least check out how it's built.

-- coderanger
Source: StackOverflow