I was for this solution for months. Almost any guide I’ve found was about using an official Docker image with few plugins installed. It works pretty well if you agree with a manual initial configuration like configure admin user and password. It doesn’t work at all if you deploy Jenkins in an automated way.
Here is a Dockerfile to get installed and ready to use Jenkins:
FROM jenkins/jenkins:lts
# https://github.com/jenkinsci/docker/blob/master/README.md
# Jenkins configuration
ENV JAVA_OPTS="-Djenkins.install.runSetupWizard=false"
COPY security.groovy /usr/share/jenkins/ref/init.groovy.d/security.groovy
# Jenkins plugins
COPY plugins.txt /usr/share/jenkins/ref/plugins.txt
RUN /usr/local/bin/install-plugins.sh < /usr/share/jenkins/ref/plugins.txt
security.groovy content:
#!groovy
import jenkins.model.*
import hudson.security.*
import jenkins.security.s2m.AdminWhitelistRule
def instance = Jenkins.getInstance()
def hudsonRealm = new HudsonPrivateSecurityRealm(false)
hudsonRealm.createAccount("admin", "admin")
//def user = new File("/run/secrets/jenkins-user").text.trim()
//def pass = new File("/run/secrets/jenkins-pass").text.trim()
instance.setSecurityRealm(hudsonRealm)
def strategy = new FullControlOnceLoggedInAuthorizationStrategy()
instance.setAuthorizationStrategy(strategy)
instance.save()
Jenkins.instance.getInjector().getInstance(AdminWhitelistRule.class).setMasterKillSwitch(false)
Of course, I don’t use this login/password pair for my instances :).
The original post is here. I’m coping it to my blog just to not forget about it because I don’t like notes, favorites in a browser and so on.