unattended_jenkins_image_build

Customized jenkins image build Dockerfile that lets you build a Jenkins docker image with (but not limited to) the following use cases:

Disable Jenkins Install Setup Wizard (JAVA_OPTS "-Djenkins.install.runSetupWizard=false"), and install the suggested plugins as seen by the setup wizard
Install a list of useful plugins, examples: periodicbackup, monitoring (JavaMelody), green-ball button,...
Groovy init scripts to be placed in reference (/usr/share/jenkins/ref/init.groovy.d) folder and later be copied to $JENKINS_HOME/init.grooy.d to:

The build script makes use of bash shell functions to download/install awscli v2 (in container), and terraform binary so as to be copied to jenkins docker image
The jenkins docker image also includes typical tools including curl, git, jq, maven, tree, wget, zip, python3, pip3, ansible 2.9.10, jinja2, dnspython

How to build the image

"git clone https://github.com/garyttt/unattended_jenkins_image_build.git jenkins" using an account with uidNumber=1000 (jenkins)
cd jenkins/
edit all .sh scripts, replace 'REPO=garyttt8' (my Docker Hub account) with your Docker Hub account 'REPO=yourdockerhubaccount'
edit 01_set_baseURL.groovy, replace hostname in 'location.url' with your actual docker hostname
./jenkins_image_build.sh TAG --progress=plain where TAG is the docker image tag you so desired, I tend to tally it with the "FROM jenkins/jenkins:TAG" in dockerfile, example: TAG is 2.449-jdk17
go for a 30-min or so coffee break, preferably you rebuild during non-peak/lunch hour
you may inspect the docker_build.log post build for errors, note that warnings could usaully be ignored

./jenkins_run.sh TAG where TAG is the docker tag you have assigned to jenkins image, it is actually restarting jenkins, i.e. it calls ./jenkins_stop.sh first
docker run log file will be fetched continuously, you may Ctrl-C to break it

http://hostname:8080 (HTTP) or http://hostname:8080/jenkins if "--prefix=/jenkins is set in 'env JENKINS_OPTS'" in dockerfile, https://hostname:8083 (HTTPS) or http://hostname:8083/jenkins if "--prefix=/jenkins is set in 'env JENKINS_OPTS'" in dockerfile. Please note it would take at least few minutes for browser to fully launch jenkins. Replace hostname with actual docker hostname, please change admin password ASAP

refer to 'Jenkins_Period_Backup_Config_Example.pdf' to quickly configure it, do not forget to validate cron syntax and existence of backup folder
take a on-demand config backup whenever you have made changes and note down the timestamp (drop list of recent timestamps is shown when you click 'restore')
if you even re-build the image and need the previous config. perform a restore

first run 'generate_self_signed_jks.sh', then un-comment the related lines in dockerfile, re-build the image, as well as copy/paste the right lines in jenkins_run.sh, re-run to test

You may automate these groovy scripts using JCasC Jenkins Configuration As Code plugin