YouTube Link

For the full 1 hour course watch on youtube: https://www.youtube.com/watch?v=6YZvp2GwT0A

Installation

Build the Jenkins BlueOcean Docker Image (or pull and use the one I built)

docker build -t myjenkins-blueocean:2.414.2 .

#IF you are having problems building the image yourself, you can pull from my registry (It is version 2.332.3-1 though, the original from the video)

docker pull devopsjourney1/jenkins-blueocean:2.332.3-1 && docker tag devopsjourney1/jenkins-blueocean:2.332.3-1 myjenkins-blueocean:2.332.3-1

Create the network 'jenkins'

docker network create jenkins

Run the Container

MacOS / Linux

docker run --name jenkins-blueocean --restart=on-failure --detach \
  --network jenkins --env DOCKER_HOST=tcp://docker:2376 \
  --env DOCKER_CERT_PATH=/certs/client --env DOCKER_TLS_VERIFY=1 \
  --publish 8080:8080 --publish 50000:50000 \
  --volume jenkins-data:/var/jenkins_home \
  --volume jenkins-docker-certs:/certs/client:ro \
  myjenkins-blueocean:2.414.2

Windows

docker run --name jenkins-blueocean --restart=on-failure --detach `
  --network jenkins --env DOCKER_HOST=tcp://docker:2376 `
  --env DOCKER_CERT_PATH=/certs/client --env DOCKER_TLS_VERIFY=1 `
  --volume jenkins-data:/var/jenkins_home `
  --volume jenkins-docker-certs:/certs/client:ro `
  --publish 8080:8080 --publish 50000:50000 myjenkins-blueocean:2.414.2

Get the Password

docker exec jenkins-blueocean cat /var/jenkins_home/secrets/initialAdminPassword

Connect to the Jenkins

https://localhost:8080/

Use Docker Container's Bash Shell

docker exec -it jenkins-blueocean bash

Installation Reference:

https://www.jenkins.io/doc/book/installing/docker/

alpine/socat container to forward traffic from Jenkins to Docker Desktop on Host Machine

https://stackoverflow.com/questions/47709208/how-to-find-docker-host-uri-to-be-used-in-jenkins-docker-plugin

docker run -d --restart=always -p 127.0.0.1:2376:2375 --network jenkins -v /var/run/docker.sock:/var/run/docker.sock alpine/socat tcp-listen:2375,fork,reuseaddr unix-connect:/var/run/docker.sock

To get Container IP Address:

docker inspect <container_id> | grep IPAddress

docker inspect <container_name> | grep IPAddress

To get TCP port:

docker inspect eloquent_williamson | grep tcp

Connecting to Docker container from Jenkins as a cloud agent

Put Docker Host URI as : tcp://172.19.0.3:2375

Creating a Docker Agent Template

Name: docker-agent-apline labels: docker-agent-alpine Docker Image: jenkins/jnlp-agent-python Instance Capacity: 2 Remote File System Root: /home/jenkins

Using my Jenkins Python Agent

docker pull devopsjourney1/myjenkinsagents:python

Using jenkins agent in a job

go to job configuration -> restrict where this project can be run -> label expression -> docker-agent-alpine Now run the job again

Running Jenkins jobs automatically

Go to job configuration -> Build Triggers -> Poll SCM -> Schedule: * /5 * * * * (put spaces around *, every 5 minutes check for changes in the repo)

Pipelines

We can use 'jenkins' file with jenkins Script writtin in groovy language
or we can write the script in the job configuration itself.
the pipeline stages might fali if it enounters error or stage above it fails.

j33l / jenkins-101