Jenkins on docker

Welcome to the comprehensive guide on installing Jenkins on Docker. Jenkins is a open source automation server that helps in building, deploying, and automating projects.
Docker simplifies the process by providing a consistent environment across multiple systems. Let's deep dive into the process of setting up Jenkins on Docker.

Prerequisites
Before we begin, make sure you should have the following installations.

1. Docker Installed: Ensure docker is installed by typing this code on your shell.

docker --version 
Docker version 25.0.4, build 1a576c5

2.Basic Command Line Knowledge: Familiarity with command-line operations will be beneficial.

Step 1: Pulling the Docker Dind Image

docker pull docker:dind

Step 2: Create a Jenkins bridge Network

docker network create -d bridge jenkins

Step 3: Run the docker dind image

docker run \
  --name jenkins-docker \
  --rm \
  --detach \
  --privileged \
  --network jenkins \
  --network-alias docker \
  --env DOCKER_TLS_CERTDIR=/certs \
  --volume jenkins-docker-certs:/certs/client \
  --volume jenkins-data:/var/jenkins_home \
  --publish 2376:2376 \
  docker:dind \
  --storage-driver overlay2

Step 4: Now you need to Customize the official Jenkins Docker image, by executing the following two steps:
a. Create a Dockerfile with the following content:

FROM jenkins/jenkins:2.452.2-jdk17
USER root
RUN apt-get update && apt-get install -y lsb-release
RUN curl -fsSLo /usr/share/keyrings/docker-archive-keyring.asc \
https://download.docker.com/linux/debian/gpg
RUN echo "deb [arch=$(dpkg --print-architecture) \
signed-by=/usr/share/keyrings/docker-archive-keyring.asc] \
https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" > /etc/apt/sources.list.d/docker.list
RUN apt-get update && apt-get install -y docker-ce-cli
USER jenkins
RUN jenkins-plugin-cli --plugins "blueocean docker-workflow"


b. Build a new docker image from this Dockerfile, and assign the image a meaningful name, such as "myjenkins-blueocean:2.452.2-1":
docker build -t myjenkins-blueocean:2.452.2-1 .

Step 5: Run your own myjenkins-blueocean:2.452.2-1 image as a container in Docker using the following docker run command:

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:2.452.2-1

Step 5: Accessing you jenkins controller.

• Open a web browser.
• Navigate to http://localhost:8080.