Install docker

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

# Add the repository to Apt sources:
echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

Install docker

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Set the permissions on ubuntu host

sudo usermod -a -G docker jenkins
sudo chown jenkins:docker /var/run/docker.sock
sudo chmod 660 /var/run/docker.sock

Install docker and docker pipeline plugin from manage jenkins

Lab 1: with single agent

pipeline {
agent {
docker { image 'node:18.18.0-alpine3.18' }
  }
stages {
 stage('Test') {
  steps {
   sh 'node --version'
     }
   }
  }
}

Docker Volumes to mount, which can be used for caching data on the agent between Pipeline runs. The following example will cache ~/.m2 between Pipeline runs utilizing the maven container, avoiding the need to re-download dependencies for subsequent Pipeline runs.

lab2:

pipeline {
agent {
  docker {
    image 'maven:3.9.3-eclipse-temurin-17'
    args '-v $HOME/.m2:/root/.m2'
   }
  }
stages {
  stage('Build') {
   steps {
    sh 'mvn --version'
    }
  }
 }
}

Combining Docker and Pipeline allows a Jenkinsfile to use multiple types of technologies, by combining the agent {} directive with different stages.

lab3:

pipeline {
agent {
docker {
image 'maven:3.9.3-eclipse-temurin-17'
args '-v $HOME/.m2:/root/.m2'
}
}
parameters {
choice(
name: 'ENVIRONMENT',
choices: ['dev', 'qa', 'prod'],
description: 'Select the deployment environment'
)
}
stages {
stage('SCM code') {
steps {
git 'https://github.com/hellokaton/java11-examples.git'
}
}
stage('Build') {
steps {
sh 'mvn clean package'
}
}
stage('Test') {
steps {
sh 'mvn test'
}
}
stage('Deploy') {
when {
expression { params.ENVIRONMENT == 'prod' }
}
steps {
// Add steps to deploy the application for 'prod'
echo 'Deploying to production...'
}
}
}
post {
success {
echo 'Pipeline succeeded!'

// Add additional success steps if needed
}
failure {
echo 'Pipeline failed!'

// Add additional failure steps if needed
}
}
}

lab4:

Create Dockerfile [add to git]

FROM node:20.17.0-alpine3.20

RUN apk add -U subversion

Create jenkinsfiledoc [add to git]

pipeline {
agent { dockerfile true }
stages {
stage('Test') {
steps {
sh 'node --version'
sh 'svn --version'
}
}
}
}