cloudacademy/jenkins-cicd-intro

Jenkins CICD Introduction Demo Code and Configs

Jenkins CICD Introduction Demo Code and Configs

Contains Jenkins code and configuration examples as used within the Introduction to CI/CD with Jenkins course.

Demo 4: Install Jenkins - EC2 Ubuntu

Install intructions for Ubuntu 18.04

sudo -s
apt-get update
apt-get install -y openjdk-8-jdk
java -version
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
apt-get update
apt-get install -y jenkins

systemctl status jenkins
ps -ef | grep jenkins  
ufw status
ufw allow 8080

cat /var/lib/jenkins/secrets/initialAdminPassword

Demo 5: Install Jenkins - Docker Compose

mkdir jenkins-docker
cd jenkins-docker

docker network create -d bridge devnetwork

docker-compose.yml

version: "3.5"
services:
    jenkins:
        container_name: jenkins-docker
        image: jenkins/jenkins:lts
        ports:
            - 8080:8080
        networks:
            - devnetwork
networks:
    devnetwork:
        name: devnetwork

docker-compose config

docker-compose up -d && docker-compose logs -f

docker ps

docker exec -it jenkins-docker bash

docker exec -it jenkins-docker /var/lib/jenkins_home/secrets/initialAdminPassword 

Demo 6: Create Basic Freestyle Project

UI instructions only

Demo 7: Create Basic Freestyle Project

UI instructions only

Demo 8: Building a GitHub Stored Project

Refs https://github.com/cloudacademy/react-webapp

Notes:

• this demo assumes yarn (1.22.x) and node (8.x) have already been installed and is available on the host that the Jenkins service is running on.
• node version 8.x is required for the yarn build to complete successfully

Install and Setup yarn and node locally (MacOS)

If you are running Jenkins locally on MacOS then perform the following instructions to install yarn and node

brew install yarn
yarn --version
which yarn

brew install n
sudo n 8.10.0
node --version
which node

Jenkins Script

Update the PATH and preappend /usr/local/bin to it - so that yarn can be found by the Jenkins service when the build is executed

PATH=/usr/local/bin:$PATH
echo $PATH
yarn --version
node --version
yarn install
yarn build
ls -la
echo finished!!

Demo 9: Build Triggers with GitHub Hooks

Documentation https://api.github.com/meta

Refs https://github.com/cloudacademy/react-webapp

Demo 13: Build Pipelines - Maven

Uses provided sample pipeline within the Jenkins UI

Demo 14: Build Pipelines - Scripted

def int fibonacci(int n){
    n < 2 ? n : fibonacci(n-1) + fibonacci(n-2)
}

node{
    def workspace = pwd()
    echo "workspace = ${workspace}"

    def nine = 9
    def ten = nine + 1

    stage('Calculate'){
        try{
            if(ten > nine){
                echo "${fibonacci(ten)}"
                sh returnStdout: true, script: 'script-which-doesnt-exist.sh'
            }
        }
        catch(exc){
            echo "some exception just happened!!" 
        }

    }
}

Demo 15: Build Pipelines - Gradle

Refs https://github.com/cloudacademy/devops-webapp

Website https://crontab.guru/

H/5 * * * *

//START-OF-SCRIPT
node {
    def GRADLE_HOME = tool name: 'gradle-4.10.2', type: 'hudson.plugins.gradle.GradleInstallation'
    sh "${GRADLE_HOME}/bin/gradle tasks"

    stage('Clone') {
        git url: 'https://github.com/cloudacademy/devops-webapp.git'
    }

    stage('Build') {
        sh "${GRADLE_HOME}/bin/gradle build"
    }

    stage('Archive') {
        archiveArtifacts 'build/libs/*.war'
    }
}
//END-OF-SCRIPT

sudo apt-get install -y tree
cd /var/lib/jenkins/workspace/BuildJob6
ls -la
cd build
tree

====================

Demo 16: Build Pipelines - Declarative

Refs https://github.com/cloudacademy/devops-webapp

pipeline {
    agent {
        label 'master'
    }
    tools {
        gradle 'gradle-4.10.2'
    }
    environment {
        VERSION = "jellybean"
    }
    stages{
        stage('Checkout') {
            steps {
                checkout([$class: 'GitSCM',
                    branches: [[name: 'master']],
                    extenstions: [[$class: 'WipeWorkspace']],
                    userRemoteConfigs: [[url: 'https://github.com/cloudacademy/devops-webapp.git']]

                ])
            }
        }
        stage('Details') {
            steps {
                echo "Running ${env.BUILD_ID} on ${env.JENKINS_URL}"
                echo "${env.VERSION}"
            }

            when {
                environment name: 'VERSION', value: 'jellybean'
            }
        }
        stage('Build') {
            steps {
                sh "gradle build"
            }
        }
    }
}