jenkins-cicd

This page will guide different steps required to setup a Jenkins and its pre-requisites.

Install Java 17

sudo apt-get update

sudo apt-get install openjdk-17-jdk -y

Check Installation

• java -version

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Installing Jenkins on Ubuntu 22.04

For more details plese visit - https://pkg.jenkins.io/debian-stable/

Steps to install Jenkins

Open terminal and execute below command

curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key | sudo tee /usr/share/keyrings/jenkins-keyring.asc > /dev/null

echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] https://pkg.jenkins.io/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list > /dev/null

 sudo apt-get update

sudo apt-get install jenkins -y

Enable Jenkins Service

sudo systemctl enable jenkins

sudo systemctl start jenkins

sudo systemctl status jenkins

Get Initial Admin password

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

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Git

Installation

• sudo apt-get update
• sudo apt-get install git-core
• git --version

Generating SSH Key

• ssh-keygen ----- generate key
• eval "$(ssh-agent -s)" -- Start Agent
• ssh-add ~/.ssh/id_rsa --- Add key in agent
• cat < ~/.ssh/id_rsa.pub

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Install Maven

Download the Maven zip file at the below URL if you want to play with Maven on your local machine. If you want to use it on Jenkins then you can install Maven directly from Jenkins console.

Using package

• sudo apt-get install maven -y

##OR Using zip file

• mkdir tools
• cd tools
• wget https://dlcdn.apache.org/maven/maven-3/3.9.4/binaries/apache-maven-3.9.4-bin.zip
• unzip apache-maven-3.9.4-bin.zip

Check Installation

• mvn --version

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Upgrade Jenkins on Ubuntu

Follow the below steps to upgrade the Jenkins instance to the latest in the current lab.

STOP Jenkins Service

• sudo /etc/init.d/jenkins stop

Rename the Jenkins war file to war.old

• cd /usr/share/jenkins
• sudo mv jenkins.war jenkins.war.old

Download latest war file

• sudo wget https://updates.jenkins-ci.org/latest/jenkins.war

START Jenkins Service

• sudo /etc/init.d/jenkins start

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Git Practice commands

Below are some commands commonly used with Git to manage your code in repository.

Clone a git repo

• git clone

Create a new branch

• git branch

Switch branch

• git checkout

Create and switch branch

• git checkout -b

Push the newly created branch to the remote

• git push -u origin

Push change to remote branch

• git push

Pull change to remote branch

• git pull

Commit the change to the local branch

• git commit -m "Comment here"

Adding a file to the stage area or index

• git add filename

Remove a file to the stage area or index

• git rm --cached filename

Remove all the uncommitted changes

• git reset --hard

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Install Docker using the below URL

• https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-22-04 Run the below command to run Jenkins as a docker container
• docker run --name jenkins -p 8080:8080 -p 50000:50000 -v jenkins:/var/jenkins_home -d jenkins/jenkins:lts-jdk17
• sudo docker logs jenkins

Run SonarQube as Docker Container

• docker run -d --name sonarqube -p 9000:9000 -p 9092:9092 sonarqube

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Installing Docker

• https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-22-04