Jenkins CICD with GitHub Integration…

Jatin Batra

5 min readApr 14, 2023

What is Jenkins???

Jenkins is a tool that is used for automation.
Its an open-source server that allows all the developers to build, test and deploy software.
It works or runs on java as it is written in java.
By using Jenkins we can make a continuous integration and continuous delivery/deployment of projects or end-to-endpoint automation.

What is GitHub???

GitHub is a code hosting platform for collaboration and version control.
GitHub lets us work together on projects.
A GitHub repository can be used to store a development project.
It can contain folders and any type of files (HTML, CSS, JavaScript, Documents, Data, Images).

Step1: Launch an AWS Instance-

Launch a new instance with any name(ex- Jenkins_project).
Select Ubuntu under AMI and t2.micro in Instance Type.
Create new key pair and attached under key pair name.
Tick Allow HTTPS, HTTP traffic from internet.
Hit Launch Instance.

NOW OUR INSTANCE IS READY TO WORK :))

Step2: Install Jenkins and docker in it-

Create a script having below code and run that script to download jenkins and docker.
vim install.sh

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   #This will install jenkins in our machine.
sudo apt-get install docker.io    #This will install docker in our machine
sudo usermod -aG docker $USER     #This will provide docker privilege to running user by adding user into docker group.
sudo usermod -aG docker jenkins   #This will provide docker privilege to jenkins by adding user into docker group.
sudo reboot                       #Reboot our machine.

 #After all steps are executed, reconnect your instance.

chmod +x install.sh
bash ./install.sh

Step3: Configure Jenkins-

Enter your instance public ip on browser and you will get below interface.

Open Instance and run-> vim “path_of_initialAdminPassoword” and you will get password.
Paste the password and Install suggested plugins.

Step4: Create first job on Jenkins-

From the Jenkins interface home, select New Item and enter any name and select Freestyle Project and hit Ok.

Under Source Code Management Section, click git and add your repo url.

GitHub - devops-4u/node-todo-cicd: This is node-todo for pipeline

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github.com

Now, run ssh-keygen in your instance so that it will generate public private key to create connection between github and jenkins.
go inside the directory where key is stored, cd .ssh

id_rsa is our private key and id_rsa.pub is our public key.

Now, we have to give our public key to github and private key to jenkins.
Run, cat id_rsa.pub and paste that key into github.

Login into GitHub -> Open setting -> Under Access Section Click on SSH and GPG keys -> Add SSH Key

Run cat id_rsa and paste that key into jenkins credentials.
Under Source code Management, add credentials -> Jenkins -> Under kind select SSH with private key, inside private key tick enter directly and enter your private key -> Hit Add.
Under Build Triggers Section, tick GitHub hook trigger for GITScm polling.
Now, Add build step under execute shell.

docker build . -t node-jatin-app       #This will build image from dockerfile with name node-jatin-app
docker run -d --name node-ctr1 -p 8000:8000 node-jatin-app   #This will run container with name node-ctr1 ,-p = mapping container port with application port, -d = daemon mode i.e in background

Click on apply and Save.
Now, add “git integration plugin” in jenkins.

Manage jenkins → manage plugins -> Available Plugins -> search github integration.

Add Webhook to integrate github, Open Repo setting -> Webhook -> Add Webhook -> enter jenkins url(http://”PublicIP”:8080/github-webhook) inside payload url , select application/json under content type -> Click on Add Webhook.