Let's make a complete CI/CD project for your Node JS Application.

Task-01

Fork this repository:

Create a connection to your Jenkins job and your GitHub Repository via GitHub Integration.

we will use Personal Access Token for integrating your Jenkins and Github.

For Installing GitHub Integration plugin in Jenkins

Open your Jenkins dashboard.
Click on the Manage Jenkins button on your Jenkins dashboard
Click on Manage Plugins
Install the GitHub Integration plugin

To integrate your Jenkins and GitHub go to configure the system in the manage Jenkins tab. Find the GitHub section and add the GitHub server.

Add Jenkins credentials, use secret text in which you will add your Github Personal Access Token

Select your credentials from the dropdown menu of credentials and test the connection.

You can see that your GitHub is connected to the Jenkins server and your GitHub user name is displayed. Save the changes, by now you have integrated your Jenkins and GitHub successfully.
Read About GitHub WebHooks and make sure you have a CICD setup

Task-02

Creating a new Freestyle Project for the node.js application

go to the dashboard and create a new job.

Configure your project-

-Give it a description.

-Select the GitHub project in general and add your repository URL to the project URL.

-In the Source Code Management, select git and add the details asked, leave the credentials section as we have already provided the credentials and it will automatically take the credentials.

-Specify the branch.

You will have to make a Docker Compose file for this Project

In the Build Steps section, Execute the shell to run the application using Docker Compose.

here, I am running sudo docker-compose down command first to stop the processes running on this port and then running sudo docker-compose -d up to run the application.