Continuous Integration and deployment (CI/CD Pipeline) with Jenkins and Node.js

Setting up a Continuous Integration and Continuous Deployment (CI/CD) pipeline with Jenkins and Node.js involves automating the testing and deployment processes for your Node.js applications. Here's a step-by-step guide to help you achieve this:

Prerequisites:

1. Jenkins Installed:

   Ensure that Jenkins is installed on your server. You can download Jenkins from the official website: Jenkins Download.

2. Node.js Installed:

   Make sure Node.js is installed on the server where Jenkins is running.

1. Install Jenkins Plugins

   Jenkins requires specific plugins to work with Node.js and Git. Install the following plugins:

   • NodeJS Plugin: Allows you to use Node.js in your build processes.
   • Git Plugin: Integrates Jenkins with Git repositories.

   Install these plugins from the Jenkins dashboard by navigating to Manage Jenkins > Manage Plugins > Available and search for the plugins.

2. Set Up Node.js in Jenkins
   1. Navigate to Manage Jenkins > Global Tool Configuration.
   2. Look for the section named NodeJS and click on NodeJS Installations....
   3. Add a new NodeJS installation and provide the necessary details, including the name and the path to the Node.js executable. Save your changes.
3. Create a New Jenkins Job
   1. Click on New Item on the Jenkins dashboard.
   2. Enter a name for your project and select Freestyle project.
   3. Under the Source Code Management section, choose Git and provide the repository URL.
   4. In the Build section, add a build step:
      • Choose Invoke NodeJS as the build step.
      • Select the Node.js version you configured earlier.
      • Add the build script, e.g., npm install or yarn install.
4. Set Up Testing

   Add a testing step to your Jenkins job. Depending on your testing framework (e.g., Jest, Mocha), add the corresponding test command in the build steps. For example:

                   
                       npm test
                   
               

5. Set Up Deployment
   1. In the Jenkins job configuration, add a post-build action.
   2. Choose Send build artifacts over SSH.
   3. Configure the SSH server details where your Node.js application will be deployed.
   4. Specify the source files to be deployed, e.g.,**/*.js or the entire project.
6. Webhook Setup (Optional)

   If you want Jenkins to trigger builds automatically whenever you push changes to your Git repository, set up a webhook:

   1. In your Git repository, go to Settings > Webhooks.
   2. Add a new webhook with the Jenkins build trigger URL.
7. Save and Build

   Save your Jenkins job configuration and manually trigger a build to ensure everything is set up correctly. If the build and tests pass, the application will be deployed automatically.

8. Monitor Builds

   Monitor your Jenkins dashboard for build results. If the pipeline is set up correctly, Jenkins will automatically trigger builds on new commits.

Remember that this is a basic setup. Depending on your project's complexity, you may need to customize the pipeline further, possibly integrating additional tools such as Docker for containerization or other testing tools.

Always refer to the Jenkins documentation for detailed information on plugins and configuration options: Jenkins Documentation.

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