What is CI/CD?

CI or Continuous Integration is the practice of automating the integration of code changes from multiple developers into a single codebase. It is a software development practice where the developers commit their work frequently to the central code repository (Github or Stash). Then there are automated tools that build the newly committed code and do a code review, etc as required upon integration. The key goals of Continuous Integration are to find and address bugs quicker, make the process of integrating code across a team of developers easier, improve software quality and reduce the time it takes to release new feature updates.
CD or Continuous Delivery is carried out after Continuous Integration to make sure that we can release new changes to our customers quickly in an error-free way. This includes running integration and regression tests in the staging area (similar to the production environment) so that the final release is not broken in production. It ensures to automate the release process so that we have a release-ready product at all times and we can deploy our application at any point in time.

What Is a Build Job?

A Jenkins build job contains the configuration for automating a specific task or step in the application building process. These tasks include gathering dependencies, compiling, archiving, or transforming code, and testing and deploying code in different environments.

Jenkins supports several types of build jobs, such as freestyle projects, pipelines, multi-configuration projects, folders, multibranch pipelines, and organization folders.

What are Freestyle Projects ??

A freestyle project in Jenkins is a type of project that allows you to build, test, and deploy software using a variety of different options and configurations.

Task 1 :

Let's create a freestyle project todoapp in node js which will create an image

clone of the git hub repo of that project

Now let's build docker steps

Click on the "Save" button to save the project configuration.

Build the project: You can manually build the project by clicking on the "Build Now" link in the project's main page. This will start the build process and execute the steps specified in the project configuration.

This will run the build the docker file through jenkins now lets see the docker images are running or not

You can see image and container is created. also project from GitHub deploy to ubuntu EC2 instance at location /var/lib/jenkins/workspace/jenkins-project-name.

As we can see in above screenshot our docker image is running . Now lets navigate the app . Before that enable 8000 port in security groups

Now our todo app is running ....

Task-02

Create Jenkins project to run "docker-compose up -d" command to start the multiple containers defined in the compose file

Set up a cleanup step in the Jenkins project to run "docker-compose down" command to stop and remove the containers defined in the compose file.

2)In the "Build" section of the project, add a build step "docker-compose down" command to stop and remove the containers defined in the compose file. then add "docker-compose up -d" command.