"Mastering Jenkins: A Comprehensive Guide to Continuous Integration and Continuous Delivery"
Welcome back, folks! I have been learning DevOps for a few months, and I encounter new technologies and their applications every day. Since the DevOps industry is automated every day we came up with new tools every day, Jenkins is one of the automated servers, which allows you to automate various tasks in your software development workflow, such as building, testing, and deploying applications. It provides a web-based interface and supports a wide range of plugins for integrating with different tools and technologies.
Installations :
Jenkins is an open-source project so you can easily download from official docs.
https://www.jenkins.io/doc/book/installing.
Note:
Jenkins is compatible with Java versions 11 & 17, you should have OpenJDK 11 or OpenJDK 17, to run Jenkins on your local machine.
Install Jenkins.war file with your respective operating system.
see the location of the downloaded Jenkins.war file then execute
java -jar jenkins.war.It will generate one administration password copy it, paste on http://localhost:8080/
On the next screen, choose the option "Install suggested plugins" to install the recommended set of plugins. This will enable basic functionality in Jenkins.
Wait for the plugin installation to complete. Once done, you'll be prompted to create an admin user. Fill in the required details and click "Save and Continue".
Finally, you'll see the Jenkins dashboard, where you can start setting up your projects and automation workflows.
That's it! You have successfully installed Jenkins on your Windows machine. Feel free to explore the various features and capabilities offered by Jenkins for continuous integration and delivery.
Introduction:
Here is a beginner-friendly introduction to Jenkins:
Jenkins is a web-based application that can be installed on a variety of platforms, including Linux, Windows, and macOS. Once Jenkins is installed, you can start creating jobs.
A job is a set of steps that Jenkins will execute in order to build, test, and deploy your software project. You can create a job for each stage of your development pipeline, such as building the code, running the tests, and deploying the artifact to production.
To create a job, you will need to specify the following:
The name of the job
The type of job (e.g., freestyle project, pipeline project)
The steps that Jenkins should execute
For example, the following steps would create a simple freestyle project that builds and tests a Java application:
Get the code from the Git repository
Compile the code
Run the tests
Once you have created a job, you can schedule it to run at regular intervals, such as every time a change is made to the codebase. You can also manually trigger a job to run.
What is Jenkins used for?
Jenkins can be used to automate a wide range of tasks in the software development process, including:
* Building code
* Running tests
* Deploying artifacts
* Provisioning infrastructure
* Sending notifications
How does Jenkins work?
Jenkins works by creating and executing jobs. A job is a set of steps that Jenkins will execute in order to complete a task. For example, a job could be used to build a Java application, run the tests, and deploy the artifact to production.
How to use Jenkins:
To use Jenkins, you will first need to create a job. You can do this by clicking on the "New Job" button in the Jenkins web interface.
Once you have created a job, you will need to configure the steps that Jenkins should execute. You can do this by adding steps to the job pipeline.
Once you have configured the job pipeline, you can start the job by clicking on the "Build Now" button. Jenkins will then execute the steps in the job pipeline in order.
How to use Jenkins in CI/CD:
Jenkins can be used to create CI/CD pipelines that automate the build, test, and deploy process. This can free up developers to focus on writing code and fixing bugs.
To create a CI/CD pipeline with Jenkins, you would typically create a job for each stage of the pipeline, such as building the code, running the tests, and deploying the artifact to production. You can then configure Jenkins to run the jobs in order, creating a complete CI/CD pipeline.
How to use Jenkins in CI/CD and DevOps:
Jenkins can be used to integrate with other DevOps tools, such as Git, Docker, and Kubernetes. This allows you to create a complete CI/CD pipeline that spans the entire software development lifecycle
Jenkins can be used to create CI/CD pipelines that automate the build, test, and deploy process. This can free up developers to focus on writing code and fixing bugs.
To create a CI/CD pipeline with Jenkins, you would typically create a job for each stage of the pipeline, such as building the code, running the tests, and deploying the artifact to production. You can then configure Jenkins to run the jobs in order, creating a complete CI/CD pipeline.
Jenkins can also be used to integrate with other DevOps tools, such as Git, Docker, and Kubernetes. This allows you to create a complete CI/CD pipeline that spans the entire software development lifecycle.
For example, you could use Jenkins to trigger a build whenever a change is made to the codebase in Git. You could then use Jenkins to deploy the artifact to a staging environment for QA testing. Once the QA tests have passed, you could use Jenkins to deploy the artifact to production.
Here is an example of a simple CI/CD pipeline that uses Jenkins:
When a change is made to the codebase, Jenkins triggers a job that builds the code.
The build job compiles the code and runs the tests.
If the tests pass, the build job deploys the artifact to a staging server.
QA engineers test the artifact on the staging server.
If the tests pass, the build job deploys the artifact to production.
This is just a simple example, of course. You can create more complex CI/CD pipelines with Jenkins to meet the specific needs of your project.
Conclusion:
Jenkins is a powerful tool that can be used to automate the software development process and to create CI/CD pipelines. Jenkins is also a great tool for DevOps.
If you are new to Jenkins, I recommend that you start by reading the official Jenkins documentation. There are also many tutorials and articles available online that can teach you how to use Jenkins.