Jenkinsfile is a file where you define the pipeline of your workflow, written in Groovy. It succeeds with the following stages on the UI: Pipeline on Jenkinsfile Scroll down to the Pipeline section and rename the branch from */master to */start_here under Branch Specifier. Configure that default setting in the Configure page of this job and select our repo’s branch.Ĭlick on the Configure button of this simple_jenkins job. It rather has main and start_here branches. That’s because our repo does not have a master branch. This means that Jenkins couldn’t fetch this master branch from the remote. If you hit save, the Jenkins job starts to run but with an error of stderr: fatal: couldn't find remote ref refs/heads/master. As mentioned above, fork the repository and run it based on your desired parameters later in this article. This pipeline should fetch the source code in this repo. Type your repo in the repository field like the following image: Use Git in the SCM, which expands the repository details. Scroll down to the Pipeline section and choose “Pipeline script from SCM” under the Definition. You do that by setting up an SVC (source version control e.g., Github) in your pipeline. So the next thing to do is to let Jenkins know where your code lives. Usually, Jenkins checks out the source code of your application and then builds it on its workspace. Select “pipeline” for your project style and name your Jenkins job: Now you’re at the Jenkins dashboard page. The exact stages of your pipeline depend on your application needs. A typical job would start with building your app, then unit testing, and finally deploying to production. It’s the job that you need to build a pipeline. Create a new Jenkins build jobĪ build job in Jenkins is what you need to execute tasks in your workflow. Let’s break this down in the following sections, where we’ll go through an example of how to use Jenkins to run a full pipeline. Each stage has a set of steps to do specific tasks. What is a pipeline? A pipeline is a sequence of stages in your software. You’ll then get redirected to the Jenkins interface: Jenkins pipeline example Leave it as the localhost or if you want to customize it with your own domain, change it to it.Ĭlick on start using Jenkins. Next is the instance configuration of your Jenkins URL. The next screen sets up the admin login fill in your desired information: In my case, I installed recommended plugins. Open up the localhost:8080 on your browser and paste the password in the required field:Īfter you click continue, choose whether you want to install plugins or leave Jenkins as the bare minimum setup. Copy this password because you’ll need it when you log into the Jenkins UI. Run it with the following command: docker run -p 8080:8080 -p 50000:50000 -restart=on-failure jenkins/jenkins:lts-alpine-jdk17Īfter you run the image, you’ll find a password generated by Jenkins. To pull the docker image, run the following: docker pull jenkins/jenkins:lts-alpine-jdk17 Now, open your terminal and start writing some commands. I’ll use an Alpine version of the Jenkins docker image, which you’ll find on jenkins/jenkins docker image with the tag lts-alpine-jdk17. If you want to include Jenkins on a Docker container, or you want to avoid the hassle of running it on your machine, enjoy the ride here to install Jenkins using a lightweight docker image. If you don’t have Jenkins on your machine and want to install it and play around with it, check Jenkins documentation to install it on your desired OS. This way, you’ll be able to follow along with this tutorial without worrying about your setup. If you don’t already have Jenkins installed on your machine, I will explain how to run Jenkins on Docker in the next section. I assume you have a basic knowledge of what CI/CD is and what Jenkins is. To add your email information on the main branch (for use later on), fork the repository and run it based on your desired use cases. This tutorial’s code lives in this repository. You will also learn about stages, steps, post actions, environment variables, credentials, email notifications, and deployment. I’ll give an in-depth view of a Jenkins pipeline example using Jenkinsfile. In this tutorial, I’ll create a full pipeline to practice CI/CD using Jenkins, including how to set up Jenkins on Docker. Both large, established organizations and small, growing companies use CI/CD to deliver software faster and to detect bugs in the software lifecycle. One of the game changers in modern software development is Continuous Integration and Continuous Development (CI/CD).
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