You need to set up a volume to start the Jenkins instance data.Ĭreate a directory named jenkins_compose and create a file named docker-compose.yaml with these contents. But if you restart it, you will lose all your data. You can set it up, log in, and start running jobs. That will give you a running Jenkins controller. $ docker run -it -p 8080:8080 jenkins/jenkins:lts You can run a Jenkins controller with a single Docker command: In a production environment, you would add a Jenkins user with a user ID of 1000 to the systems running Jenkins controllers and agents. To keep the tutorial simple and easy to follow, it will run the containers as root. You’ll also need access to Docker Hub to download the latest Jenkins images. If you want to try out the sample configurations, you’ll need a system with Docker and Docker Compose installed. So, we’ll use Docker Compose to do just that.
While it’s possible to run jobs on the controller, it’s considered a best practice to always create at least one agent and run your jobs there. A Jenkins controller sends jobs to the appropriate agent based on the job requirements and the resources available at the time. One of Jenkins’s most powerful features is its ability to distribute jobs across multiple nodes. For many, Jenkins is synonymous with continuous integration and continuous delivery (CI/CD). While you can use it to automate just about any task, it’s most often associated with building source code and deploying the results. But they come in a simpler system that’s more suited to smaller applications that don’t need Kubernetes’ resiliency and scaling.
Since Docker Compose lets you configure related containers in a single YAML file, you get the same Infrastructure-as-Code abilities as Kubernetes. It’s a tool for defining how to run multiple containers in a single configuration file and start, stop, and restart them with a single command.
You also don’t want to manage a bunch of shell scripts, especially when the containers need to talk to each other.
Sometimes you need to run more than one container, but you don’t want or need the complexity of Kubernetes. In this tutorial, you’ll see how easy it is to install and run Jenkins with Docker Compose. But how do you manage a Jenkins controller and agents together in Docker? Containers are a powerful tool for building software in different environments, and Jenkins itself is easy to run in a container.
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