How to install and work with the Jenkins Docker image

• Using Docker pull: In our terminal or command prompt, we’ll run the following command to retrieve the Jenkins image from the Docker Hub registry:

  docker pull jenkins/jenkins:lts
  

• Using Docker image: If we want to do other installations using Jenkins, then we’ll use the following command:

  FROM jenkins/jenkins:lts-jdk11
  

After this, we can do other installations. This command downloads the latest version of Jenkins.

• Launch container: Once the image has been downloaded, we’ll use the following command to launch a container from it:

  docker run -p 8080:8080 -p 50000:50000 jenkins/jenkins:lts
  

• Accessing Jenkins: We can access the Jenkins web interface once the container runs by opening a web browser and going to http://localhost:8080. The Jenkins setup wizard will appear, guiding us through the initial configuration of our Jenkins server.
• Next, we’ll follow the setup wizard’s instructions to create an admin user and install any required plugins.
• We can automate our build, test, and deployment processes after configuring Jenkins.

Note: Because Jenkins stores its configuration and job data in the container’s file system, deleting the container will result in losing our data. To save our data, use the -v option in the Docker run command to mount a volume from our host machine to the container. Consider the following example:

docker run -p 8080:8080 -p 50000:50000 -v /path/on/host:/var/jenkins_home jenkins/jenkins:lts

This command mounts the directory /path/on/host on our host machine to the container’s /var/jenkins home directory, where Jenkins stores its data. This allows us to keep our data even if the container is deleted.