How to install and configure Jenkins in Ubuntu?

To install and configure Jenkins on Ubuntu, you can follow these steps:

1. To install Java: First, make sure that Java is already installed on the system. You can use the following command to check the Java version:

java -version

If Java is not installed yet, please use the following command to install OpenJDK:

sudo apt update
sudo apt install default-jdk

1. Install Jenkins: Add the official repository for Jenkins and install Jenkins. Execute the following command:

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins

1. Start Jenkins: Begin the Jenkins service and set it to automatically start.

sudo systemctl start jenkins
sudo systemctl enable jenkins

1. Set up Jenkins: Access the Jenkins web interface by entering http://localhost:8080 in your browser. When accessing for the first time, you will need to enter the initial password, which can be found in the /var/lib/jenkins/secrets/initialAdminPassword file. Follow the on-screen instructions to complete the initialization setup for Jenkins, including installing necessary plugins.
2. Set up Jenkins plugins: Log in to the Jenkins backend, select “Manage Jenkins” -> “Manage Plugins” -> “Available” tab, and install the required plugins, such as Git, Maven, etc.
3. Set up Jenkins nodes: If you need to run Jenkins tasks on other computers, you can configure Jenkins nodes. In the Jenkins backend, select “Manage Jenkins” -> “Manage Nodes” -> “New Node”, enter the node information and save.

By following the steps above, you can install and configure Jenkins in Ubuntu, and start using Jenkins for continuous integration and deployment.