In this section, we will cover the steps required to install Jenkins on various platforms. Jenkins can be installed on different operating systems, including Windows, macOS, and Linux. We will provide detailed instructions for each platform to ensure a smooth installation process.

Before installing Jenkins, ensure you have the following prerequisites:

• Java Development Kit (JDK): Jenkins requires Java to run. Ensure you have JDK 8 or later installed on your system.
• Administrator Access: You need administrative privileges to install Jenkins.

1. Visit the Jenkins download page.
2. Under the "Windows" section, click on the "Windows" link to download the Jenkins Windows installer.

1. Locate the downloaded .msi file and double-click it to run the installer.
2. Follow the installation wizard steps:
   • Accept the license agreement.
   • Choose the installation directory (default is usually fine).
   • Select the components to install (default is recommended).

1. After installation, Jenkins will start automatically. If it doesn't, you can start it manually from the Start menu.
2. Open a web browser and navigate to http://localhost:8080.
3. You will be prompted to unlock Jenkins. Locate the initialAdminPassword file in the Jenkins installation directory (e.g., C:\Program Files (x86)\Jenkins\secrets\initialAdminPassword) and copy the password.
4. Paste the password into the web interface to unlock Jenkins.

1. Follow the setup wizard to complete the installation:
   • Install suggested plugins.
   • Create the first admin user.
   • Configure the instance URL.

If you don't have Homebrew installed, you can install it by running the following command in your terminal:

1. Open a terminal window.
2. Run the following command to install Jenkins:

1. Start Jenkins by running:

2. Open a web browser and navigate to http://localhost:8080.
3. Follow the same steps as in the Windows installation to unlock Jenkins and complete the setup.

1. Open a terminal window.
2. Add the Jenkins repository key to your system:

3. Add the Jenkins repository to your sources list:

1. Update your package list:

2. Install Jenkins:

1. Start the Jenkins service:

2. Enable Jenkins to start on boot:

3. Open a web browser and navigate to http://localhost:8080.
4. Follow the same steps as in the Windows installation to unlock Jenkins and complete the setup.

In this section, we covered the installation of Jenkins on Windows, macOS, and Linux. We walked through the steps to download, install, and start Jenkins on each platform. Additionally, we discussed how to unlock Jenkins and complete the initial setup. With Jenkins installed, you are now ready to explore its features and start creating your first Jenkins job in the next section.