Agnes
Day 7 -Package Manager in Linux

Day 7 -Package Manager in Linux

Agnes jadhav's photo
Agnes jadhav
·

3 min read

In this Blog, we will cover the package Manager and Sytemctl.

Package Management

The package manager can be a graphical application like a software center or a command line tool like apt-get or Pacman. A package manager is a tool that allows users to install, remove, upgrade, configure, and manage software packages on an operating system.

What is a package?

In Linux, a package is a format that contains all the necessary files and information that are required to install and manage a specific application.

Different kinds of package managers:

Package Managers differ based on the packaging system but the same packaging system may have more than one package manager.

APT (Advanced Package Tool) - APT is a command-line tool, which works with Ubuntu’s Advanced Packaging Tool (APT).

Some examples use for the apt utility include:

  • sudo apt-get install package_name - Install the Package

  • sudo apt-get update followed by sudo apt-get upgrade - Update the Package

    YUM (YellowDog update Manager) - YUM provides a command-line interface for managing packages in RHEL.

  • sudo yum install package_name - Install the package

  • sudo yum update & sudo apt-get upgrade - Update the Package

  • sudo yum remove package_name - Remove the Package

RPM (Red Hat Package Manager) - It is an open-source package manager (default) and the most famous utility of package management for Red Hat-based systems such as Fedora, CentOS, and RHEL.

  • sudo apt install rpm - Install the Package

Below is some example of installing Docker & Jenkins using Package Manager.

Installing Docker on Ubuntu using APT

  1. Open the terminal on Ubuntu

  2. Check if the system is up-to-date

  • sudo apt update

  • 3. Install Docker using the following command

  • sudo apt-get install docker.io -y

    check the version installed using the following command: docker --version

Install Jenkins with Ubuntu

Step 1: Install Java

Jenkins requires the Java Runtime Environment (JRE).

  1. java --version To check the latest Java version if java is already installed on system.

2. Install OpenJDK 8, : sudo apt install openjdk-8-jdk -y

install OpenJDK 11, run: sudo apt install openjdk-11-jdk -y

Step 2 : Add Jenkins

1. Import GPG Key by using the below command

The GPG key verifies package integrity but there is no output.

curl -fsSL https://pkg.jenkins.io/debian/jenkins.io-2023.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null

2. Update and install the Jenkins

sudo apt update

sudo apt install jenkins -y

Step 3 : Stop the service jenkins and post before and after screenshots.

Before:

After:

Task 3:

systemctl and service are both commands used to manage services in Linux, but they have some differences in their functionality and usage.

systemctl : The systemctl command interacts with the SystemD service manager to manage the services.

services: It manages the services by interacting with the SystemD process.

It provides controlling services like Start,Stop,restart, enable, disable.

systemctl start jenkins - Is a command to start the Jenkins services.

Service jenkins status - Is a command to check the status of Jenkins Services.

Thankyou for reading this Blog.

Happy Learning!

Linux#90daysofdevopsTrainWithShubhamDevopsHashnode