Understanding package manager and systemctl 📦🔧

What is a package manager in Linux 🐧?

A package manager in Linux is a software tool used for installing, updating, configuring, and removing software packages on a Linux-based operating system. It automates the process of software management by handling dependencies, ensuring that all required libraries and components are installed along with the desired software package.

What is a package 📦?

A package is a collection of files and metadata that makes up a software application or a set of related software functionalities. Think of it as a neatly bundled box containing everything needed to install and run a particular piece of software.

Different kinds of package managers

There are different kinds of package managers

1. APT (Advanced Package Tool)

2. YUM (Yellowdog Updater Modified)

3. Homebrew

4. Chocolatey

Tasks

Install docker and jenkins in your system from your terminal using package managers

➡️Install Docker

sudo apt-get update
sudo apt-get install docker.io

check the status of docker services in linux services

systemctl status docker

➡️ Install Jenkins

Jenkins requires Java to run so lets instal java first to do that

 sudo apt update 
sudo apt install fontconfig openjdk-17-jre

To check for java version

java –version

To Jenkins installation

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

    sudo apt-get update
    sudo apt-get install Jenkins

To check the status of Jenkins

sudo systemctl status Jenkins

systemctl and systemd

Systemctl and systemd are integral components of modern Linux distributions, revolutionizing the way system management tasks are handled. They were developed primarily by Red Hat and adopted by numerous other distributions due to their robustness, efficiency, and centralized control over system services.