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Linux Level 02 – Day 07: Install a Package

This document explains how to install the git package on multiple Linux servers using the yum package manager. The objective is to ensure that all application servers have Git installed to meet application deployment requirements.





Objective

Install the git package on the following servers:

  • stapp01
  • stapp02
  • stapp03

Package Manager: yum (used in CentOS/RHEL-based systems)



Understanding the Requirement

Git is a distributed version control system used for tracking changes in source code. Many DevOps workflows depend on Git for pulling repositories, managing branches, and handling CI/CD pipelines.

Since these servers host applications, Git must be available system-wide.

Installing a package requires elevated privileges because it modifies protected system directories such as /usr/bin, /etc, and /var/lib.



Step 1: Install on stapp01

Connect to the first server:

ssh tony@stapp01
# Password: Ir0nM@n

Install Git using sudo privileges:

sudo yum install git -y
# Password: Ir0nM@n (if prompted)

Verify installation:

git --version

Exit session:

exit



Step 2: Install on stapp02

Connect to the second server:

ssh steve@stapp02
# Password: Am3ric@

Install Git:

sudo yum install git -y

Verify:

git --version

Exit session:

exit



Step 3: Install on stapp03

Connect to the third server:

ssh banner@stapp03
# Password: BigGr33n

Install Git:

sudo yum install git -y

Verify:

git --version

Exit session:

exit



Deep Dive: How yum Works

yum (Yellowdog Updater Modified) is a package management utility used in Red Hat-based Linux distributions.

When you run:

sudo yum install git -y

The system performs these steps:

  1. Connects to configured repositories
  2. Checks dependency requirements
  3. Downloads required packages
  4. Verifies package signatures (GPG check)
  5. Installs files into system directories
  6. Updates the RPM database



Command Breakdown

  • sudo → Executes command with root privileges
  • yum → Package manager
  • install → Action to install package
  • git → Package name
  • -y → Automatically answer "yes" to prompts

The -y flag is important for automation scripts because it prevents interactive confirmation prompts.



Validation Across Servers

To confirm Git is installed successfully on each server:

git --version

Expected output format:

git version X.Y.Z



Key Outcome

The git package is installed and available on all three application servers (stapp01, stapp02, and stapp03). Each server is now prepared to handle version-controlled application workflows.