PixelPerfectUI

Contents of DevOps

Essential DevOps tips, tricks, and best practices to improve your coding skills and write more efficient code.

DevOps Tools Setup Guide

✅ 1. Tools Prerequisite Information

Q1. What are the common prerequisites required before installing DevOps tools on any OS?
A: Common prerequisites include:

  • Package manager installed (e.g., apt, yum, brew, choco)
  • Internet connectivity
  • Admin/sudo privileges
  • Essential utilities like curl, wget, git, unzip, tar
  • Open ports and firewall rules if networking is involved

Q2. Why is it important to update the package manager before installing software?
A: Updating the package manager ensures you're pulling the latest metadata and dependencies. This avoids installation errors and ensures compatibility.

Q3. How do you verify if a tool is installed correctly?
A: By using version commands like toolname --version or checking paths with which toolname or where toolname (Windows).

💻 2. Chocolatey for Windows

Q1. What is Chocolatey?
A: Chocolatey is a Windows package manager that allows you to install software using the command line, similar to apt on Ubuntu or yum on CentOS.

Q2. How do you install Chocolatey?
A: Open PowerShell as Administrator and run:

Set-ExecutionPolicy Bypass -Scope Process -Force; `
[System.Net.ServicePointManager]::SecurityProtocol = `
[System.Net.ServicePointManager]::SecurityProtocol -bor 3072; `
iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))

Q3. How do you install software with Chocolatey?
A: Example:

choco install git -y

Q4. How does Chocolatey compare to other package managers?
A: Chocolatey brings Linux-style package management to Windows. It's scriptable, supports automation, and integrates with CI/CD tools.

🍺 3. Homebrew for macOS

Q1. What is Homebrew?
A: Homebrew is a package manager for macOS that allows easy installation of software via the terminal.

Q2. How do you install Homebrew?
A: Run this in the terminal:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Q3. How do you manage packages with Homebrew?
A:

  • Install: brew install git
  • Remove: brew uninstall git
  • Search: brew search node

🧰 4. Installing Softwares

Q1. What are the challenges in installing software across OSes?
A: Challenges include dependency issues, incompatible packages, permissions, and different command syntax.

Q2. How do you handle dependency issues?
A: Use the package manager to automatically install dependencies or manually resolve them if needed.

Q3. Difference between using a package manager and compiling from source?
A:

  • Package Manager: Fast, easy, managed by OS.
  • Source Compilation: Customizable, used when packages are unavailable or need config changes.

🐧 5. Tools Prerequisites for CentOS 9 / RHEL 9 / Rocky Linux

Q1. What’s the default package manager?
A: dnf (Dandified YUM)

Q2. How do you enable EPEL on RHEL systems?
A:

sudo dnf install epel-release -y

Q3. How to install common tools?

sudo dnf install git curl wget unzip -y

🐧 6. Tools Prerequisites for Ubuntu 24

Q1. How is Ubuntu package management different?
A: Ubuntu uses apt as its package manager, which fetches packages from .deb repositories.

Q2. What’s the difference between apt update and apt upgrade?
A:

  • apt update: Updates package metadata.
  • apt upgrade: Installs latest versions of installed packages.

Q3. Install basic tools on Ubuntu 24?

sudo apt update && sudo apt install git curl wget unzip -y

🌐 7. Signups

Q1. What platforms should you sign up for in DevOps?
A: GitHub, Docker Hub, AWS, Terraform Cloud, Jenkins, and any CI/CD or container registry platforms.

Q2. Why sign up early?
A: To access APIs, create repositories, upload Docker images, and explore cloud infrastructure hands-on.

Q3. How to securely manage tokens or credentials?
A: Use password managers, .env files, secret managers like AWS Secrets Manager or HashiCorp Vault.

☁️ 8. AWS Setup

Q1. First step when setting up AWS?
A: Create an AWS account, set up billing, and create a root user with MFA enabled. Then create IAM users for daily use.

Q2. How to manage AWS credentials?
A:

  • Use aws configure to store credentials locally.
  • Store securely in .aws/credentials file.
  • Rotate and delete unused credentials.

Q3. Essential AWS services for DevOps beginner?
A:

  • EC2: Virtual servers
  • S3: Storage
  • IAM: Permissions
  • CloudWatch: Monitoring
  • CodePipeline: CI/CD

Q4. What are IAM roles and policies?
A: IAM roles are used to grant temporary access to services. Policies define what actions are allowed or denied.

🎬 9. Outro / Wrap-up

Q1. Next steps after tool setup?
A: Start learning containerization (Docker), orchestration (Kubernetes), CI/CD pipelines, IaC (Terraform), and monitoring/logging.

Q2. How to make your setup repeatable?
A: Use shell scripts, Dockerfiles, Ansible playbooks, or Terraform to automate the setup.

Q3. Example of a shell script to install common tools?

#!/bin/bash
sudo apt update
sudo apt install git curl wget unzip -y