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    Mastering Shell for DevOps: Automate, streamline, and secure DevOps workflows with modern shell scripting
    Mastering Shell for DevOps: Automate, streamline, and secure DevOps workflows with modern shell scripting
    Mastering Shell for DevOps: Automate, streamline, and secure DevOps workflows with modern shell scripting
    Ebook226 pages1 hour

    Mastering Shell for DevOps: Automate, streamline, and secure DevOps workflows with modern shell scripting

    By Gilbert Stew

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    About this ebook

    "Mastering Shell for DevOps" is all about giving DevOps, cloud, and Linux folks the know-how to automate and make their workflows more efficient with shell scripting. The book uses real-world examples

    LanguageEnglish
    PublisherGitforGits
    Release dateNov 3, 2024
    ISBN9788197950476
    Mastering Shell for DevOps: Automate, streamline, and secure DevOps workflows with modern shell scripting

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      Book preview

      Mastering Shell for DevOps - Gilbert Stew

      Mastering Shell for DevOps

      Automate, streamline, and secure DevOps workflows with modern shell scripting

      Gilbert Stew

      Prologue

      When I first started working in the DevOps field, it was pretty overwhelming. There were a lot of repetitive tasks and manual configurations to deal with. Every deployment felt like starting from scratch, and the slightest mistake could cause major problems with the system. Without automation, my team and I spent a lot of time on tasks that should have been simple. We were more often than not just putting out fires and not innovating, and it was pretty frustrating.

      One day, after a particularly rough week of manual deployments and unexpected system failures, I realized there had to be a better way. I started looking into shell scripting. It was like opening a whole new world in DevOps. All of a sudden, we could automate repetitive tasks, cut down on errors, and save a lot of time. The command line became my canvas, where I could script out solutions to problems that once seemed impossible.

      As I started using shell scripting in our workflows, I could see a real change. Deployments were more reliable, configuration drift was reduced, and our systems were more resilient. My team went from being reactive to proactive, focusing on optimization rather than just maintenance. The beauty of shell scripts is that they make it simple and elegant to link up different tools and platforms.

      This book is where I've reached the end of my journey from struggling with manual DevOps to feeling empowered by mastering shell scripting. I wrote it to share the practical knowledge and insights I've gained, in the hope that it'll help others to navigate the complexities of DevOps with greater ease. If we use shell to its fullest, we can automate, innovate, and take our practices to the next level.

      Copyright © 2024 by GitforGits

      All rights reserved. This book is protected under copyright laws and no part of it may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without the prior written permission of the publisher. Any unauthorized reproduction, distribution, or transmission of this work may result in civil and criminal penalties and will be dealt with in the respective jurisdiction at anywhere in India, in accordance with the applicable copyright laws.

      Published by: GitforGits

      Publisher: Sonal Dhandre

      www.gitforgits.com

      [email protected]

      Printed in India

      First Printing: November 2024

      Cover Design by: Kitten Publishing

      For permission to use material from this book, please contact GitforGits at [email protected].

      Content

      Preface

      GitforGits

      Acknowledgement

      Chapter 1: Automating Routine DevOps Tasks

      Overview

      Up and Running with Shell Automation

      Getting Started with Bash Scripting

      Add Flexibility Parameters

      Run Scripts on Schedule

      Bash Variables for Enhanced Customization

      Creating Reusable Scripts

      Build Modular Script with Functions

      Run Multiple Tasks in One Execution

      Add Optional Logging

      Error Handling and Logging

      Scenario 1: Handle Command Not Found Errors

      Scenario 2: Handle Permission Denied Errors

      Scenario 3: Handle Missing/Non-Existent files

      Scenario 4: Handle Unexpected Input

      Knowledge Exercise

      Chapter 2: Managing CI/CD Pipelines with Shell Scripting

      Overview

      Automating CI/CD Pipeline Steps

      Setting up Project Structure

      Create the Build Script

      Create Test Script

      Create Deployment Script

      Create CI/CD Pipeline Script

      Execute CI/CD Pipeline

      Integrating with Jenkins and GitLab CI

      Integrate with Jenkins

      Integrate with GitLab CI

      Interact with CI/CD Tool APIs

      Monitor Pipeline Status

      Scripted Code Rollbacks and Redeployments

      Implement Version Control with Git Tags

      Enhance Deployment Script

      Create Rollback Script

      Integrate Rollback Logic into Pipeline

      Handle Configuration and Database Changes

      Add Notifications, Logging and Fixing Issues

      Summary

      Chapter 3: Test Automation and Validation Scripts

      Overview

      Writing Automated Unit and Integration Test Scripts

      Setting up Testing Framework

      Create Test Script

      Define Test Scripts

      Incorporate Environment Variables

      Generate Test Reports

      Handle Test Databases

      Parallelize Tests

      Integrate Tests into CI/CD Pipeline

      Automating Code Quality Checks

      Setting up Linting Tools

      Create Linting Script

      Configure ESLint Rules

      Integrate Static Analysis Tools

      Update Test Script with Code Quality Checks

      Generate Code Quality Reports

      Integrate Code Quality Checks into the CI/CD Pipeline

      Automate Code Formatting

      Enforce Commit Standards with Husky

      Dynamic Validation with Shell Scripts

      Validate Application Health

      Validate API Endpoints

      Validate Response Content

      Validate Infrastructure Components

      Aggregate Validation Checks

      Integrate Validation into Deployment Workflow

      Schedule Regular Validation

      Send Alerts on Failure

      Summary

      Chapter 4: Task Scheduling and Monitoring with CRONTAB

      Overview

      Setting up Scheduled Tasks

      Understand CRONTAB Syntax

      Setting up Backups with CRONTAB

      Automate Health Checks

      Schedule Log Rotations

      Using Environment Variables in CRON Jobs

      Schedule Jobs with Special Timing Needs

      Using System-Wide CRON Directories

      Monitoring Scheduled Tasks

      Create a Monitor Script

      Schedule Monitor Script

      Implement Alert Notifications

      Create a Dashboard for CRON Jobs

      Implement Retry Mechanisms

      Dynamic Scheduling and CRON Alternatives

      Using ‘at’ Command

      Leveraging ‘anacron’ for Infrequent Tasks

      Advanced Schedule with ‘systemd’ Timers

      Utilize ‘batch’ Command

      Event-Driven Schedule with ‘inotify’

      Implement Flexible Schedule with ‘fcron’

      Summary

      Chapter 5: Orchestrating Infrastructure with Shell Scripting

      Overview

      Automating Infrastructure Setup and Tear-Down

      Provision Servers

      Configure Server Automatically

      Automate Infrastructure Teardown

      Automate Entire Workflow

      Scripting Configuration Management Tasks

      Automate Configuration File Management

      Automate Environment Setup

      Automate Software Deployment

      Automate User and Permission Management

      Automate Firewall Configuration

      Automate Environment Consistency across Multiple Servers

      Automate with Infrastructure as Code Tools

      Version Control and Documentation of Infrastructure Scripts

      Using Git

      Document Infrastructure Scripts

      Leverage Git Hooks for Quality Control

      Summary

      Chapter 6: Incident Resolution and Log Management

      Overview

      Automating Incident Detection and Alerts

      Why Automation in Incident Detection?

      Monitor System Metrics

      Detect Service Status

      Automate Alert Triggers

      Implement Threshold-Based Alerts

      Integrate with Monitor Tools

      Quick Incident Resolution Scripts

      Automate Service Restarts

      Automate Resource Allocation

      Automate Log Clearance

      Automate Database Maintenance

      Integrate Incident Resolution Scripts with Detection

      Automate User Session Management

      Automating Log Collection and Analysis

      Collect Logs from Multiple Sources

      Parse Logs for Meaningful Data

      Automate Log Management Process

      Summary

      Chapter 7: Managing Network Traffic and Load Balancing

      Overview

      Traffic Monitoring with Shell Scripts

      Implement Network Traffic Monitoring

      Visualize and Log Inbound and Outbound Traffic

      Automate Continuous Monitoring

      Automating Load Balancer Configuration

      Understand the Need for Automation

      Setting up HAProxy

      Configure HAProxy Manually

      Automate Backend Server Updates

      Automate Scale Based on Traffic Load

      Implement Auto Scale Policies

      Automate Load Balancer Configuration in Cloud

      Integrate with Configuration Management Tools

      Failover and Traffic Redirection Scripts

      Implement Failover with HAProxy

      Implement DNS-Based Failover

      IP Routing Failover with ‘Keepalived’

      Automate Failover Actions

      Summary

      Chapter 8: Containerization and Shell Scripting

      Overview

      Container Deployment with Docker and Podman

      Install Docker

      Install Podman

      Automate Container Deployment with Docker

      Automate Container Deployment with Podman

      Configure Environment Variables

      Automate Container Deployment across Environments

      Managing Containers and Orchestration

      Scale Containers

      Access Container Logs

      Implement Health Checks

      Manage Container Networking

      Implement Load Balancing

      Monitor Containers

      Automating Kubernetes Deployment and Management

      Install kubectl

      Setting up a Kubernetes Cluster

      Deploy Applications with ‘kubectl’

      Automate Updates

      Automate Rollbacks

      Automate Health Checks

      Automate Resource Management

      Automate CI/CD Integration

      Summary

      Chapter 9: DevOps Security Automation with Shell Scripting

      Overview

      Scripting User Access and Permissions Management

      Automate User Account Setup

      Automate Permission Assignment

      Automate Access Control

      Automate User Deactivation and Removal

      Automate SSH Key Management

      Automate Password Policy Enforcement

      Automate Audit of User Accounts

      Automating Vulnerability Scanning and Patching

      Automate Security Scans

      Automate Vulnerability Checks

      Automate Patch Deployment

      Automate Notifications

      Automate System Reboots After Patching

      Automate Vulnerability Scanning for Containers

      Automate Log Monitor for Security Events

      Automate Firewall Configuration

      Automate Security Policy Enforcement

      System Audits and Compliance Checks

      Overview

      Using OpenSCAP for Compliance Checks

      Automate Configuration Verification

      Collect System Configuration Data

      Compare Configurations Against Baselines

      Schedule Regular Audits

      Secure Audit Data

      Summary

      Index

      Epilogue

      Preface

      Mastering Shell for DevOps is all about giving DevOps, cloud, and Linux folks the know-how to automate and make their workflows more efficient with shell scripting. The book uses real-world examples and simple instructions to show how to automate tasks and move away from manual work in a DevOps environment.

      We start with the basics of shell scripting, so you can learn to write scripts that get the job done. It then moves on to version control with Git and GitHub, showing the importance of collaboration and code management in this context. The book then jumps into infrastructure provisioning and configuration management, showing you how to automate the setup of servers and services using tools like AWS CLI, Docker, and Kubernetes.

      As your skills grow, you'll learn to set up monitoring and logging tools, automate incident detection and resolution, and manage network traffic and load balancing. The book also helps you learn how to automate security tasks, including user access management, vulnerability scanning, patching, and compliance checks. By the end of the book, you'll have a whole toolkit of shell scripts that will help you work more efficiently, reliably, and securely in your DevOps practices.

      In this book you will:

      Get your infrastructure provisioning done automatically with shell scripts for reliable, fast deployments.

      Make version control a lot easier by using Git and shell scripting for collaborative development.

      Set up a system to monitor

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