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Linux Tips

A blog by Blogger in CodeName Blogs

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Entries in this blog

Chapter 4: Terraform State and Providers

by: Akhilesh Mishra Fri, 28 Nov 2025 15:39:09 +0530 How does Terraform remember what it created? How does it connect to AWS or Azure? Two concepts answer these questions: State (Terraform’s memory) and Providers (Terraform’s translators). Without state and providers, Terraform would be useless. Let’s understand them. What is Terraform State? State is Terraform’s memory. After terraform apply, it stores what it created in terraform.tfstate. Run this example: resource "local_file" "example" { co

Chapter 3: Terraform Variables and Locals

by: Akhilesh Mishra Fri, 28 Nov 2025 15:35:51 +0530 Basic Variable Types Terraform has three basic types: string, number, and bool. variable "name" { type = string description = "User name" default = "World" } variable "counts" { type = number default = 5 } variable "enabled" { type = bool default = true } Use them: resource "local_file" "example" { content = "Hello, ${var.name}! Count: ${var.counts}, Enabled: ${var.enabled}" filename = "output.txt" } 🚧You cannot use reserved words like count

Chapter 2: Getting Started - Your First Steps

by: Akhilesh Mishra Fri, 28 Nov 2025 15:34:33 +0530 Step 1: Install Terraform For macOS users: brew install terraform For Windows users: Download from the official Terraform website and add it to your PATH. For Linux users: wget https://releases.hashicorp.com/terraform/1.12.0/terraform_1.12.0_linux_amd64.zip unzip terraform_1.12.0_linux_amd64.zip sudo mv terraform /usr/local/bin/ Step 2: Verify Installation terraform version You should see something like: Terraform v1.12.0 Step 3: Create Your

Chapter 1: Infrastructure as Code - Here We Go

by: Akhilesh Mishra Fri, 28 Nov 2025 15:33:10 +0530 If you go back two decades, everyone used those physical servers (produced by IBM, HP, and Cisco), which took weeks to setup correctly before we could run the applications on them. Then came the time of virtualization. Sharing computing resources across multiple OS installations using hypervisor-based virtualization technologies such as VMware became the new normal. It reduced the time to spin up a server to run your application but also incr

Learn Infrastructure as Code with Terraform

by: Akhilesh Mishra Fri, 28 Nov 2025 15:31:09 +0530 Stop clicking around cloud dashboards. Start building reproducible, version-controlled, scalable infrastructure using Terraform, the industry standard for Infrastructure as Code. This course takes you from first terraform init to real-world Terraform architectures with modules, best practices, and production workflows. 👉 Designed for Linux users, DevOps engineers, cloud learners, and sysadmins transitioning to modern IaC. Most Terraform tutor

LHB Linux Digest #25.35: Trap, Network Troubleshooting Tips, Self-host Server Management and More

by: Abhishek Prakash Fri, 14 Nov 2025 17:08:50 +0530 Feels like 2025 is ending sooner than expected. I know that's not the case but it just feels like that 😄 On that note, we plan to publish at least two more courses for you before the year ends. They are likely to be on Terraform and Kubernetes. I am also planning a microcourse on 'automated backups with cron and rsync'. These classic Linux tools are always reliable. And in the meantime, we are also working on expanding our collection of hand

Find Subdomains Fast with OWASP Amass: Don't Miss Hidden Entry Points

by: Hangga Aji Sayekti Fri, 14 Nov 2025 07:49:11 +0530 Did you know that many security breaches happen through assets companies didn't even know they had? Subdomains like staging.company.com or test.api.company.com are frequently overlooked yet can expose your entire infrastructure. OWASP Amass solves this by automatically discovering all your subdomains, giving you a complete picture of your attack surface. In this guide, we'll show you how to use it like a pro. What is OWASP Amass? OWASP Ama

Why I Stopped Hating Systemd

by: Umair Khurshid Thu, 13 Nov 2025 18:02:00 +0530 Every few years, the Linux world finds something to fight about. Sometimes it is about package managers, sometimes about text editors, but nothing in recent memory split the community quite like systemd. What began as an init replacement quietly grew into a full-blown identity crisis for Linux itself, complete with technical manifestos, emotional arguments, and more mailing list drama than I ever thought possible. I did not plan to take a side

Common Networking Issues Every DevOps Engineer Encounters

by: Umair Khurshid Tue, 11 Nov 2025 20:03:47 +0530 Networking problems rarely announce themselves clearly. A deployment fails, a pod cannot reach its database, or a service responds intermittently. The logs look clean, yet something feels wrong. Most engineers eventually learn one painful truth: when everything else seems fine, it is usually the network. From misrouted traffic to invisible firewalls, let me walk you through the most frequent networking issues that DevOps engineers encounter in

Pentora Box: Pen-Test Practice Labs

by: Abhishek Prakash Sat, 08 Nov 2025 17:52:50 +0530 Learn by doing, not just reading or watching. Pen-testing can’t be mastered by watching videos or reading blogs alone. You need to get your hands dirty. Pentora Box turns each Linux Handbook tutorial into a self-try exercise. Every lab gives you a realistic, safe environment where you can explore reconnaissance, scanning, exploitation, and post-exploitation, step by step. How to use it? Curious how you can get started with ethical hacking an

LHB Linux Digest #25.34: CNCF Project Hands-on, Better split Command, Local AWS Cloud Stack and More

by: Abhishek Prakash Fri, 07 Nov 2025 18:12:51 +0530 After publishing the Linux Networking at Scale, while we work on the new course, I am proud to present a super long but immensely helpful hands-on guide that shows you the steps from creating an open source project to submitting it to CNCF. The guide is accesible to members of all levels. Building and Publishing an Open Source Project to CNCFA hands-on guide to creating, documenting, and submitting an open source project to the CNCF Landscap

A to Z Hands-on Guide to Building and Publishing an Open Source Project to CNCF

by: Sachin H R Fri, 07 Nov 2025 17:49:50 +0530 The idea for a practical guide to build an open source project and publishing it to CNCF came to me when I was working on KubeReport, an open source tool that automatically generates PDF/CSV deployment reports from your Kubernetes cluster. It is designed for DevOps teams, QA, and managers. It can auto-email reports, integrate with Jira, and track exactly what got deployed and when. I noticed that there were not clear enough documentation on how to

Pen-Testing Lab: Hunting and Exploiting SQL Injection With SQLMap

by: Hangga Aji Sayekti Tue, 04 Nov 2025 12:36:44 +0530 SQL injection might sound technical, but finding it can be surprisingly straightforward with the right tools. If you've ever wondered how security researchers actually test for this common vulnerability, you're in the right place. Today, we're diving into sqlmap - the tool that makes SQL injection testing accessible to everyone. We'll be testing a deliberately vulnerable practice site, so you can follow along safely and see exactly how it

LHB Linux Digest #25.33: Linux Networking Course, Linux Practice Project, Distributed File System and More

by: Abhishek Prakash Fri, 31 Oct 2025 17:16:28 +0530 Good news! All modules of the new course 'Linux Networking at Scale' have been published. You can start learning all the advanced topics and complete the labs in the course. Linux Networking at ScaleMaster advanced networking on Linux — from policy routing to encrypted overlays.Linux HandbookUmair KhurshidThis course is only available for Pro members. This would be a good time to consider upgrading your membership, if you are not already a P

Creating an Automated PDF Conversion System on Linux with unoconv [In-depth Guide]

by: Roland Taylor Thu, 30 Oct 2025 19:21:42 +0530 Creating PDFs is one of the easiest tasks to take for granted on Linux, thanks to the robust PDF support provided by CUPS and Ghostscript. However, converting multiple files to this portable format can get tedious fast, especially for students, non-profits, and businesses that may have several files to handle on any given day. Fortunately, the Linux ecosystem gives you everything you need to fully automate this task, supporting several file for

Automating XSS Hunting with Dalfox [Pen Testing Hands-on]

by: Hangga Aji Sayekti Tue, 28 Oct 2025 18:46:16 +0530 Want a fast XSS check? Dalfox does the heavy lifting. It auto-injects, verifies (headless/DOM checks included), and spits out machine-friendly results you can act on. Below: installing on Kali, core commands, handy switches, and a demo scan against a safe target. Copy, paste, profit. (lab-only.) Behind the Scenes: How Dalfox Works Dalfox is more than a simple payload injector. Its efficiency comes from a smart engine that: Performs Paramet

LHB Linux Digest #25.32: New Linux Networking Course, iotop, Chargebee Alternative and More

by: Abhishek Prakash Fri, 24 Oct 2025 18:11:02 +0530 I am happy to announce the release of our 14th course, Linux Networking at Scale. Okay, this is still a work in progress but I could not wait to reveal it to you 😀 It's a 4-module micro-course that takes you into the world of policy routing, VRFs, nftables, VXLAN, WireGuard, and real-world traffic control, with practical labs in each module. From sysadmins to DevOps to homelab enthusiasts, there is something for everyone in this course. Two

Linux Networking at Scale

by: Umair Khurshid Fri, 24 Oct 2025 16:57:28 +0530 🚀 Why this course? Modern infrastructure demands more than basic networking commands. When systems span across containers, data centers, and cloud edges, you need to scale, isolate, and secure your network intelligently; all using the native power of Linux. This micro-course takes you beyond the basics and into the world of policy routing, VRFs, nftables, VXLAN, WireGuard, and real-world traffic control, with practical labs at every step. 🧑‍🎓

Monitoring I/O Usage and Network Traffic in Linux With iotop & ntopng

by: LHB Community Fri, 24 Oct 2025 11:21:17 +0530 You've already seen how to monitor CPU and memory usage with top and htop. Now, let's take a look at two other tools you can use for monitoring your system: iotop and ntopng. These tools monitor disk I/O (Input/Output) and network traffic, respectively. This tutorial will show you how to install, configure, and use both tools. What are iotop and ntopng? iotop: Similar in appearance to top and htop, iotop is a real-time disk I/O monitoring utili

PenTesting 101: Using TheHarvester for OSINT and Reconnaissance

by: Hangga Aji Sayekti Wed, 22 Oct 2025 11:49:45 +0530 Ever wonder how security pros find those hidden entry points before the real testing even begins? It all starts with what we call reconnaissance—the art of gathering intelligence. Think of it like casing a building before a security audit; you need to know the doors, windows, and air vents first. In this digital age, one of the go-to tools for this initial legwork is TheHarvester. At its heart, TheHarvester is a Python script that doesn't

LHB Linux Digest #25.31: syslog guide, snippet manager, screen command more

by: Abhishek Prakash Fri, 17 Oct 2025 18:31:53 +0530 Welcome back to another round of Linux magic and command-line sorcery. Weirdly scary opening line, right? That's because I am already in Halloween spirit 🎃 And I'll take this opportunity to crack a dad joke: Q: Why do Linux sysadmins confuse Halloween with Christmas? A: Because 31 Oct equals 25 Dec. Hint: Think octal. Think Decimal. Jokes aside, we are working towards a few new series and courses. The CNCF series should be published next wee

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