Tecmint: Linux Inside

Most Linux interview lists recycle the same 10 questions from a decade ago, and many of the “official” answers are outdated or no longer apply to modern Linux distributions. While the fundamentals haven’t changed, Linux itself has evolved. Tools like journalctl have replaced older logging methods on many distributions, ss has largely replaced netstat, and several traditional services and commands are no longer the default.

This tutorial shows you how to install TiDB using TiUP, start a local cluster, connect to it with the MySQL client, and run your first queries on Ubuntu and RHEL-based Linux systems. If you’ve ever struggled to scale MySQL beyond a single write node, TiDB offers a solution without requiring you to learn a new query language. It uses the MySQL protocol, so your existing applications, drivers, ORMs, and even the mysql client work with it. Let’s get TiDB up and running.

Every command in this guide was tested on Ubuntu 26.04 and RHEL 10. You’ll learn how to install lazygit, understand its interface, stage and commit changes, create and switch branches, view commit history, resolve merge conflicts, and stash changes—all without leaving a single terminal window. Normally, you’d run git status, use git add -p to stage the right changes, check them with git diff --staged, commit with git commit, and then verify everything with git log --oneline --graph.

If you’ve been looking for a structured way to get started with Linux and IT infrastructure, the Linux Foundation Certified IT Associate (LFCA) is an excellent place to begin. This course explains everything you need to know before you register, including what the exam covers, how the six exam domains are weighted, how much time you should expect to spend preparing, and the most effective way to study. What Is the LFCA?

NetBird creates an encrypted WireGuard network between your devices without requiring a traditional VPN server or manual key exchange. In this article, you’ll learn how to install the NetBird agent on Ubuntu, Debian, RHEL, and Rocky Linux, connect your first device, and check the status to make sure the secure connection is working properly. Imagine you have a laptop, a build server, and a database server, each on a different network behind NAT.

Learn how to install safe-agentic-workflow (SAW) on Linux, add it to a project alongside Claude Code, and use it to process a real task through its multi-agent workflow with Node.js and Git. If you ask Claude Code to fix a single bug, it will usually do a good job. But as projects grow and you start handling multiple bugs across different files over several days, things can become inconsistent.

In the previous chapter, we built a daily health report that runs on a schedule. In this chapter, we'll take the next step by making it event-driven, meaning instead of waiting for a cron job to run, Claude will respond automatically whenever a monitoring alert, GitHub event, or another external trigger occurs, without any manual intervention. n8n is a self-hosted workflow automation tool that connects more than 500 services through a visual node editor.

Hister is a self-hosted search tool that indexes your local files and browser history, so you can quickly search both from one place. We’ve all been there. You know a markdown note, PDF, or config file contains the information you need, but you can’t remember where you saved it. The find command only works if you know the filename, while grep -r has to scan every directory, which can be slow on large folders. Hister solves this by creating an index of your files in advance.

Prometheus stores every metric it collects in its own time-series database (TSDB). Over time, this database grows, and if your disk fills up or the server goes down, you’ll need to know how to manage and recover it. You might install Prometheus, configure a few targets, and let it run for months without any issues.

In the previous chapter, you built a centralized SSH key management system using a Git repository as the single source of truth. You also implemented group-based access control, reviewable onboarding and deprovisioning workflows, and a quarterly access review process. Together, these practices provide a strong and auditable foundation for managing SSH access. This chapter is the final chapter of Module 15 and introduces the current state of the art in SSH security: Zero-Trust SSH.