RAID Levels Explained: When Performance Beats Redundancy (and When It Doesn’t)

RHEL Root Password Recovery — Step-by-Step Recovery Tip

This is one recovery method many admins rely on.

How do you handle root password recovery in your environment?

Do you follow a different process, add extra safeguards, or restrict this entirely?

DevOps Interview Questions

Processes vs Services — a Linux concept worth getting right

One Linux concept that quietly improves troubleshooting

A small Linux concept with a big impact in production

Understanding processes vs services in Linux

In production, security issues often come from access that was never cleaned up.

Old sudo rules, temporary access, “just for now” permissions — they tend to stick around.

Who still has sudo access on your systems?

Curious how others review or control this in real environments.

Hardening isn’t about doing everything.
It’s about not missing the basics.

This checklist focuses on the things that actually reduce risk.

Curious what others would 'add or remove' from this list.

#LinuxTeck #linux #DevOps #LinuxAdmin #SysAdminLife #linuxtips #serverrecovery #ITOperations

After my first Linux class…. One Linux class in… should I be this confident already?

👋 Welcome to LinuxTeck

Linux commands used in production
1–2 short posts daily
No spam | No theory | Only practical

Forward to your Linux friends

Running a command in Linux looks simple.
Under the hood, a lot happens very fast.

The shell hands it off.
The kernel steps in.
Memory gets allocated.
A process is scheduled.

Understanding this flow helps explain why things fail, hang, or slow down — not just that they do.

This diagram is a simplified view of that path.

Cron Jobs Made Simple – A Linux Cheat Sheet

Linux gets easier once the system behavior makes sense.

It’s not commands - it’s how processes, files, services, and logs really work.

Linux fundamentals - explained without buzzwords

Linux Architecture – Concepts Every Linux Engineer MUST Understand

Ever wondered what actually happens inside Linux when you run a command?
From kernel to shell to user space — this single visual explains it clearly 👇

🔹 Kernel – Core of Linux (CPU, memory, devices)
🔹 Shell – Interface between user and kernel
🔹 User Space – Where applications run
🔹 Monolithic Kernel – Core services inside kernel space
🔹 Modular Kernel – Loadable modules without reboot
🔹 GNU Tools – The power behind everyday Linux commands

📦 Quick Breakdown
✔️ Kernel manages hardware
✔️ Shell translates commands
✔️ GNU tools make Linux usable

💡 Why this matters?
Because production issues aren’t random.
If you don’t understand Linux architecture, debugging feels impossible.

🎯 Perfect for:
✔️ Linux beginners
✔️ DevOps / SRE aspirants
✔️ Interview preparation
✔️ Daily production work

💬 Comment “ARCH” if you want the next Linux cheat sheet.

Linux architecture. This visual breaks it down simply for anyone learning Linux
or preparing for system and DevOps roles.

Accessing Linux – Methods Every Linux Engineer MUST Know

Ever wondered how engineers actually access Linux servers securely?
From console to SSH to CLI vs GUI — this single visual breaks it down 👇

🔹 Console – Direct system access (no network needed)
🔹 Terminal – Command interface inside an OS
🔹 SSH – Secure remote login over network
🔹 GUI – Visual interface (easy, but limited)
🔹 CLI – Command line (fast, scriptable, powerful)
🔹 Safe Login – Keys, limited users, no root access

📦 Quick Comparison
✔️ Console = emergency access
✔️ SSH = daily production access
✔️ CLI = speed + automation
✔️ GUI = learning & basic tasks

💡 Why this matters?
Because production servers aren’t desktops.
If you rely on GUI, you’re not ready for real Linux environments.

🎯 Perfect for:
✔️ Linux beginners
✔️ DevOps / SRE aspirants
✔️ Interview preparation
✔️ Real-world server access

💬 Comment “ACCESS” if you want the next Linux cheat sheet.

Linux Directory Structure – Folders Every Linux Engineer MUST Know

Ever wondered what each Linux directory is actually used for?
This single visual explains the Linux filesystem layout clearly 👇

🔹 / – Root of the filesystem (everything starts here)
🔹 /etc – System & application configuration files
🔹 /var – Logs, cache, and changing data
🔹 /home – User home directories
🔹 /usr – User binaries, libraries, documentation
🔹 /opt – Optional and third-party software

📦 Filesystem Hierarchy Standard (FHS)
✔️ Defines where files should live
✔️ Keeps Linux systems consistent
✔️ Makes troubleshooting predictable

💡 Real-world usage
✔️ Check logs → /var/log
✔️ Edit configs → /etc
✔️ User data → /home
✔️ Installed packages → /usr, /opt

💡 Why this matters?
Because deleting files blindly breaks servers.
If you don’t know the directory structure, you don’t control the system.

🎯 Perfect for:
✔️ Linux beginners
✔️ DevOps / SRE aspirants
✔️ Interview preparation
✔️ Production troubleshooting