Infrastructure, Cloud, Security & Automation

Linux Logging & Troubleshooting — journalctl, rsyslog, logrotate & Fixing Problems
A clear, practical guide to reading logs and diagnosing services, boot and network issues, with copy-ready commands (AlmaLinux 9 / RHEL 9)

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Logs are the system talking ...

Task Automation on Linux — cron, at & Shell Scripting Basics
A clear, beginner-friendly guide to scheduling jobs and writing your first scripts, with copy-ready examples (AlmaLinux 9 / RHEL 9)

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Why automate?
If you do a task more than twice by hand ...

Linux Security — SELinux & Firewalld Explained Simply
A clear, practical guide to enforcing modes, contexts, booleans, firewall zones and rich rules, with copy-ready commands (AlmaLinux 9 / RHEL 9)

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Two guards stand between attackers and your server ...

SSH Administration on Linux — Server, Keys, Hardening, SCP, SFTP & Tunneling
A clear, practical guide to secure remote access and file transfer, with copy-ready commands (AlmaLinux 9 / RHEL 9)

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What is SSH, in plain words?
SSH (Secure Shell) is an ...

Linux System Services with systemd — Services, Targets, Timers & Startup
A clear, beginner-friendly guide to managing what runs on your system, with copy-ready commands (AlmaLinux 9 / RHEL 9)

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What is systemd, in plain words?
systemd is the "manager ...

Linux Networking Made Simple — IP, CIDR, Subnetting, nmcli/nmtui, Routes, DNS & Troubleshooting
A beginner-friendly guide explained in plain language, with real commands you can copy (AlmaLinux 9 / RHEL 9 — NetworkManager)

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New to networking? Start ...

Swap Management on Linux — Create, Extend & Make Swap Persistent
A complete hands-on guide — swap files, swap partitions and LVM swap, with tuning tips (AlmaLinux 9 / RHEL 9)

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What is swap and why do you need it?
Swap is disk space the kernel uses ...

LVM on Linux — Physical Volumes, Volume Groups, Logical Volumes & Snapshots
A complete hands-on guide — build, grow, shrink and snapshot storage without downtime (AlmaLinux 9 / RHEL 9)

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Why bother with LVM instead of plain partitions?
Because raw ...

Linux Storage Management

MBR (Master Boot Record)

Older partitioning scheme.

Features:


Supports disks up to 2 TB
Maximum 4 primary partitions
Used by older systems


Check disk layout:


fdisk -l


GPT (GUID Partition Table)

Modern partitioning scheme.

Features:


Supports ...

Linux Process Management

ps

Used to view running processes.

Show all processes:


ps -ef


Example Output:


root 1 0 0 10:00 ? 00:00:01 systemd
apache 1200 1 0 10:05 ? 00:00:00 httpd


top

Real-time system and process monitor.

Start top:


top


Shows:


CPU usage
Memory usage ...