Change Linux Hostname: hostnamectl, /etc/hostname and /etc/hosts
Change hostname on Linux with hostnamectl set-hostname, edit /etc/hostname and /etc/hosts, cloud VPS caveats, mail HELO and TLS…
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How to Install Java (OpenJDK) on Linux: Ubuntu, AlmaLinux and JAVA_HOME
Install OpenJDK on Ubuntu and AlmaLinux: JDK vs headless JRE, java -version, set JAVA_HOME in profile.d, alternatives for…
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Linux free Command Explained: Memory, available, Swap and When RAM Is Full
Understand free -h on Linux: total, used, free, available, buffers/cache, swap, MemAvailable vs free column, and when to…
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Bash Aliases on Linux: bashrc, Safe Shortcuts and System-Wide profile.d
Create Bash aliases on Linux: add to ~/.bashrc, source changes, useful examples, avoid dangerous rm aliases, system-wide /etc/profile.d,…
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Linux Load Average Explained: uptime, CPU Cores and When to Worry
Understand Linux load average from uptime and top: 1/5/15 minute values, compare to CPU core count, iowait vs…
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How to Install Python on Linux (3.x, pip, venv and Best Practices)
Install Python 3 on Ubuntu and AlmaLinux: python3, pip, create venv, install requirements.txt, avoid breaking system Python, and…
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WordPress Backup and Restore on Linux: Database, wp-content and Automation
Back up WordPress on Linux: mysqldump wp tables, rsync wp-content, gzip archives, cron/systemd automation, off-site copy, restore order,…
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How to Install Nginx on Linux: Server Blocks, Static Sites and proxy_pass Basics
Install Nginx on Ubuntu and AlmaLinux: package install, sites-available layout, first server block, nginx -t, serve static HTML,…
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Reset Root Password on Linux: GRUB Single-User Mode and Recovery (Ubuntu/RHEL)
Reset forgotten Linux root password: GRUB boot menu, edit linux line init=/bin/bash, remount rw, passwd root, cloud VPS…
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Ubuntu apt update and upgrade: Full Guide (upgrade, full-upgrade, autoremove, reboots)
Master Ubuntu package updates: apt update vs upgrade vs full-upgrade, autoremove, list upgradable packages, apt hold, kernel reboot…
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