Linux systems engineer with 8+ years running production web infrastructure. John writes hands-on tutorials about server administration, Nginx, Docker and everything that keeps a VPS healthy — every guide is tested on a live server before it's published.
183 posts
What you will read?1 Step 1: Use `uname -r` for the current kernel2 Step 2: Use hostnamectl for clean output3 Step 3: Check installed kernel packages4 Step 4: Read from /proc/version5 Step 5: See the full kernel boot log (optional) If you’re running Debian 12 or any recent Debian release, checking your current Linux kernel…
What you will read?1 Step 1: Update package index2 Step 2: Install 7zip core package3 Step 3: Verify the installation 7zip is a popular compression tool used for extracting and creating `.7z`, `.zip`, `.tar`, and many other archive formats. It’s lightweight, fast, and fully available in Debian’s repositories. If you work with archives often, 7zip…
What you will read?1 Step 1: Update your system2 Step 2: Install Terminator3 Step 3: Launch Terminator4 Step 4: Set Terminator as default terminal (optional)5 Step 5: Customize Terminator Terminator is a feature-rich terminal emulator for Linux that allows multiple terminal panels in one window. It’s perfect for users who run several commands or manage…
What you will read?1 Step 1: Download Alma Linux ISO2 Step 2: Create new VM3 Step 3: Set VM resources4 Step 4: Start the installation5 Step 5: Log into AlmaLinux AlmaLinux is a stable, RHEL-compatible Linux distro, perfect for running on virtual machines. Installing it on VMware is straightforward if you follow the right steps. …
What you will read?1 Step 1: Update system packages2 Step 2: Install Postfix3 Step 3: Reconfigure Postfix (optional)4 Step 4: Open SMTP ports5 Step 5: Check Postfix status Setting up an SMTP server on Ubuntu 25.04 lets your system send emails — for alerts, password resets, cron jobs, and more. The most common and reliable…
What you will read?1 Step 1: Save active settings2 Step 2: Export to readable file3 Step 3: Create binary backup4 Step 4: Download backup files5 Step 5: Restore when needed MikroTik routers don’t automatically save your settings. That means if the router reboots or loses power before saving, any unsaved changes will be lost. MikroTik…
What you will read?1 Step 1: Check firewall status2 Step 2: Open the TCP port3 Step 3: Reload firewall rules4 Step 4: Confirm the port is open5 Step 5: Test external access By default, Red Hat Enterprise Linux uses firewalld to manage network access. If you want to allow access to a specific TCP port,…
What you will read?1 Step 1: Enable EPEL2 Step 2: Install Speedtest CLI3 Step 3: Run the speed test4 Step 4: Use Ookla’s official tool5 Step 5: Run advanced tests You can check internet speed on CentOS 8 easily using terminal-based tools without a browser or GUI. Step 1: Enable EPEL Enable the EPEL repo…
What you will read?1 Step 1: Check current version2 Step 2: Install the new version3 Step 3: Configure alternatives4 Step 4: Switch the default version5 Step 5: Verify the change Debian 12 comes with Python 3 by default, but sometimes you need to use a different version — for compatibility, development, or running specific tools.…
