Knowledge base category
Linux
91 practical guides in Linux.
How to Set Up zram on a Small VPS
Configure zram on Ubuntu with kernel and swap checks. Understand compressed memory limits, monitor real use and avoid unsafe swap-file changes.
LinuxHow to Find Services That Need a Restart After Updates with needrestart
Find services using outdated libraries with needrestart on Ubuntu. Read restart reports, review automatic restart policy and plan maintenance safely.
LinuxHow to Limit a Linux Service’s Memory with systemd
Limit a Linux service with systemd MemoryHigh, MemoryMax and swap controls. Check cgroup support, diagnose pressure and remove only your own policy.
LinuxHow to Protect SSH with CrowdSec on Ubuntu
Protect SSH with CrowdSec on Ubuntu. Connect log detection to firewall enforcement and test temporary blocking without losing administrator access.
LinuxHow to Sync Files Between Servers with Syncthing
Sync a test folder between two servers with Syncthing. Verify peer identity, folder IDs and deletion behavior, and keep independent backups.
LinuxSwap on a VPS: When It Saves You and When It Kills Performance
Learn what Linux swap really does, when it saves your VPS from the OOM killer, and when it hurts. Set up a swapfile and tune swappiness, step by step.
LinuxFacing “Too Many Open Files” error? File Descriptors Explained
What file descriptors are, why the 'Too Many Open Files' (EMFILE) error happens, and how to check, raise, and permanently fix the limit. With a live demo.
Linuxlogrotate Explained: Stop Log Files From Filling Your Disk
Learn how logrotate keeps Linux log files from filling your disk. Configure rotation, compression, and copytruncate, force a rotation, and test it safely.
LinuxUnderstanding Load Average in Linux: How to Calculate CPU Usage on Multi Core Server
Load average is not CPU usage. It is the run queue length. How to read the three numbers, compare them to your core count, and spot when processes are waiting on disk or...
LinuxUnderstanding Swap in Linux: What Happens When Linux Runs Out of RAM
Your server has RAM to spare but Linux is swapping anyway. swappiness, anonymous memory vs page cache, and the OOM killer explained with actual commands.
LinuxCPU Steal Time: What Happens When Your VPS Neighbors Hog the Host
Your server should be fast but everything feels sluggish. CPU looks fine. Memory looks fine. Logs show nothing. The culprit is CPU steal time.
LinuxWhat Is Cloud-Init and How Does It Work? The Complete Guide
cloud-init automates Linux server setup at boot. Here is how it works and how to use it on any VPS, including those without a cloud provider.