CPU and I/O Priority with nice and ionice
Manage Linux process priority with nice (CPU) and ionice (I/O). Learn priority levels, renice running processes, and avoid tanking server performance.
Tag: sysadmin
All the articles with the tag "sysadmin".
Linux File Descriptor Limits: When 1024 Isn't Enough
File descriptors and why that 1024 limit kills your server. How to check, raise, and debug fd exhaustion.
Why Your Docker Logs Are Eating Your Disk
Docker's default JSON logging driver writes unbounded logs to disk. Learn how to set log rotation and reclaim your storage.
The `at` Command: One-Time Scheduled Tasks in Linux
Schedule one-off Linux tasks with `at` instead of cron. Learn syntax, queue management, batch jobs, and when to use it for delayed reboots and reminders.
Why Your Docker Container Ignores Ctrl+C
PID 1 doesn't receive signals by default. Learn why Ctrl+C fails in containers and fix it with tini or exec form CMD.
Optimize Ubuntu Logs: btmp Log Rotation
btmp logs failed logins and grows forever on internet-facing servers. Set up logrotate to keep it under control before your disk fills up.
Finding the PID of a Process Using a Specific Port in Linux
Something's squatting on port 8080 and you need to know what. ss, lsof, and fuser one-liners to find and kill the culprit fast.
Differences Between nohup, disown, and & in Linux
nohup, disown, and & all keep processes running after logout — but they work differently. Here's which one to reach for and why.
the lost+found Directory in Linux
What is lost+found and why does it exist? fsck puts recovered file fragments there after a crash — and no, you can't delete it.
Switch Ubuntu to Hardware Enablement (HWE)
The Ubuntu HWE kernel brings newer hardware support to LTS releases — how to switch from generic to HWE and what you gain.
Essential Linux Commands for Daily Use
The Linux commands every sysadmin reaches for daily — file ops, process management, networking, and text manipulation you can't live without.
Ubuntu Debian packages have been kept back error
Packages have been kept back during apt upgrade — what it means, why it happens, and how to safely install or hold those packages.