Blog
Breakdowns, measurements and operational practice — useful before you hit the problem.
8 October 2026free -h: how to read server memory and why "free" is almost always low
Why a server shows only 372 MB "free" and whether to worry. free -h, available, cache and swap explained on live output.
6 October 2026fail2ban on Ubuntu 24.04: protect SSH from password guessing without locking yourself out
Install fail2ban on Ubuntu 24.04, change the ban time and learn to unban yourself. Output from a live server.
5 October 2026How to check your Ubuntu or Debian version and how long it gets security updates
Which commands show your Ubuntu and Debian version, how it differs from the kernel version and until which year it is patched.
24 September 2026NVMe vs SSD vs HDD on a VPS: what actually differs, and how to test yours
"NVMe" on a pricing page says little about real speed. How drive types differ in practice and how to test yours with fio.
23 September 2026Umami vs Plausible: self-hosted analytics instead of Google Analytics on a VPS
Umami vs Plausible: two self-hosted alternatives to Google Analytics. How they differ, and how to deploy the lighter one on a VPS.
22 September 2026How much CPU and RAM does a server actually need?
How many cores and how much RAM you really need: starting numbers by workload and commands to check on a running VPS.
18 September 2026Common Linux server problems and how to fix them
One entry point instead of seven searches: a symptom-cause-command table with links to a full write-up for each problem.
18 September 2026Passwordless sudo (NOPASSWD) on Ubuntu: scoping it to one command safely
How to allow one sudo command without a password via /etc/sudoers.d without opening a security hole.
16 September 2026Ubuntu says Permission denied: fixing file permissions with chmod and chown
Permission denied on Ubuntu: how rwx permissions work, what chmod numbers mean, and why chmod -R 777 is a bad idea.