All the articles with the tag "sysadmin".
Backups and disaster recovery are not the same thing. Learn RTO and RPO, the 3-2-1 rule, Proxmox and Restic backups, and a runbook that survives a real outage.
zstd is as fast as gzip with near-xz compression ratios. Here's why you should drop bzip2 forever and how to use zstd in 2026.
Ollama holds models in VRAM after every request. Set keep_alive, force an unload through the API, and cap how many models stay resident at once.
Your container crashes and restarts. Your app is broken but says it's healthy. These are two different problems. Here's the distinction.
Linux suspend vs hibernate explained: sleep states, swap setup, initramfs resume hook, wake-on-LAN, lid close behavior, and fixing common hibernate failures on modern Linux systems.
Your upload works fine locally. It times out through NGINX. The client closes the connection. Here's why.
Set up Chrony for NTP time sync in your home lab. Covers chrony.conf, chronyc tracking, stratum levels, LAN NTP server setup, and why correct time matters more than you think.
Your backend can't see the client IP because the reverse proxy silently dropped it. Here's why and how to fix it right.
Kernel live patching applies CVE fixes to a running kernel with no reboot, using kpatch or Canonical Livepatch. Setup for Ubuntu and RHEL, plus what it can't fix.
You've got backups. Great. But do you know if they actually work? RTO and RPO mean nothing if you've never actually restored.
Your app is logging to a single file. It's 50GB now. Here's how to rotate logs before your disk dies.
AppArmor vs SELinux: what mandatory access control actually does, writing AppArmor profiles with aa-genprof, SELinux labels and audit2allow, and when to use each.
