Healthcheck vs Restart Policy: The Difference Matters
Your container crashes and restarts. Your app is broken but says it's healthy. These are two different problems. Here's the distinction.
Tag: sysadmin
All the articles with the tag "sysadmin".
Linux Suspend and Hibernate: Teaching Your Machine to Take a Nap Without Dying
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.
Sysctl Tuning: The Linux Kernel Knobs That Actually Matter
Learn which sysctl parameters actually improve Linux server performance. Network tuning, memory management, and a ready-to-use sysctl.conf for Docker hosts.
The Reverse Proxy Timeout That Kills Long Uploads
Your upload works fine locally. It times out through NGINX. The client closes the connection. Here's why.
Time Is a Lie and Chrony Is Here to Fix It: NTP for Home Labs
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.
SSH Keys in 2026: Ed25519 Is the Standard
RSA SSH keys are aging out. Why Ed25519 is the 2026 default, how to generate one in 30 seconds, and how to audit and rotate your legacy keys safely.
The Header Your Reverse Proxy Keeps Dropping
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: Security Updates Without the 3am Reboot
Apply Linux kernel security patches without rebooting using kpatch and Canonical Livepatch. Keep servers secure and online simultaneously — here's the practical setup guide.
You Should Be Testing Your Restores
You've got backups. Great. But do you know if they actually work? RTO and RPO mean nothing if you've never actually restored.
Log Rotation for Self-Hosted Apps
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: Mandatory Access Control Without the Existential Dread
AppArmor vs SELinux explained: what mandatory access control actually does, how to write AppArmor profiles with aa-genprof, navigate SELinux labels and audit2allow, and when to use each.
Restic vs Borg vs Kopia: Backup Tools for People Who've Lost Data Before
Restic vs Borg vs Kopia compared: deduplication, compression, backends, and practical backup scripts. Choose the right tool for your Linux home lab or server backups in 2026.