Tag: sysadmin

Running Multiple Ollama Models Without Running Out of RAM

Ollama can load one model at a time on limited hardware. How to switch between models, use CPU offloading, and manage VRAM intelligently.

Bulk File Renaming on Linux: rename, vidir, fd

Master bulk file renaming on Linux with rename, vidir, fd, and mmv. The right tool for every scenario from regex rewrites to visual editing.

Disk Space Tools in 2026: Beyond du and df

du and df still work, but Rust-era tools like dust, duf, and fclones make disk triage faster and way less painful in 2026.

Self-Hoster's Disaster Recovery: When Everything Goes Wrong at Once

Build a real disaster recovery plan for your home lab: RTO/RPO explained simply, 3-2-1 backup rule, Proxmox backups, Restic to Backblaze B2, and a runbook template you'll actually use.

Compression in 2026: zstd Changed the Game

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.

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.

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.