- Ubuntu 24.04: rsyslog vs journald — choose logging without losing important events
- Debian 13: Memory leaks in services — find them with the least disruption (case #43)
- Ubuntu 24.04 servers: Snap vs apt — where Snap quietly causes pain (and what to do)
- Email: Brute force on IMAP/SMTP — lock it down without locking yourself out
- Ubuntu 24.04: Cron Runs Manually but Not on Schedule — PATH/Env Gotchas and Fixes
- Debian 13: Thermal throttling ruins throughput — prove it and fix cooling/power limits
- Debian 13 IRQ storms and weird latency: check irqbalance and fix interrupts
- Ubuntu 24.04: sudo is slow — DNS/hostname fixes that remove the delay (case #66)
- Ubuntu 24.04 systemd unit overrides: fix services cleanly without editing vendor files (case #8)
- Debian 13: Journald ate your disk — cap logs without losing what matters
- Fail2ban for Mail: Rules That Actually Catch Attacks
- Ubuntu 24.04 “Connection reset by peer”: prove whether it’s client, proxy, or server (case #74)
- Debian/Ubuntu Web Root Permissions: Stop 403s Without Making Everything 777 (Case #9)
- Debian 13: nftables rules “don’t work” — load order and conflicts, fixed for good
- Debian 13 auditd without killing disks: practical settings for sane auditing
- Debian 13 kernel tainted: what it means and when you should care
- Ubuntu 24.04 Watchdog resets: detect silent hangs before they cost you uptime (case #18)
- Debian 13 “Segfault” Crashes After Upgrade: Find the Exact Library Mismatch (Case #55)
- Debian 13: SSH keys rotated — revoke access cleanly and avoid key sprawl (case #13)
- Ubuntu 24.04: LVM thin pool 100% — save your VMs before it’s too late
- Debian 13: NFS timeouts — the mount options that improve stability (and when they don’t)
- Ubuntu 24.04 “Clock skew detected” — fix time sync and stop build/deploy failures (case #46)
- Debian 13 “Too many open files”: the correct systemd limit fix (not just ulimit)
- Debian 13: “Unit masked” surprises — unmask safely and fix why it got masked (case #47)
- Debian 13: NTP Works but Drift Persists — Hardware Clock and Chrony Tweaks (Case #79)
- Debian 13: “Filesystem full” broke your DB — the recovery steps that actually work (case #59)
- Ubuntu 24.04 “Stale file handle” on NFS: why it happens and how to stop it
- Ubuntu 24.04: Certbot renews but your app still fails — fix permissions and reload hooks
- Ubuntu 24.04 Disk Hangs Under Load: Timeout Settings That Prevent Full Stalls (Case #30)
- Debian 13 minimal firewall profile: what to allow and what to drop (no paranoia)
- Debian 13 “Address already in use”: find who owns the port (and fix cleanly)
- Ubuntu 24.04: SSH worked yesterday, now “Permission denied” — fix the 5 most common causes
- Ubuntu 24.04: PHP-FPM keeps crashing — the log line you must find (and the fixes)
- Debian 13: Nginx suddenly returns 403/404 — permissions vs config, how to tell instantly
- Ubuntu 24.04 “Illegal instruction”: CPU flags vs binaries — fix deployments cleanly (case #56)
- Ubuntu 24.04: “Failed to get D-Bus connection” — fix broken sessions and services (case #48)
- Debian 13: Service won’t start after config change — fix it by reading the right log lines (case #1)
- Debian 13: systemd timers vs cron — switching for reliability (and avoiding common traps)
- Ubuntu 24.04: “Failed to start …” — the fastest systemd triage workflow (case #62)
- Ubuntu 24.04: Stop rebooting to “fix” issues — how to isolate root causes properly (case #60)
- Debian 13: AppArmor blocks your service — allow what you need without disabling security
- Debian 13: Permission denied on bind mounts — fix UID/GID mapping the clean way (case #41)
- Ubuntu 24.04 “Failed to start …”: the fastest systemd triage workflow (case #2)
- Debian 13: NTP Works but Drift Persists — Hardware Clock and Chrony Tweaks (Case #19)
- Ubuntu 24.04: Services in restart loop — stop the loop and catch the root error
- Debian 13: Core dumps fill your disk — keep debugging value, drop the bloat
- Debian 13: SSHFS vs NFS — pick the one that won’t randomly hang (and configure it right) (case #21)
- Ubuntu 24.04: logrotate isn’t rotating — the one config mistake that keeps biting people