Linux

• Debian 13: Swap Is Growing and Performance Tanks — Memory Pressure Fixes That Actually Help
• Ubuntu 24.04: Hostname/hosts mismatch breaks sudo/ssh — the boring fix that saves hours
• Proxmox “Not a Bootable Disk”: BIOS/UEFI Boot Order, Disk Flags, and a Fast Recovery Path
• ZFS redundant_metadata: When More Metadata Copies Actually Matter
• Docker Read-only Containers: Harden Without Breaking Your App
• Ubuntu 24.04 ext4 vs XFS Recovery: Which Tool to Run First (and Why)
• Debian 13 filesystem check takes forever: what’s normal, red flags, and fixes (case #31)
• Ubuntu 24.04 Memory Ballooning Surprises: Set Sane Limits and Stop Swap Storms (Case #16)
• Docker host networking risks: when it’s worth it and how to limit damage
• MariaDB vs PostgreSQL for Multi-Tenant Hosting: Stop One Client Site from Killing Everyone
• ZFS vdev width planning: Why More Disks per VDEV Has a Cost
• Ubuntu 24.04: Apache vs Nginx confusion — fix port binding and proxy loops cleanly
• Proxmox Ceph “mon down/out of quorum”: restoring monitors and quorum without panic
• IPsec NAT-T: why VPN won’t come up behind NAT and how to fix it
• MySQL vs PostgreSQL: why the same query is fast in one and brutal in the other
• ZFS Boot Pool Recovery: Getting a System Back After a Bad Update
• Ubuntu 24.04: SSH Sessions Drop Randomly — Keepalive Settings That Actually Help
• Debian/Ubuntu “Connected, but no internet”: Routing, Gateway, and Policy Routing Fixes
• Docker Backup Encryption: Keep Secrets Safe Without Breaking Restores
• Docker Compose Rollback: The Fastest Path Back From a Bad Deploy
• Proxmox Ceph OSD Down: Disk vs Network vs Service — Fast Identification
• Stability vs Performance at Home: Where to Draw the Line
• WordPress .htaccess Broke the Site: Restore a Safe Default Properly
• Docker IPv6 in Containers: Enable It Properly (and Avoid Surprise Leaks)
• WordPress Sitemap Not Indexing: Common Causes and Fixes
• Proxmox live migration fails: what to verify for network, CPU flags, and storage
• WordPress 503 Service Unavailable: what to check when the site is down
• Proxmox vzdump backup failed: 10 real causes and how to check in order
• Proxmox SMART warnings: which attributes actually predict failure
• Email Queue Keeps Growing — Find the Culprit Before Mail Stops
• MariaDB vs SQLite Performance: Why “Fast Locally” Can Be Slow in Production
• Office VPN Quality Tests: Measure Latency, Jitter, and Loss to Prove ISP Problems
• VPN security: 12 mistakes that turn a “private tunnel” into an incident
• Ubuntu 24.04: DKMS broke after kernel update — recover drivers without downtime
• Ubuntu 24.04: Disk is “full” but df looks fine — inode exhaustion explained (and fixed)
• VoIP over VPN: Stop Robotic Audio with MTU, Jitter, and QoS Basics
• Docker NFS Volumes Timing Out: Mount Options That Actually Improve Stability
• ZFS ZVOL vs Dataset: The Decision That Changes Your Future Pain
• Docker Compose: Environment variables betray you — the .env mistakes that break prod
• Google Search Console “Page with redirect”: When It’s Fine and When It Hurts
• MariaDB vs SQLite for Write Bursts: Who Handles Spikes Without Drama
• Dovecot: maildir vs mdbox — pick storage that won’t haunt you later
• Debian 13 “Broken pipe” errors: when it’s harmless and when it’s your first warning (case #75)
• Proxmox LXC Network Broken: The veth/tap Checklist That Actually Finds the Cause
• PostgreSQL vs Percona Server: operations—what’s simpler to run at 3AM
• ZFS zfs promote: Untangling Clone Chains Without Data Loss
• Proxmox PBS “datastore not found”: why PVE can’t see it and how to fix
• ZFS Immutable Backups: Readonly + Snapshot Policies That Actually Hold Up
• Debian 13 policy routing: debug ip rule and ip route without pain
• Ubuntu 24.04 “Stale file handle” on NFS: why it happens and how to stop it