Linux

• ZFS Quotas for Multi-Tenant: Preventing One User From Killing the Pool
• ZFS dRAID Sparing: How Distributed Spares Change Recovery
• MariaDB vs PostgreSQL on HDD: Who Suffers More Under Disk Pressure (and Why)
• Proxmox pveproxy.service failed: 7 common causes and the right fix order
• Ubuntu 24.04: Fix “Too many open files” on Nginx by raising limits the right way (systemd)
• ZFS for MySQL: Avoiding Latency Meltdowns Under Write Bursts
• Email migration: Move mail to a new server with minimal downtime (real steps)
• Debian 13 “Dependency failed” at boot: find the one service blocking startup (case #29)
• ZFS Special VDEVs on SAS SSDs: The Pro Move for Metadata
• Ubuntu 24.04 “Cert verify failed”: Fix CA bundles and intermediate chains properly
• PostgreSQL vs CockroachDB: HA without drama—or HA with new kinds of pain
• ZFS IO Scheduler Choices: mq-deadline vs none for HDD, SSD, and NVMe
• ZFS zfs list -o space: The View That Explains ‘Where Did It Go?’
• Docker Bind Mount Permissions on Windows: The Least Painful Setup
• MySQL vs PostgreSQL for Multi-Tenant SaaS: Tenant Isolation That Survives Growth
• Office VPN Zero Trust: Replace Flat Networks with Role-Based Access
• Email: Outbound reputation tanked — what to stop doing immediately (and fixes)
• Debian 13: “Text file busy” — why deploys fail and how to fix safely (case #57)
• MySQL vs PostgreSQL for High Concurrency: Who Hits the Wall First and Why
• Ubuntu 24.04 tmpfs/ramdisk gone wild: stop it eating RAM (without breaking apps)
• Debian 13 “Segfault” Crashes After Upgrade: Find the Exact Library Mismatch (Case #55)
• ZFS Feature Flag Portability: Avoiding “Cannot Import” Surprises
• MariaDB vs Percona Server: Backup/Restore Speed on a Small VPS
• MySQL vs SQLite Concurrency: Why Writes Become a Traffic Cliff
• Office-to-office access control: enforce “only servers, not the whole LAN” rules
• ZFS atime: The Tiny Toggle That Can Fix ‘Slow Writes’
• ZFS Feature Flags: Compatibility Rules Between Hosts and Versions
• WooCommerce Checkout Not Working: Diagnose SSL, Payments, and Plugin Conflicts
• ZFS logicalused vs used: The Numbers That End Arguments
• PostgreSQL vs SQLite Full-Text Search: When SQLite Surprises You (and When It Doesn’t)
• Office VPN user management: key rotation, revocation, and clean access workflows
• Docker Context: Manage Multiple Hosts Like a Grown-Up
• SMTP TLS handshake fails: fix certs, ciphers, and chains the correct way
• Debian 13: SSHFS vs NFS — pick the one that won’t randomly hang (and configure it right)
• Debian 13: SSH keys rotated — revoke access cleanly and avoid key sprawl (case #13)
• Docker Network MTU Issues: Why Large Requests Fail and How to Fix MTU/MSS
• ZFS Cache Hit Rates: When They Matter and When They Don’t
• Ubuntu 24.04: Disk “hangs” under load — timeout settings that prevent full stalls (case #90)
• ZFS canmount: The Setting That Prevents Boot-Time Surprises
• Apache for WordPress: Modules and Rules That Break Sites (and How to Fix Them)
• MySQL vs PostgreSQL: Docker memory limits—how to stop silent throttling
• DNS: Dig/drill power moves — commands that answer 90% of DNS mysteries
• ZFS Special VDEV Sizing: How Big It Should Be (So You Don’t Regret It)
• ZFS SMART Monitoring: Correlating Drive Warnings with ZFS Errors
• WordPress WebP/AVIF Images Not Showing: Root Causes and the Correct Setup
• ZFS RAIDZ expansion: What’s Possible Today and Best Workarounds
• Proxmox replication failed: why it breaks and how to recover
• Proxmox snapshot stuck: safely cleaning LVM-thin leftovers
• ZFS Encryption + Compression: The Order That Makes Performance
• ZFS dedup: The Checkbox That Eats RAM and Ruins Weekends