Linux

• Email: SPF includes are a mess — how to simplify without breaking mail
• MySQL vs MariaDB on NVMe vs SATA SSD: why your DB still feels slow (and how to prove it)
• Debian 13 Split DNS for VPN and LAN: a clean setup that won’t break after reboot
• Ubuntu 24.04: IPv6 Breaks Random Sites — Fix Dual-Stack Properly (Don’t Just Disable IPv6)
• ZFS fio for Databases: Testing Sync Writes Without Lying to Yourself
• WireGuard split tunneling: route only what you need (and keep the rest local)
• ZFS zpool import -d: Finding Pools When Device Paths Change
• Proxmox GPU Passthrough Black Screen: UEFI/OVMF, ROM Issues, Reset Bugs, and Proven Fixes
• ZFS “Pool Full” Recovery: What Breaks First and How to Come Back
• PPTP Is a Trap: Why You Should Avoid It and What to Use Instead
• ZFS zpool initialize: Making New Drives Behave Better From Day One
• Docker IPv6 Leaks: Prevent “Oops, It’s Public” Exposure
• Ubuntu 24.04: Services in restart loop — stop the loop and catch the root error
• MySQL vs CockroachDB: distributed SQL on small servers—the latency tax nobody mentions
• Fix hreflang Errors in Multilingual WordPress (and Restore Google Language Targeting)
• Debian 13 mdadm RAID Degraded: Replace and Rebuild Without Data Loss
• Site-to-Site VPN: The Routing Checklist That Prevents One-Way Traffic
• Proxmox LDAP/AD Login Fails: Where the Auth Chain Breaks and How to Fix
• Fix WordPress “exceeds upload_max_filesize”: raise limits correctly (PHP, Nginx/Apache, hosting)
• Debian 13: Proxy settings break apt/curl — where they hide and how to clean them up
• Email: DKIM fails — why the signature breaks (and how to fix it fast)
• Docker GPU in Containers: Why It Fails and How to Fix It
• Proxmox Firewall Rules Don’t Apply: iptables vs nftables Conflicts Explained
• WordPress Not Sending Email: SMTP Setup That Actually Delivers
• DNS CNAME Chains: When They Become a Performance and Reliability Problem
• Proxmox iSCSI login failed: target reachable but no LUN — how to fix it
• Proxmox SMB/CIFS Is Slow for VM Disks: Why It’s Bad and What to Use Instead
• Container Queries Practical Guide: Component-First Responsive Design
• Proxmox got slower after upgrade: the first checks that usually reveal the cause
• ZFS zpool iostat -r: Reading Latency Like a Pro
• WordPress Stuck in Maintenance Mode: Remove It Safely and Prevent Repeats
• Mobile Docs Navigation Drawer That Doesn’t Break: Overlay, Scroll Lock, and Focus
• WireGuard on a Router: NAT Mistakes That Break LAN Access (and Fixes)
• Email: “554 spam detected” — clean up reputation without wasting weeks
• Proxmox VE for beginners: the first 10 settings to fix after install (security, storage, backups)
• Docker Observability Minimum: Metrics and Logs That Catch Failures Early
• Dovecot IMAP Login Fails: Where Auth Breaks and How to Fix It
• Debian 13 SMART warnings: which attributes actually predict failure (and what to do)
• Debian 13: Core dumps fill your disk — keep debugging value, drop the bloat
• WordPress “Cookies are blocked”: what it really means and how to fix it
• PCIe passthrough on Proxmox vs ESXi: GPUs, HBAs, NICs — what’s easier and what’s faster
• Debian 13: Filesystem mounted read-only after errors — recovery steps that minimize damage
• ZFS zfs receive: The Import Side That Breaks When You Ignore Properties
• ZFS L2ARC on SATA SSD: When It’s Worth Doing
• DKIM Key Rotation: How to Rotate Safely With Zero Drama
• Proxmox LVM-thin “out of data space”: free space without destroying VMs
• Convert VMDK to QCOW2 for Proxmox: qemu-img commands, performance tips, and common errors
• WordPress “Database Needs Repair”: What It Means and How to Fix It Safely
• Proxmox I/O wait at 100%: find the noisy VM/container and stop host freezes
• Debian 13: SSHFS vs NFS — pick the one that won’t randomly hang (and configure it right) (case #21)