Linux

• Ubuntu 24.04 swapiness and vm.dirty settings: the small tunings that actually matter
• Proxmox No-Subscription Repository: Configure Repos Without Breaking Upgrades
• Two Internet Links at the Office: VPN Failover on MikroTik Without Chaos
• ZFS Small Random Writes: Why Mirrors Often Beat Parity
• ZFS Silent Corruption: What ZFS Detects That RAID Often Misses
• Proxmox “bridge port has no carrier”: Fast Troubleshooting for Cable, Switch, and Driver Issues
• CSS for Markdown Content: Sane Defaults That Don’t Break Production
• WordPress Is Slow: Find the Bottleneck Step by Step (Server, Plugins, or Database)
• Proxmox 2FA Lockout: How to Avoid It (and How to Recover Fast)
• SMTP Throttling: Prove It’s the Provider and Adapt Cleanly
• WordPress “Max execution time exceeded”: why it happens and safe fixes
• ZFS zdb -C: Reading Pool Config Straight From Disk
• SPF Softfail vs Fail: Pick the Setting That Won’t Backfire
• Proxmox storage “not available on node”: why it exists but you can’t use it
• DMARC quarantine vs reject: when to switch and how to roll it out safely
• WordPress “Allowed memory size exhausted”: fix it for good
• WordPress 403 Forbidden: Diagnose and Fix Permissions, WAF Rules, and Blocking
• Pure HTML/CSS Landing Page: Hero, Features, Pricing, FAQ (Docs-Style)
• Docker DNS Caching Lies: Flush the Right Cache (Inside vs Outside Containers)
• MySQL vs PostgreSQL Replication Lag: Why It Happens and How to Reduce It
• How to migrate from VMware ESXi to Proxmox VE (step-by-step): VMs, disks, VLANs, downtime
• Proxmox “cannot initialize CMAP service”: Corosync/pmxcfs troubleshooting checklist
• MySQL vs PostgreSQL: the honest “website DB” pick (based on real bottlenecks)
• Proxmox VFIO “device is in use”: detaching PCI devices from the host the right way
• Proxmox restore speed: tuning PBS, compression choices, and why restores are slow
• Docker: Clean up safely — reclaim space without deleting what you need
• Toast Notifications UI with CSS: Stacking, Animations, Placement Variants
• Active Directory over VPN: What Breaks First (DNS, Time, Ports) and How to Fix It
• MySQL vs MariaDB: slow query log—turn one hour of logs into a 2× speedup
• MariaDB vs PostgreSQL Query Plans: Catch the Real Bottleneck, Not Symptoms
• MySQL vs MariaDB on NVMe: redo logs, flush policy, and IO capacity done right
• Proxmox ZFS Degraded: Replace a Disk Without Collateral Damage
• ZFS Sequential Reads: Tuning for Maximum Streaming Throughput
• MySQL vs MariaDB: WordPress 504s—who collapses first under a traffic spike
• ZFS logbias: Latency vs Throughput—Pick What You Actually Need
• MariaDB vs Percona Server Replication: Where Edge Cases Bite
• Ubuntu 24.04: Docker + UFW = Surprise Open Ports — Close the Hole Without Breaking Containers
• Debian 13 minimal firewall profile: what to allow and what to drop (no paranoia)
• MySQL vs PostgreSQL Disk-Full Incidents: Who Recovers Cleaner and Faster
• Responsive Typography That Looks Good: clamp() Done Right
• Debian/Ubuntu Random Timeouts: Trace the Network Path with mtr/tcpdump and Fix the Cause (Case #64)
• Docker “connection refused” between services: fix networks, not symptoms
• Ubuntu 24.04: Random disconnects — debug NIC drops and offloads without superstition
• Debian 13 “Device busy” on umount: find the holder instantly (lsof/fuser workflow)
• ZFS ashift Mismatch Detection: How to Check Existing Pools
• Ubuntu 24.04 APT is slow: cache/proxy tricks that speed up office updates
• WordPress emails go to spam: SPF/DKIM/DMARC explained and configured
• Debian 13 “Address already in use”: find who owns the port (and fix cleanly)
• WordPress wp-config.php Mistakes: Common Misconfigurations and Fixes
• MariaDB vs ClickHouse: Offload Analytics When Reports Are Slow