Tutorials
In-depth technical tutorials, guides, and infrastructure best practices.
DNSSEC SERVFAIL Fix: Stale DS, Broken Chain, Safe Nameserver Move
DNSSEC SERVFAIL stale DS troubleshooting: use dig +dnssec, +trace, DS, DNSKEY, and RRSIG to find the broken link, fix it, and change nameservers safely.
Speed Up Proxmox VMs: ZFS 2.4 Tuning for NVMe Servers
Learn Proxmox ZFS 2.4 optimization on VE 9.2: size the ARC, pick lz4 or zstd, set volblocksize, test SLOG, protect NVMe, and benchmark safely.
Suricata 8 Performance Tuning on Linux: A Packet Loss Troubleshooting Lab
Learn Suricata 8 packet drop performance tuning step by step. Test each change and check the counters to see what works.
How to Build a Multi-Site Proxmox SDN with WireGuard Fabric in VE 9.2
Learn how to build a multi-site Proxmox SDN with WireGuard fabric in VE 9.2. Step-by-step setup, MTU fix, firewall rules, and tests.
How to Safely Change Authoritative Nameservers Without DNS Outages
Learn how to change nameservers without downtime using a practical DNS migration runbook for TTL planning, zone checks, DNSSEC DS safety, global verification, and rollback.
Set Up the Proxmox VE 9.2 Load Balancer for Smarter VM Placement
Learn the Proxmox dynamic load balancer setup. Enable dynamic CRS, tune settings, add HA rules, and test automatic VM migrations.
How to Fix a Broken Wazuh Cluster Step by Step
Fix Wazuh cluster errors. Learn to repair dropped workers, yellow or red indexer health, TLS errors, API login issues, and full disks.
Proxmox Cluster Troubleshooting: Safe Fixes and Recovery Limits
Fix Proxmox cluster problems fast. Symptom-based steps for quorum loss, Corosync errors, stale nodes, and certificate issues.
How to Install Suricata 8.0 as an Inline IPS on a Linux Dedicated Server
Install Suricata 8 and build a real inline IPS on a Linux dedicated server using AF_PACKET, ET Open rules, EVE JSON logging, and Wazuh integration.
From ESXi to Proxmox VE 9.2: A Low-Downtime VM Migration Guide
Migrate VMware ESXi to Proxmox VE 9.2 with minimal downtime. Step-by-step import, VirtIO drivers, BIOS/UEFI, and rollback steps.
PostgreSQL 18 OAuth: Configure pg_hba.conf, Validators, and Client Auth
Learn PostgreSQL 18 OAuth authentication setup: configure pg_hba.conf, install a validator, set issuer and scope, and connect with psql or app clients.
From Single Server to Cluster: Wazuh 4.14 High Availability Setup
Learn to deploy a fault-tolerant Wazuh 4.14 cluster with multiple manager and indexer nodes.