GnTech Blog

Windows Server 2025 DHCP failover topology with DHCP01 and DHCP02 replicating a shared IPv4 scope

Windows Server 2025 DHCP Failover — Replicated Scopes and Verification

Step-by-step Windows Server 2025 DHCP failover guide: install DHCP, authorize servers in AD, create scopes, configure load-balance or hot-standby failover, replicate scopes, and verify leases.

Windows Server 2025 DNS replication topology with DC01 and DC02 hosting AD-integrated DNS zones

Windows Server 2025 DNS Server Replication — AD-Integrated Zones

Step-by-step Windows Server 2025 DNS replication guide: AD-integrated zones, DNS role install, forward/reverse zones, forwarders, secure dynamic updates, GUI and Server Core paths, and verification.

Windows Server 2025 secondary domain controller topology with DC01, DC02, replication, DNS, and client failover

Windows Server 2025 Secondary Domain Controller — Add DC02 to Existing AD

Step-by-step guide to adding DC02 as a secondary Windows Server 2025 domain controller: preparation, AD DS promotion, DNS, Global Catalog, replication checks, SYSVOL validation, and client failover testing.

Windows Server 2025 domain controller topology with AD DS, DNS, clients, and verification tools

Windows Server 2025 Domain Controller — AD DS Install and Verification

Step-by-step Windows Server 2025 domain controller deployment: static IP, AD DS installation, DNS configuration, domain promotion, OU/user setup, client join testing, and post-install verification.

Docker Compose Production Patterns for Homelabs — Healthchecks, Profiles, Secrets

Practical Docker Compose patterns for reliable homelab deployments. Healthchecks, conditional dependencies, profiles for optional services, secrets management, extension fields, and restart policies with real compose files.

Ansible Homelab Automation — Infrastructure as Code for Docker and Linux Servers

Practical Ansible homelab automation guide — playbook structure, Docker container deployment with community.docker, ansible-vault secrets, Jinja2 templates, Git workflow, and full project template.

Docker MACVLAN and IPVLAN — Giving Containers Real LAN IPs in Your Homelab

Step-by-step Docker MACVLAN and IPVLAN guide — give containers real LAN IPs for Pi-hole, Home Assistant, Scrypted. Host communication fix, Proxmox gotcha, multi-network Compose examples.

Proxmox PCIe Passthrough — GPU, NVMe, and HBA Setup for Homelabs

Complete Proxmox VE PCIe passthrough guide — GPU for Jellyfin transcoding, NVMe direct access, SAS HBA for NAS VMs. Kernel configs, vfio-pci, IOMMU groups, and working Proxmox VM settings.

Docker Container Resource Limits — CPU, Memory, and I/O Constraints for Homelabs

Practical Docker container resource limits guide for homelabs — CPU quota/pinning, memory hard/soft limits, swap control, block I/O throttling, cgroup v2 differences, and Docker Compose examples.

Linux Sysctl Kernel Tuning for Homelabs — Network, Memory, and Docker Performance

Complete Linux sysctl kernel tuning guide for homelab servers. Network buffers, BBR congestion control, OOM management, fs.inotify limits, and Docker-specific sysctl configs.