High Availability Archives

MySQL Replication with GTID: Master-Slave Setup and Safe Production Failover

October 18, 2026

Discover how switching to GTID-based MySQL replication eliminates fragile binary log coordinates during production incidents. Follow this real-world guide to configure master-slave clusters and execute zero-data-loss failover safely.

Networking

Linux Network Bonding and 802.3ad LACP: Configure Link Aggregation for High Availability and Bandwidth

October 18, 2026

Eliminate single-cable network failures and bandwidth bottlenecks on Linux hosts. This guide covers how to set up IEEE 802.3ad LACP bonding with Netplan and nmcli, verify switch negotiation, and run non-disruptive failover tests.

Linux

High Availability with Keepalived on Linux: Virtual IP and Automated Failover

October 10, 2026

When your primary web node crashes at 2 AM, every second of downtime counts. Here is how to configure Keepalived on Linux with a floating Virtual IP and automated health checks for sub-two-second, seamless failover.

Networking

High Availability Virtual IP with Keepalived and VRRP on Linux: A 6-Month Production Review

October 3, 2026

A single gateway crash can bring down an entire stack. Here is a 6-month production review of implementing High Availability Virtual IP using Keepalived and VRRP on Linux, featuring real metrics, configurations, and post-mortem lessons.

HomeLab

Proxmox 2-Node High Availability: Using a Raspberry Pi as a Quorum Device

September 23, 2026

Turn your 2-node Proxmox lab into a resilient HA cluster. Use a Raspberry Pi as a QDevice to prevent split-brain issues and keep your VMs running during a failure.

Networking

Stop the Outages: Building High Availability Kea DHCP on Linux

September 7, 2026

Eliminate network downtime by setting up Kea DHCP High Availability. This step-by-step guide covers load balancing, control agent configuration, and failover testing.

DevOps

Multi-Region Kubernetes: A Hands-on Guide to Global Load Balancing with K8gb

August 17, 2026

Regional outages don't have to mean downtime. This guide shows you how to use K8gb to implement automated, multi-region DNS failover for your Kubernetes clusters.

Networking

4G/5G USB Modem Failover on Ubuntu Server with ModemManager and NetworkManager

July 17, 2026

After three fiber outages in six months, I configured automatic 4G/5G USB modem failover on Ubuntu Server using ModemManager and NetworkManager. Six months later, it's handled seven more disruptions without a single manual action — here's the exact setup I'm still running in production.

Networking

Deploy BFD with FRRouting on Linux: Achieve Sub-Second Network Failover

July 17, 2026

Don't let slow OSPF or BGP timers crash your uptime. Discover how to use BFD and FRRouting on Linux for ultra-fast, sub-second network failure detection.

Database

Scaling PostgreSQL: A Practical Guide to Pgpool-II Load Balancing and HA

June 8, 2026

Build a resilient PostgreSQL cluster with Pgpool-II. This guide walks through configuring Load Balancing, Watchdog HA, and automated failover to handle traffic spikes without downtime.