high-availability Archives - ITFROMZERO

Configuring VMware vSphere HA and DRS: Admission Control and Optimizing Resource Load Balancing Thresholds

By IT From Zero November 8, 2026

A practical guide to configuring VMware vSphere HA Admission Control using Percentage-based mode and optimizing DRS Migration Threshold, based on real-world production experience. Prevents VMs from failing to restart during failover and stops constant vMotion from causing latency issues for database VMs.

Database

Installing & Configuring a MongoDB Replica Set: Production-Ready Automatic Failover

By IT From Zero November 5, 2026

A hands-on guide to deploying a production-grade 3-node MongoDB Replica Set: installation on Ubuntu 22.04, keyfile security, automated failover drills, and resilient connection strings.

Virtualization

How to Install and Configure Built-in Ceph Storage on Proxmox VE: Self-Healing Distributed Storage

By IT From Zero October 30, 2026

A hands-on guide to deploying Ceph Storage on a 3-node Proxmox VE cluster. Covers dedicated 10GbE networking, PLP enterprise SSD optimization, and failover validation during node outages.

Database

MySQL Group Replication Tutorial: Building an Auto-Failover InnoDB Cluster

By IT From Zero October 25, 2026

A step-by-step guide to setting up a MySQL InnoDB Cluster with Group Replication and MySQL Shell, enabling automated detection and failover in 2–3 seconds.

Virtualization

Configuring a Corosync Redundant Network (Dual Ring) on Proxmox VE to Prevent Split-Brain

By IT From Zero October 19, 2026

A step-by-step guide to configuring Corosync Dual Ring on Proxmox VE. Learn how to deploy a redundant network with Kronosnet to protect your High Availability cluster from lost quorum and split-brain scenarios.

Database

Configuring MySQL Read/Write Splitting with ProxySQL: Offload Read Queries Without Touching Application Code

By IT From Zero October 18, 2026

MySQL Master hitting 100% CPU while replicas sit idle? A step-by-step guide to configuring automatic Read/Write Splitting with ProxySQL to save production without touching application code.

Docker

Deploying a Redis Sentinel Cluster with Docker Compose: High Availability Configuration and Automatic Failover

By IT From Zero October 16, 2026

Configure a Redis Sentinel cluster with Docker Compose to automatically detect failures and failover the Master in 5-7 seconds, eliminating SPOFs in caching systems.

Network

How to Configure conntrackd with Keepalived on Linux: Seamless Firewall Session Synchronization

By IT From Zero October 14, 2026

Configure conntrackd alongside Keepalived to synchronize Linux conntrack tables for seamless firewall failover, preserving active TCP and SSH sessions without drops.

Ubuntu

Configuring Keepalived on Ubuntu Server: Setting Up Virtual IP and High Availability for Web Server Clusters

By IT From Zero October 11, 2026

Set up High Availability for web server clusters on Ubuntu using Keepalived and Virtual IP (VIP). Eliminate single points of failure with sub-second failover.