high-availability – ITFROMZERO

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Configuring Proxmox VE Replication with ZFS: High Availability and Disaster Recovery Without a SAN

By admin September 8, 2026

Proxmox VE Replication uses ZFS send/receive to sync VM disks between nodes every 15 minutes — a practical High Availability alternative to a SAN at zero cost. Covers step-by-step setup via CLI and Web UI, real-world failover testing, and automated monitoring to catch failures before they become incidents.

VMware

Configuring vSphere Proactive HA: Automatically Migrate VMs Before Hardware Failure

By admin September 1, 2026

Proactive HA is a vSphere feature that automatically vMotions VMs before hardware completely fails, based on alerts from Dell OMIVV or HPE OneView. This guide covers step-by-step configuration with PowerCLI scripts, drawn from real-world experience managing an 8-host ESXi cluster.

Centos

Network Teaming on CentOS Stream 9: A Solution to Prevent Network Downtime and Increase Server Bandwidth

By admin September 1, 2026

Don't let a single faulty cable crash your server. Detailed guide on configuring Network Teaming on CentOS Stream 9 for redundancy and Enterprise-grade bandwidth.

VMware

Deploying vSAN Witness Appliance for 2-Node Clusters: A Cost-Effective HA Solution

By admin July 26, 2026

A detailed guide on deploying the vSAN Witness Appliance for VMware 2-node clusters. Save on hardware costs while ensuring high availability for your system.

MySQL

Configuring MySQL Active-Active Replication: Bidirectional Data Sync and Concurrent Write Conflict Handling

By admin July 2, 2026

A step-by-step guide to configuring MySQL Active-Active (Master-Master) Replication — from setting up binlog users and configuring auto_increment to prevent ID collisions, to handling write conflicts and practical routing tips from a 50GB production database.

Centos

HAProxy Layer 7 Load Balancer on CentOS Stream 9: Installation, Configuration, and Backend Health Checks

By admin June 30, 2026

A practical guide to installing HAProxy as a Layer 7 load balancer on CentOS Stream 9, covering SELinux boolean configuration, firewalld setup, backend health checks, and real-time monitoring via the Stats page. Includes a complete configuration example and a real-world failover test scenario.

VMware

Configuring vCenter Server High Availability (vCenter HA): Eliminating the Single Point of Failure in Your vSphere Environment

By admin June 20, 2026

A step-by-step guide to configuring vCenter Server High Availability (vCenter HA) on VCSA 8.0, covering the Active-Passive-Witness architecture, HA network configuration, failover testing, and practical operational tips from a production environment. Eliminate the single point of failure in your vSphere management layer with automatic failover in 4–8 minutes.

MySQL

MySQL Semi-synchronous Replication: Zero Data Loss Without Group Replication

By admin June 13, 2026

MySQL Semi-synchronous Replication ensures zero data loss for production databases by requiring at least one slave to acknowledge receipt of the binlog before the master commits. This article compares async, semi-sync, and Group Replication, analyzes when each is appropriate, and provides a step-by-step deployment guide from enabling the plugin to real-world monitoring.

Database

Deploying MariaDB Galera Cluster: A Multi-master High Availability Solution for Production

By admin May 16, 2026

A detailed guide on setting up a 3-node MariaDB Galera Cluster. This synchronous multi-master solution ensures your database system stays online and secure against hardware failures.

MySQL

MySQL Router: The ‘Gatekeeper’ Enabling Automatic Failover and Fault Tolerance for InnoDB Clusters

By admin May 4, 2026

Don't let your database become a single point of failure. This guide covers how to set up MySQL Router to automate routing and failover for production InnoDB Clusters.