High Availability Options for Nagios XI 2024 and 2026

This document is a guide detailing the methods for achieving High Availability (HA) with Nagios XI. The primary objective of HA is to ensure that if the primary Nagios XI instance fails, another instance will automatically take over monitoring tasks without interruption. The document outlines various options available for implementing HA solutions, including VMware High Availability for those using Nagios XI as a virtual machine in a vSphere environment. It also mentions open-source solutions that can be configured using tools like Pacemaker and DRBD, although the specifics of these configurations are not covered within this document. Additionally, it suggests that administrators should familiarize themselves with related documents to enhance their understanding of HA options and ensure proper monitoring infrastructure. The guide concludes by directing users to additional resources for support and documentation.