---
title: "About the App Primary Failover"
slug: "installation-app-primary-failover"
updated: 2026-03-04T12:03:00Z
published: 2026-03-04T14:37:41Z
canonical: "docs.senhasegura.io/installation-app-primary-failover"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.senhasegura.io/llms.txt
> Use this file to discover all available pages before exploring further.

# About the App Primary Failover

The **App Primary Failover** is a feature designed to enhance the reliability of cluster architectures with three or more members.

This is an optional feature to automatically ensure the presence of a single designated instance serving as the primary in your cluster environment.

              Important

              

When you enable **App Primary Failover**, administrators can't manually choose the primary instance. The feature takes care of this automatically to ensure high availability in the cluster.

For instructions on how to activate and deactivate this feature, access the [How to activate and deactivate the App Primary Failover](/v4-2/docs/installation-how-to-activate-and-deactivate-the-app-primary-failover) documentation.