Werk #20189: Fix keepalived crash for VRRP instances without a virtual IP address

Component

Checks & agents

Title

Fix keepalived crash for VRRP instances without a virtual IP address

Date

Sep 3, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p14 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p37 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, the keepalived check crashed with

IndexError: list index out of range

This happened when a VRRP instance had no virtual IP address configured. Such a setup is valid. For example, some cloud providers manage the floating IP through an API call instead of letting keepalived assign it.

This has been fixed. The check now handles VRRP instances without a virtual IP address correctly. The check output omits the IP address for that instance.

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