Werk #16927: lnx_bonding failing with 'head: *: No such file or directory' if no bonding interface is configured

Component

Checks & agents

Title

lnx_bonding failing with 'head: *: No such file or directory' if no bonding interface is configured

Date

Jul 22, 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
2.5.0p10 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The Linux and OpenWrt agents collect bonding information by reading the files in /proc/net/bonding. This directory exists whenever the bonding kernel module is loaded, even if no bonding interface is actually configured.

In that case the directory is empty, and the agent tried to run head on an unmatched shell glob. This wrote an error such as head: ./*: No such file or directory to the agent output.

The agents now only read the bonding files when at least one bonding interface is present, so no spurious error is emitted.

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