Werk #19707: omd: Ensure only one backup runs at a time

Component

Site management

Title

omd: Ensure only one backup runs at a time

Date

May 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
2.5.0p8 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Previously, running omd backup while a backup was already in progress on the same site would silently start a second concurrent backup. Concurrent backups are now prevented. A second invocation will fail immediately with an error.

This also fixes a crash introduced on SLES 16.0 (shipped with systemd 257), where the omd command would fail with:

FileNotFoundError: [Errno 2] No such file or directory: '/run/lock/mkbackup'

SLES 16.0 no longer creates /run/lock/ on fresh installs before first boot. The lock file used to coordinate backups has been moved to the site directory, which is always available.

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