Werk #16176: postfix: Fix Postfix status monitoring for agents run in Docker

Component Checks & agents
Title postfix: Fix Postfix status monitoring for agents run in Docker
Date Mar 13, 2024
Checkmk Version 2.4.0b1 2.3.0b4 2.2.0p26
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Affected Editions
2.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.2.0p26 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Previously, Checkmk agent used the data from /proc to determine if Postfix instance is running. Since docker containers don't have permissions to read /proc, the agent always reported the Postfix instance as 'not running'.

This resulted in CRIT 'Postfix status' service even if Postfix instance was running correctly.

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