Werk #1045: Gracefully restart check_mk helpers in case of memory leak

Component Core & Setup
Title Gracefully restart check_mk helpers in case of memory leak
Date Jul 10, 2014
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 1.2.5i5
Level Prominent Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When using the Check_MK Micro Core in combination with inline SNMP then in certain rare situations the check_mk helper processes leak memory. We suspect the leak to be in the SNMP libs but this is just an assumption.

This fix now watches the size of each check_mk helper. If the memory usage (VM size) of the process grows by more then 50% compared to the size after the first 20 hosts being checked, then the helper silently restarts itself and leaves a message in var/log/check_mk/cmc-helper.log.

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