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
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.5i5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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