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 |
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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.