Werk #3286: Fixing possible logging issues when using datasource programs for monitoring

Component

Core & setup

Title

Fixing possible logging issues when using datasource programs for monitoring

Date

Mar 11, 2016

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

1.4.0i1	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
1.2.8b5	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When calling datasource programs for monitoring they are executed as subprocesses of Check_MK. Check_MK as passing all filedescriptors except stdout and stderr to the subprocess. So if a subprocess was doing something strange with them it could happen that this influenced the handling within Check_MK.

This could, for example, confuse the communication between the CMC and the Check_MK keepalive helper processes.

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