Red Hat Bugzilla – Bug 69125
lm_sensors support for ucd_snmp
Last modified: 2015-03-04 20:11:00 EST
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Description of problem:
The client, LLNL, needs to have lm_sensors support for the ucd_snmp snmpd. A
long time ago RH supplied an unsupported patch which provides this
functionality. They would like to roll this into the main distribution but
lm_sensors is exceedingly dangerous on some systems. Evidently it can burn out a
thinkpad or something like that.
So LLNL had me code up a way that the same binary can be used on a system with
or without lm_sensors. What I did was use dlopen to load the sensors library if
it exists. If not then that part of the mib is never even registered.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.snmpwalk host community host.hrSensors
Actual Results: no sensor readings are listed
Expected Results: sensor readings are listed
Let me know if I need to make more sophisticated logic for deciding when to use
the lm_sensors functionality.
Created attachment 65708 [details]
The original usupported lm_sensors patch
Created attachment 65709 [details]
The patch that I coded up which dlopens the lm_sensors library
The sensor-dl.patch applies on top of the sensor.patch. The spec file
modifications were extremely minor. I simply added, the patch to the sources
list and to the prep section. The patch applies with -p1.
James Antill posits that it is weird to have a piece of software change behavior
simply because another package is installed. He suggested adding a configuration
option which would try to enable that functionality. If that functionality is
not available i.e. snmpd cannot load the library or resolve all the symbols then
spit out something to syslog.
Errata packages have been done, waiting for QA to pick them up and finalize them.
Read ya, Phil
*** Bug 76509 has been marked as a duplicate of this bug. ***
An errata has been issued which should help the problem described in this bug report.
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen
this bug report if the solution does not work for you.