check_openmanage: timeout vs. SNMP timeout

[Andrew Daugherity]

I'm troubleshooting an issue where one server is occasionally not responding (I think it's a firewall or snmpd issue, not this plugin), and I noticed that changing the timeout option to check_openmanage did not affect how long it took before receiving the
  SNMP CRITICAL: No response from remote host A.B.C.D

message.  Looking at the code I see the timeout option is _not_ passed to the Net::SNMP session object, so the SNMP connection timeout uses the default value (5 seconds according to the Net::SNMP man page, but 10 seconds in my testing).

If I pass the timeout option to the Net::SNMP->session object like so:
====
diff --git a/check_openmanage b/check_openmanage
index b6abec5..3558ed4 100755
--- a/check_openmanage
+++ b/check_openmanage
@@ -860,6 +860,7 @@ sub snmp_initialize {
         '-port'     => $opt{port},
         '-hostname' => $opt{hostname},
         '-version'  => $opt{protocol},
+        '-timeout'  => $opt{timeout},
        );
 
     # Setting the domain (IP version and transport protocol)
====
Then it does obey the timeout option and I instead get the
  PLUGIN TIMEOUT: check_openmanage timed out after 30 seconds

message.  This might be by design though, to have a shorter SNMP timeout and different error messages, but it was perplexing to me why the timeout option was seemingly not working.  Perhaps a different option for the SNMP timeout, or a documentation clarification, is a better way?


Thanks,

Andrew Daugherity
Systems Analyst
Division of Research, Texas A&M University

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