Hi, I'm trying to build a net-snmp subagent to monitor the proper operation of an ETL system. Things I would like to monitor include new lines added by the process to an Oracle 11g table. Since there seem to be several different ways of doing this, I would like to get feedback from the community as to which approach to chose.
My idea is to extend the net-snmp agent using the Perl NetSNMP::agent library. I notice however that the examples provided in the documentation (http://search.cpan.org/~hardaker/NetSNMP-agent-5.0401/agent.pm) do not work well, both have the agent lock. It works better when one removes the loops, as is done in the tutorial (http://www.net-snmp.org/wiki/index.php/Tut:Extending_snmpd_using_perl), the offending lines being the following: -------------------------------- my $running = 1; while($running) { $agent->agent_check_and_process(1); } $agent->shutdown(); -------------------------------- and -------------------------------- $agent->main_loop(); -------------------------------- However this is surprising, is the documentation out of date? And then if these lines are removed the only difference remaining between the two code examples is the 'AgentX' => 1 parameter in new NetSNMP::agent call. Is this sufficient indeed to create an AgentX subagent? What difference does it make precisely? Besides now if I don't have a loop I can't figure how to do what I want, namely: 1) Have a Perl sub-agent monitor at regular time interval (eg every 15 min) and keep in cache some aspects of the system, among them the number of new lines in the Oracle table, probably obtained using JDBC; 2) Answer SNMP GET requests on a specific branch (netSnmpPlaypen to start with) 3) Emit SNMP traps when certain conditions is met (eg, the number of new lines is less than x) 4) Avoid to start a new process and database connection for each update, i.e., use a long-running subagent and SQL prepared statements. Can somebody help me with this? Thanks a lot, Chris
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