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I've got a server running Postgresql 9.1 replication. I wrote a script which prints out the current replication lag (master inserts a unix timestamp every 60s, and the slave compares it to the current timestamp).

I've added

extend replag /usr/local/bin/check_lag_quietly.sh

to snmpd.conf, and restarted the snmpd service, but when I snmpwalk the host, either from localhost, or from another machine on the network, I can see all of the other OIDs, but not this one.
If I do SNMP-Get as

tom.oconnor@charcoal-black:~$ snmpget -v2c -cpublic dns-2 UCD-SNMP-MIB::extTable
UCD-SNMP-MIB::extTable = No Such Object available on this agent at this OID

Then it can't find the OID there either.

Net-SNMP version 5.4.2.1, Ubuntu 10.04.

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Just checking the basics: is the check_lag_quietly.sh script set as executable, and is it and the entire /usr/local/bin/ path have the read and execute permissions set correctly for the user that the snmpd daemon is executing under? –  dan_linder Jun 14 '12 at 18:07
    
-rwxrwxr-x 1 root root 444 Jun 12 14:48 check_lag_quietly.sh –  Tom O'Connor Jun 14 '12 at 18:09
    
drwxr-xr-x 2 root root 4.0K Jun 12 14:48 bin –  Tom O'Connor Jun 14 '12 at 18:09
    
The "No Such Object available" leads me to believe that the UCD-SNMP-MIB::extTable may be incorrect. Other on-line examples show using NET-SNMP-EXTEND-MIB::nsExtendObjects. From this RedHat example. –  dan_linder Jun 14 '12 at 18:10
    
When you restart the snmpd service, does anything get logged to /var/log/messages? Does the snmpd init.d have a check config option? –  becomingwisest Jun 14 '12 at 23:43

1 Answer 1

up vote 2 down vote accepted
+50

On Debian with 5.4.3 snmpd dosn't seem to load all it's modules by default, by adding:

-I interface,ifTable,ifXTable,cpu,cpu_linux,hw_mem,extend,versioninfo,snmp_mib,ip,at,system_mib

to the command line for snmpd (note the 'extend' in there), i can:

snmpwalk -Ou  -v 1 -c public localhost nsExtendOutput2Table

which returns the default 'extend' examples:

enterprises.netSnmp.netSnmpObjects.nsExtensions.nsExtendObjects.nsExtendOutput2Table.nsExtendOutput2Entry.nsExtendOutLine."test1".1 = STRING: Hello, world!
enterprises.netSnmp.netSnmpObjects.nsExtensions.nsExtendObjects.nsExtendOutput2Table.nsExtendOutput2Entry.nsExtendOutLine."test2".1 = STRING: Hello, world!
enterprises.netSnmp.netSnmpObjects.nsExtensions.nsExtendObjects.nsExtendOutput2Table.nsExtendOutput2Entry.nsExtendOutLine."test2".2 = STRING: Hi there

Which is close to what you want.

You can get a list of all the snmpd modules with:

snmpd -Dmib_init -H

I guess the real question here is "How do i get snmpd to load all it's modules by default"

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Ah ha! Many thanks! –  Tom O'Connor Jun 15 '12 at 13:14

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