On Wed, Jan 16, 2008 at 11:05:47AM -0000, Mike Rowell wrote:
One word..
Devmon
indeed, Devmon is the right thing to use currently. But let me take the opportunity to give you a quick idea of what's coming in Hobbit.
The current snapshot of Hobbit can fetch data through SNMP, and one of the things I am using it for is to collect data about switches. We use Nortel's Passport-8600 switches here, but it can be configured for any kind of SNMP-enabled host. So just picking up the current load of the switch (cpu, memory, fabric utilisation) and the traffic on each port is done with this config entry in hobbit-snmphosts.cfg:
[pp8600.foo.com]
version=2
community=public
p8600system
ifmib=!*!"p8600system" and "ifmib" are actually pointers into hobbit-snmpmibs.cfg which has the details of what SNMP objects to retrieve (just showing a couple of items):
[p8600system]
Descr = SNMPv2-MIB::sysDescr.0
UpTime = RFC1213-MIB::sysUpTime.0
BufferUtil = RAPID-CITY::rcSysBufferUtil.0 /rrd:GAUGE
CpuUtil = RAPID-CITY::rcSysCpuUtil.0 /rrd:GAUGE
[ifmib]
keyidx (IF-MIB::ifDescr)
keyidx !IF-MIB::ifIndex!
ifHCInOctets = IF-MIB::ifHCInOctets /rrd:COUNTER
ifHCOutOctets = IF-MIB::ifHCOutOctets /rrd:COUNTERAs you can see this is a bit complex, but it is fairly easy to set up when you have access to a system like the one you're monitoring, and can walk through the SNMP data with the "snmpwalk" utility (from the Net-SNMP package).
Notice the "ifmib=!*!" and "keyidx !IF-MIB::ifIndex!" lines ? These are indices that pick out one (or all) of the switch ports. Here it matches all ports, but you can also have "ifmib=(eth0)" to fetch data for the eth0 device, or "ifmib={10.45.0.102}" to grab data from the device which has the IP 10.45.0.102 assigned. You can have multiple ways of indexing an SNMP table, so you can pick out the interesting entries the easiest way.
The interesting data is automatically graphed, that is what the "/rrd:..." is for. No alerting yet, but that is work-in-progress.
As I said, it's in the current snapshot so feel free to experiment with it. Feedback is welcome.
Regards, Henrik