(since I sent two complaints to the list just now, I feel the need to be constructive)
If you use Cisco networking gear, you might be familiar with CDP. CDP is a Cisco proprietary protocol that issues packets from a Cisco switch to all attached devices. When you're on a Cisco device, you can detect neighboring switches and routers and what port they're plugged in to using CDP. There's also a Linux tool called cdpr which will briefly listen on a port for CDP packets from the switch. (http://www.monkeymental.com/) I just use the stock Ubuntu package and it works like a champ. example output: # cdpr -d eth0 cdpr - Cisco Discovery Protocol Reporter Version 2.2.1 Copyright (c) 2002-2006 - MonkeyMental.com Using Device: eth0 Waiting for CDP advertisement: (default config is to transmit CDP packets every 60 seconds) Device ID value: switchZZ.foo.com Addresses value: 10.20.22.6 Port ID value: GigabitEthernet0/6 What's great here, is that cdpr is telling me what switch the host is plugged in to, and what port on that switch. The cdpr package also has options for reporting to a central server, but that's what I use puppet for, right? So I just cron a nightly cdpr run. (not that I move ports that often, but it's a simple thing to grab from time to time), and then I wrote a facter fact to roll these stats back up in to the puppet yaml. I'm not a ruby master, but the following did the trick: ------------------------------------------ # Facter fact to read output from cdpr and report back values require 'facter' cdprfile = '/tmp/cdpr.out' f = File.new(cdprfile) parseme = f.read.gsub(/\n/,' ') f.close switch = parseme.gsub(/.*Device ID\s+value:\s+(\S+)\s.*/,'\1') port = parseme.gsub(/.*Port ID\s+value:\s+(\S+)\s.*/,'\1') if switch.length > 40 switch = '' end if port.length > 40 port = '' end # Debug #print "Switch:\t", switch, "\n" #print "Port:\t", port, "\n" Facter.add("cdp_device") do setcode do switch end end Facter.add("cdp_port") do setcode do port end end ------------------------------------------ So after I add this fact to fact sync with puppet I can just walk my yaml and get a mapping of server to switch ports.. Over-simplified walk example: # grep cdp /var/lib/puppet/yaml/node/* /var/lib/puppet/yaml/node/widgetXX.foo.com.yaml: cdp_port: GigabitEthernet0/9 /var/lib/puppet/yaml/node/widgetXX.foo.com.yaml: cdp_device: switch25-1.foo.com /var/lib/puppet/yaml/node/widgetYY.foo.com.yaml: cdp_port: GigabitEthernet0/33 /var/lib/puppet/yaml/node/widgetYY.foo.com.yaml: cdp_device: switch22-1.foo.com I hope some other network/sysadmin types find this useful. Cheers, Joel --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-users@googlegroups.com To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en -~----------~----~----~----~------~----~------~--~---
