zendisc runs forever, never attempts to contact remote host

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sPOiDar

19 posts since
Jan 5, 2009

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Aug 31, 2011 4:15 AM

I'm trying to discover a device, but when running zendisc, I get the following output:

2011-08-31 18:09:26,375 DEBUG zen.ZenDisc: Run in foreground, starting immediately.

2011-08-31 18:09:29,226 DEBUG zen.ZenDisc: Run in foreground, starting immediately.

2011-08-31 18:09:29,238 DEBUG zen.pysamba: client ntlmv2 auth is now no

2011-08-31 18:09:29,238 DEBUG zen.ZenDisc: Starting PBDaemon initialization

2011-08-31 18:09:29,239 INFO zen.ZenDisc: Connecting to localhost:8789

2011-08-31 18:09:29,241 DEBUG zen.ZenDisc: Logging in as admin

2011-08-31 18:09:29,249 INFO zen.ZenDisc: Connected to ZenHub

2011-08-31 18:09:29,249 DEBUG zen.ZenDisc: Setting up initial services: EventService, DiscoverService

2011-08-31 18:09:29,250 DEBUG zen.ZenDisc: Chaining getInitialServices with d2

2011-08-31 18:09:29,252 DEBUG zen.ZenDisc: Loaded service EventService from zenhub

2011-08-31 18:09:29,252 DEBUG zen.ZenDisc: Loaded service DiscoverService from zenhub

2011-08-31 18:09:29,252 DEBUG zen.ZenDisc: Queueing event {'severity': 0, 'component': 'zendisc', 'agent': 'zendisc', 'summary': 'started', 'manager': 'host.domain.tld', 'device': 'localhost', 'eventClass': '/App/Start', 'monitor': 'localhost'}

2011-08-31 18:09:29,253 DEBUG zen.ZenDisc: Total of 1 queued events

2011-08-31 18:09:29,254 DEBUG zen.ZenDisc: Calling connected.

2011-08-31 18:09:29,254 DEBUG zen.ZenDisc: fetching monitor properties

2011-08-31 18:09:29,267 DEBUG zen.ZenDisc: Getting threshold classes...

2011-08-31 18:09:29,268 DEBUG zen.ZenDisc: Loading classes ['Products.ZenModel.MinMaxThreshold']

2011-08-31 18:09:29,269 DEBUG zen.ZenDisc: Fetching default RRDCreateCommand...

2011-08-31 18:09:29,270 DEBUG zen.ZenDisc: Getting collector thresholds...

2011-08-31 18:09:29,279 DEBUG zen.thresholds: Updating threshold ('high event queue', ('localhost', ''))

2011-08-31 18:09:29,279 DEBUG zen.thresholds: Updating threshold ('zenmodeler cycle time', ('localhost', ''))

2011-08-31 18:09:29,279 DEBUG zen.thresholds: Updating threshold ('zenperfsnmp cycle time', ('localhost', ''))

2011-08-31 18:09:29,279 DEBUG zen.thresholds: Updating threshold ('zenping cycle time', ('localhost', ''))

2011-08-31 18:09:29,279 DEBUG zen.thresholds: Updating threshold ('zenprocess cycle time', ('localhost', ''))

2011-08-31 18:09:29,280 DEBUG zen.ZenDisc: Getting collector plugins for each DeviceClass

2011-08-31 18:09:29,325 INFO zen.ZenDisc: Looking for nnn.nnn.nnn.nnn

2011-08-31 18:09:29,326 DEBUG zen.ZenDisc: Found IP nnn.nnn.nnn.nnn for device host.domain.tld

2011-08-31 18:09:29,328 DEBUG zen.ZenDisc: Scanning device with address nnn.nnn.nnn.nnn

2011-08-31 18:09:29,328 DEBUG zen.ZenDisc: Doing SNMP lookup on device nnn.nnn.nnn.nnn

2011-08-31 18:09:34,288 DEBUG zen.Ping: unexpected pkt xxx.xxx.xxx.xxx <ICMP packet 0 0>

2011-08-31 18:09:35,301 DEBUG zen.Ping: unexpected pkt yyy.yyy.yyy.yyy <ICMP packet 0 0>

2011-08-31 18:09:36,301 DEBUG zen.Ping: unexpected pkt xxx.xxx.xxx.xxx <ICMP packet 0 0>

.....

And that's it - the zen.Ping messages keep rolling in as pings come back from those hosts, but nothing more happens on this thread, and dumping traffic from the monitoring host to the remote host shows that absolutely no attempt to contact the remote side is made. I'm really stumped and would appreciate any suggestions - the Python code is a little beyond my familiarity at that point.

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jmp242
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1. Aug 31, 2011 8:40 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

I haven't personally seen this, but have heard reports of some firewalls not liking the Zenoss custom created ping packets. They're not the same as the OS created ones, and the various test pings are misleading . . .

If you delete the zendisc job, start a packet caputure and re-add the job, you really never see *any* packets from zenoss to the remote device?

--
James Pulver
Information Technology Area Supervisor
LEPP Computer Group
Cornell University

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sPOiDar
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2. Aug 31, 2011 9:20 AM (in response to jmp242)
Re: zendisc runs forever, never attempts to contact remote host

I tried earlier without any firewall, but there are absolutely no packets sent from zenoss to the remote device - that's what has me stumped.

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Shane Scott
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3. Aug 31, 2011 9:28 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

sPOiDar:

Do you have Netscreens or SSGs along the path?

Dont worry about unexpected packet notices- this only means Zenoss recieved an unexpected icmp packet. This occurs when someone or something is pinging the Zenoss server.

Best,
--Hackman238

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sPOiDar
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4. Aug 31, 2011 9:53 AM (in response to Shane Scott)
Re: zendisc runs forever, never attempts to contact remote host

Yeah, I wasn't concerned about the ping debugs, just included them for completeness - everything pretty much just stops after 'Doing SNMP lookup on device'.

To answer your question, I can't be certain - the Zenoss host and host to be monitored are Xen VMs hosted with a third party - there is a router of some sort between them, but I don't know what it is.

With that said, intermediary devices must be irrelevant at this point, since no traffic whatsoever leaves the Zenoss host destined for the remote host.

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sPOiDar
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5. Aug 31, 2011 10:52 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

I traced into the execution to zendisc.py line 624-626:

                yield self.discoverDevice(ip,
                                     devicepath=self.options.deviceclass,
                                     prodState=self.options.productionState)

In which it fires the job off, then sits in WmiEPollReactor for ever, never receiving the response...

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Shane Scott
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6. Aug 31, 2011 12:02 PM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

sPOiDar:

I've never seen a situation where zendisc would not acctually execute its tests. What version of Zenoss are you running? Whats the patch level? Have you made any code changes by hand? What means did you use to determine zendisc isn't sending out and traffic?

Best,
--Hackman238

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sPOiDar
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7. Aug 31, 2011 7:06 PM (in response to Shane Scott)
Re: zendisc runs forever, never attempts to contact remote host

I'm using the Zenoss stack package on Ubuntu Server 10.04.3 (up to date as of today), Zenoss 3.1.0-0. No local code changes.

System has a single interface, used:
tcpdump -n -i eth0 -A -s 0 host nnn.nnn.nnn.nnn

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sPOiDar
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8. Sep 1, 2011 1:20 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

Okay, so if I run zendisc with --no-snmp it adds the device fine, I can then remodel and everything works (including SNMP), so this is definitely specific to zendisc.

It doesn't quite feel like I've got enough to file a bug report with, but this is definitely a problem for us, and one that we need to solve. Anyone have any pointers on where to go from here to get more information?

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Shane Scott
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9. Sep 1, 2011 9:29 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

sPOiDar:

Thats very bizarre. Have you tried running zendisc from the cli in debug mode? This might tell us more. On the master, `su zenoss` then `zendisc run --now -d {yourdevice} --deviceclass {TheDeviceClassYouWant} -v10`

Best,
--Hackman238

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sPOiDar
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10. Sep 1, 2011 9:52 AM (in response to Shane Scott)
Re: zendisc runs forever, never attempts to contact remote host

Yeah, that's how I got the original log, and how I tested with --no-snmp (and a debugger to find where it's looping) :-/

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Shane Scott
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11. Sep 1, 2011 9:58 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

sPOiDar:

Gotcha. What I might reccomend is to stop zenoss, clear out your logs (save them if you like), then

`su zenoss`
`zeoctl start`
`zopectl fg` - make note of any failed modules, etc

On another console-
`su zenoss`
`zenhub start -v10`
`zenmodeler start -v10`
Finally, try running zendisc again.

If anything suspicious is in any of the newly created logs then tar them up after sanitising ip's, etc and post them.

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mrchippy
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12. Sep 1, 2011 11:52 AM (in response to sPOiDar)
Re: zendisc runs forever, never attempts to contact remote host

sPOiDar,

Is this happening against any box you try to discover? If it's specific to that box, can you try an snmpwalk against it and tell me what you get back?

Thanks,
Chip Holden
Zenoss engineering

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sPOiDar
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13. Sep 1, 2011 12:29 PM (in response to Shane Scott)
Re: zendisc runs forever, never attempts to contact remote host

@hackman238 - I've done this, no obvious errors, I'll parse the logs more closely when I'm awake to make sure but it all looks sane. Behaviour remains the same though.

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sPOiDar
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14. Sep 1, 2011 12:32 PM (in response to mrchippy)
Re: zendisc runs forever, never attempts to contact remote host

@mrchippy - It happens for at least the couple that I've tried. Running snmpwalk works as expected, and as I say - zendisc doesn't generate any traffic whatsoever to the host. As I said earlier, if I manually discover with --no-snmp, then model the host I get all the SNMP data populated immediately, and everything works from then on.

The problem appears to be that when zendisc fires off discoverDevice it goes into a poll for a response, but whatever process discoverDevice is meant to trigger never reports back, and nothing at all seems to happen.

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Aug 31, 2011 4:15 AM

zendisc runs forever, never attempts to contact remote host

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