Has anybody a solution to this?
If I specify more than 10 ssh plugins in zCollectorPlugins, the modeling
process hangs, times out and fires an error event (CHANNEL_OPEN_FAILURE:
Authentication failure).
Code:
ERROR:zen.SshClient:CHANNEL_OPEN_FAILURE: Authentication failure
DEBUG:zen.ZenModeler:Sending event {'manager': 'localhost', 'severity': 4,
'device': 'taxco', 'eventClass': '/Cmd/Fail', 'component': 'zenmodeler',
'agent': 'zenmodeler', 'summary': 'CHANNEL_OPEN_FAILURE: Authentication
failure'}
Traceback (most recent call last):
File "home/zenoss/instances/zenoss/lib/python/twisted/python/context.py",
line 37, in callWithContext
File "home/zenoss/instances/zenoss/lib/python/twisted/conch/ssh/service.py",
line 42, in packetReceived
File "/home/zenoss/instances/zenoss/Products/DataCollector/SshClient.py",
line 393, in ssh_CHANNEL_OPEN_FAILURE
connection.SSHConnection.ssh_CHANNEL_OPEN_FAILURE( self, packet )
File
"home/zenoss/instances/zenoss/lib/python/twisted/conch/ssh/connection.py", line
115, in ssh_CHANNEL_OPEN_FAILURE
--- <exception caught here> ---
File "home/zenoss/instances/zenoss/lib/python/twisted/python/log.py", line
48, in callWithLogger
File "home/zenoss/instances/zenoss/lib/python/twisted/python/log.py", line
33, in callWithContext
File "home/zenoss/instances/zenoss/lib/python/twisted/python/context.py",
line 59, in callWithContext
File "home/zenoss/instances/zenoss/lib/python/twisted/python/context.py",
line 37, in callWithContext
File "/home/zenoss/instances/zenoss/Products/DataCollector/SshClient.py",
line 492, in openFailed
message= 'Open of %s failed (error code %d): %s' % \
exceptions.AttributeError: ConchError instance has no attribute 'code'
On the monitored remote host, sshd logs an error: "no more sessions".
Code:
Feb 1 22:22:37 taxco sshd[27932]: debug1: input_session_request
Feb 1 22:22:37 taxco sshd[27932]: debug1: channel 9: new [server-session]
Feb 1 22:22:37 taxco sshd[27932]: debug1: session_new: session 9
Feb 1 22:22:37 taxco sshd[27932]: debug1: session_open: channel 9
Feb 1 22:22:37 taxco sshd[27932]: debug1: session_open: session 9: link with
channel 9
Feb 1 22:22:37 taxco sshd[27932]: debug1: server_input_channel_open: confirm
session
Feb 1 22:22:37 taxco sshd[27932]: debug1: server_input_channel_open: ctype
session rchan 10 win 131072 max 32768
Feb 1 22:22:37 taxco sshd[27932]: debug1: input_session_request
Feb 1 22:22:37 taxco sshd[27932]: debug1: channel 10: new [server-session]
Feb 1 22:22:37 taxco sshd[27932]: debug1: session_open: channel 10
Feb 1 22:22:37 taxco sshd[27932]: error: no more sessions
Feb 1 22:22:37 taxco sshd[27932]: debug1: session open failed, free channel 10
Feb 1 22:22:37 taxco sshd[27932]: debug1: channel 10: free: server-session,
nchannels 11
Feb 1 22:22:37 taxco sshd[27932]: debug1: server_input_channel_open: failure
session
Obviously, Zenoss (or, rather, Twisted) runs each command in its own ssh
session over the same ssh connection. Usually, ssh servers limit the number of
concurrent sessions. This limit seems to be hardcoded (but not identical on all
systems).
Is there a way to limit the number of sessions used by Zenoss?
Thanks for any pointers,
Ross
-------------------- m2f --------------------
Read this topic online here:
http://forums.zenoss.com/viewtopic.php?p=30760#30760
-------------------- m2f --------------------
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