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Re: [Fab-user] SSHException with Ubuntu 9.04

From: Ted Carroll
Subject: Re: [Fab-user] SSHException with Ubuntu 9.04
Date: Fri, 14 Aug 2009 16:24:24 -0700
I had a chance to confirm this. paramiko 1.7.5 is broken and paramiko 1.7.4 works. 

Thanks,

Ted C.
On Aug 14, 2009, at 9:06 AM, Wes Winham wrote:


We had this same issue and we narrowed it down to paramiko 1.7.5
We were getting exceptions like:


Traceback (most recent call last):
File "/home/christian/.virtualenvs/pstat_dev/src/fabric/fabric/ main.py", line 454, in main 

   commands[name](*args, **kwargs)
File "/home/christian/work_devel/policystat/pstat/pstat_deploy/ configure.py", line 201, in deploy 

   _push_source()
File "/home/christian/work_devel/policystat/pstat/pstat_deploy/ utils.py", line 117, in _push_source
run('ln -s /var/www/%(pstat_url)s_%(timestamp)s /var/www/% (pstat_url)s' % env)
File "/home/christian/.virtualenvs/pstat_dev/src/fabric/fabric/ network.py", line 371, in host_prompting_wrapper 

   return func(*args, **kwargs)
File "/home/christian/.virtualenvs/pstat_dev/src/fabric/fabric/ operations.py", line 413, in run 

   channel.exec_command(real_command)
File "/home/christian/.virtualenvs/pstat_dev/lib/python2.5/site- packages/paramiko/channel.py", line 212, in exec_command 

   self._wait_for_event()
File "/home/christian/.virtualenvs/pstat_dev/lib/python2.5/site- packages/paramiko/channel.py", line 1077, in _wait_for_event 

   raise e

paramiko.SSHException: Channel closed.



They would occur absolutely randomly (usually between the 5th and 25th
run() or sudo() call for some reason), but I always got that exception
before the script finished (a successful run has about 60 sudo/run
calls). This only started happening after I upgraded from paramiko
1.7.4 installed via the python-paramiko package on Ubuntu 9.04 to
paramiko 1.7.5 installed via pip in my virtualenv. I had also upgraded
from fabric 0.9a3 to 0.9b1 at the same time, but I was able to narrow
it down to the paramiko change by going back to 0.9a with the problem
continuing.

The annoying part is that 1.7.4 isn't hosted anywhere on pypi, so
we're having to go back to paramiko 1.7.2. Good news is that
everything is working again at least.

Hope this helps.
-Wes


Offhand that doesn't look like a config issue, especially if it's
intermittent. Are you saying that sometimes that exact command below
will work, or does it always bail out? What other commands have you
successfully run with run() or sudo(), and what other commands have
died -- or is it truly random?
What version of Fabric are you using, a git clone or 0.9b1 or what? :) 

What version of Paramiko do you have installed? IIRC some older
versions of Paramiko can cause problems, you'll want 1.7.4 or newer.
(In fact, 1.7.5 came out recently, and looks like it may fix those
Python 2.6 warnings, hooray!)
Finally, it looks like you're using Python 2.6 on...OS X 10.3 Panther? 
Is that accurate or is your egg path leading me astray? Don't know of
any specific issues on 10.3, just want to make sure I know what your
platform is for the record.

Sorry for the interrogation but that's tech support for you :)

Best,
Jeff
On Sat, Aug 8, 2009 at 7:27 PM, Ted Carroll<address@hidden> wrote:
I'm trying out fabric for the first time so this is probably a silly config problem on my part, but I'm running ubuntu 9.04 in a vmware vm and having a lot of problems getting SSHExceptions. Here's a fabfile that reproduces the 
problem:

from fabric.api import *

def production():
   env.hosts = ['192.168.1.228']
   env.user = 'deployment'
   env.password = 'password'

def test_sudo():
   require('hosts', provided_by=[production])
   put('apache-website-config', 'apache-website-config')
   sudo('rm -f apache-website-config')
   sudo('rm -f bad_file_name2')

The output is:
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/ site-packages/Crypto/Hash/SHA.py:6: DeprecationWarning: the sha module is deprecated; use the hashlib module 
instead
 from sha import *
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/ site-packages/Crypto/Hash/MD5.py:6: DeprecationWarning: the md5 module is deprecated; use hashlib instead 
 from md5 import *
[192.168.1.228] put: apache-website-config -> apache-website-config
[192.168.1.228] sudo: rm -f apache-website-config
Traceback (most recent call last):
File "build/bdist.macosx-10.3-i386/egg/fabric/main.py", line 481, in main 
 File "/Users/tedc/project_46062/deployment/fabfile.py", line 11, in
test_sudo
   sudo('rm -f apache-website-config')
File "build/bdist.macosx-10.3-i386/egg/fabric/network.py", line 369, in 
host_prompting_wrapper
File "build/bdist.macosx-10.3-i386/egg/fabric/operations.py", line 517, in 
sudo
File "build/bdist.macosx-10.3-i386/egg/paramiko/channel.py", line 212, in 
exec_command
File "build/bdist.macosx-10.3-i386/egg/paramiko/channel.py", line 1077, in 
_wait_for_event
paramiko.SSHException: Channel closed.
Disconnecting from 192.168.1.228... done.
It seams to be intermittent -- occasionally it will work but mostly it 
fails.

Any ideas?

Thanks,

Ted C


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End of Fab-user Digest, Vol 19, Issue 7
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--

Wes Winham

m. 405.206.4913

w. 317.844.6885 x139


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