topic Python script triggered by UPM doesn't work properly in ExtremeSwitching (EXOS/Switch Engine)

Python script triggered by UPM doesn't work properly

eyeV — Fri, 06 Nov 2015 20:22:00 GMT

Hi everybody.
I use x480 with 16.1.2.

I have simple .py script like this.
import pexpect
import exsh
exsh.clicmd ('create log message "Starting NSCBackup!"')
for i in range(1,10):
print(i)
p = pexpect.spawn('/exos/bin/ssh -r 2 USERNAME@172.20.1.' + str(i))
idx = p.expect(['password', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('SECRETPASS')
idx = p.expect(['sCore', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('create log message "Not so cold backuper"')
idx = p.expect(['sCore', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('save')
idx = p.expect(['(y/N)', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('y')
idx = p.expect(['sCore', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('scp2 vr "VR-Default" sCore' + str(i) + '.cfg USERNAME@172.20.1.10:sCore' + str(i) + '.cfg')
idx = p.expect(['password', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('SECRETPASS')
p.sendline('exit')Not so beautiful, but it works!

So... I can run it with "load script NSCB.py". It works properly.

Then I created and scheduled UPM profile like this.
create upm profile NSCB
load script NSCB.py
.
create upm timer NSCBtimer
configure upm timer NSCBtimer profile NSCB
configure upm timer NSCBtimer at 11 5 2015 23 50 0 every 86400And I run it:
run upm profile "NSCB" I see some log messages, but script stucked.
11/06/2015 15:55:19.94 Starting NSCBackup!
11/06/2015 15:55:19.54 Launched profile NSCB for the event user-request

Any suggestions?

RE: Python script triggered by UPM doesn't work properly

OscarK — Fri, 06 Nov 2015 20:41:00 GMT

You do a print, but in upm I dont know what happens to that print, does it work if you remove that print(i) ?

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 06 Nov 2015 20:41:00 GMT

Unfortunately no.

RE: Python script triggered by UPM doesn't work properly

OscarK — Fri, 06 Nov 2015 20:41:00 GMT

ok, I think you should add some checks where you send some info to the log to keep track where it is stuck.

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 06 Nov 2015 20:41:00 GMT

Yeah, I'm doing it right now. )

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 06 Nov 2015 20:41:00 GMT

It stucked right after for loop begins.
for i in range(1,10):

RE: Python script triggered by UPM doesn't work properly

OscarK — Fri, 06 Nov 2015 20:41:00 GMT

Maybe it is a rights thing and is ssh not executable by a script launched by UPM.

RE: Python script triggered by UPM doesn't work properly

Matthew_Helm — Sat, 07 Nov 2015 01:14:00 GMT

So it looks like the purpose of this is to have a core switch ssh into downstream connected switches and save their configurations periodically right?

I'll take your script and attempt to make it into a python EXOS application process instead. I'll then test having a UPM process restart the py process. I'll let you know how it works out.

Let me know if I've misinterpreted what you want to do.

Thanks.

RE: Python script triggered by UPM doesn't work properly

eyeV — Sat, 07 Nov 2015 01:14:00 GMT

Yes, the concept is right.

RE: Python script triggered by UPM doesn't work properly

Matthew_Helm — Sat, 07 Nov 2015 03:17:00 GMT

I was able to create a test.py application/process that uses pexpect with /exos/bin/ssh similarly to your script and I used a UPM profile and timer to restart it every 5 minutes. It worked.

Here is the UPM configuration:

## Module upm configuration.
#
create upm profile test
disable cli prompt
restart process test

.
create upm timer test
configure upm timer test profile test
configure upm timer test after 1 every 300

...

And here is the py file for the process and the command to create it. (I assumed that the ssh targets were sub-tended EXOS switches and so I sent the "disable cli prompting" command to avoid unnecessary pexpect lines in the process script.)

#vi test.py

import pexpectimport exos.api
def exosCmd(cmd):
reply = exos.api.exec_cli([str(cmd)], ignore_errors=True)
return str(reply)

def logMsg(m):
exosCmd('create log message "{0}"'.format(m))

logMsg("Starting NSCBackup!")
p = pexpect.spawn('/exos/bin/ssh -r 2 admin@10.0.0.202')
idx = p.expect(['password', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('admin')
idx = p.expect(['x202', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('create log message "test test test"')
idx = p.expect(['x202', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('disable cli prompt')
idx = p.expect(['x202', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('save')
idx = p.expect(['x202', pexpect.EOF, pexpect.TIMEOUT])
p.sendline('exit')

#^wq!
...

The process was started with this line that I issued before starting the UPM timer:

create process test py test start auto

...

Hope this helps.

RE: Python script triggered by UPM doesn't work properly

eyeV — Sat, 07 Nov 2015 03:17:00 GMT

Thank you for advice! I'm going to create similar proccess and give you feedback as soon as possible.

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 13 Nov 2015 12:25:00 GMT

Sorry for waiting... Something is going wrong.

I've created py script, but when I run it I have this.
Traceback (most recent call last):
File "/config/NSCB.py", line 2, in
import exos.api
File "/exos/tools/lib/python2.7/site-packages/exos/api/__init__.py", line 21, in
File "/exos/tools/lib/python2.7/site-packages/exos/api/ems.py", line 10, in
ImportError: No module named _exos_ext_ems
I've tried to import XOS api with "from exos import api" but...
Traceback (most recent call last):
File "/config/NSCB.py", line 2, in
from xos import api
ImportError: No module named xos
It's not clear for me... What am I doing wrong?

RE: Python script triggered by UPM doesn't work properly

Stephane_Grosj1 — Fri, 13 Nov 2015 17:10:00 GMT

You need to run EXOS 15.7 minimum in order to create Python App (process). Are you running 15.6 ?

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 13 Nov 2015 17:10:00 GMT

I'm running 16.1.2.14.

RE: Python script triggered by UPM doesn't work properly

Stephane_Grosj1 — Fri, 13 Nov 2015 17:10:00 GMT

oh, I misread, sorry.

Try that :

from exos import api

instead of

from xos import api

RE: Python script triggered by UPM doesn't work properly

eyeV — Fri, 13 Nov 2015 17:10:00 GMT

Same result...

Traceback (most recent call last):
File "/config/NSCB.py", line 2, in
from exos import api
File "/exos/tools/lib/python2.7/site-packages/exos/api/__init__.py", line 21, in
File "/exos/tools/lib/python2.7/site-packages/exos/api/ems.py", line 10, in
ImportError: No module named _exos_ext_ems

What XOS version do you run?

RE: Python script triggered by UPM doesn't work properly

eyeV — Tue, 17 Nov 2015 15:31:00 GMT

It's not the version problem. I've tried 16.1.1.4, same result. The script doesn't run with upm profile.

create upm profile NSCB
run script NSCB-old.py

run upm profile "NSCB"
11/17/2015 11:26:53.88 Starting NSCBackup!
11/17/2015 11:26:53.44 Launched profile NSCB for the event user-request
I can't even execute single-line script "from exos import api". You can see traceback in previous post.

RE: Python script triggered by UPM doesn't work properly

eyeV — Tue, 17 Nov 2015 20:40:00 GMT

Yeah! I've fixed it! Thanks everybody!

RE: Python script triggered by UPM doesn't work properly

Drew_C — Tue, 17 Nov 2015 20:40:00 GMT

What was the problem? 🙂

RE: Python script triggered by UPM doesn't work properly

eyeV — Tue, 17 Nov 2015 20:40:00 GMT

It was interesting. I've learned that there are two python environments in EXOS actually. This thread. So I can't execute "import exos.api" just by typing "run script blalbalba.py", but I can do it when I create process with this .py script. It's a bit confusing.

Moreover the "from exos import api" string doesn't work at all.

Sorry for my poor English )