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Monitoring trunk status: via ssh return blank

Mauro Viola

October 07, 2017 08:14

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Hello.

My device is a Yeastar S50.

I use Zabbix for my infrastructure: the device not support SNMP and the only solution I have found is this: run an ssh request by executing the command

asterisk -rx 'pjsip list registrations' |grep TRUNKNAME |awk '{ print $3 }'

if I run this on ssh its works perfectly.
if I run via Zabbix its returns a blank string.
if I run another command via Zabbix (ls or ps aux |grep something, ...) I see the expected results, so Zabbix works by having to connect, authenticating and returning what I need.

now, why do I get the asterisk command I get nothing? even without parameters.

 

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15 comments

• 0
  
  Oscar Colka October 09, 2017 05:37

  Try this:

  asterisk -rx 'pjsip list registrations' |grep TRUNKNAME |awk -F" " '{ print $3 }'

  

• 0
  
  Mauro Viola October 09, 2017 05:50

  Thx for the tip but not working.

  If I try to run only asterisk without parameters (and other piped commands), the result still blank... Is not a problem of grep.

  I also tried to explicit the path of asterisk: /ysdisk/ysapps/pbxcenter/bin/asterisk

  Nothing. :(

• 0
  
  Oscar Colka October 09, 2017 06:03

  Mauro,

  If you try enter asterisk -vvvvvvvvvvr and execute the pjsip list registrations

  Can you get any output?

• 0
  
  Oscar Colka October 09, 2017 06:09

  Also, if you try 

  asterisk -rx 'pjsip list registrations'

  in Zabbix, will you get anything?

• 0
  
  Mauro Viola October 09, 2017 07:56

  No, still blank.

  for that I say that running the command without parameters do not get anything. should come out of the help, but in reality nothing goes out.
  it seems that the command is not executed or the output does not follow the usual channels.
  or that there are problems with this command. all standard linux commands run smoothly, this no. or rather, this has no output.
  I also tried to put a sleep before the command. does not work.

• 0
  
  Oscar Colka October 09, 2017 09:00

  I have an idea:

  Try save the

  asterisk -rx 'pjsip list registrations' |grep TRUNKNAME |awk '{ print $3 }'

  output on the PBX into a file first, then in the Zabbix, you can use Linux command to get the status from the file.

  Check if this works.

• 0
  
  Mauro Viola October 09, 2017 11:33

  The filesystem for the user "support" (password iyeastar) is readonly: is not possibile to create a file.

• 0
  
  Mauro Viola October 09, 2017 15:56

  behind your suggestion I did a test using the variables.

  if I try to launch the asterisk command, get it as exit code 127 (command not found).

  if I try to search for the command with an ls -la ls -la /ysdisk/ysapps/pbxcenter/bin/asterisk
  I get an exit code of 1

  if I try to check the path /ysdisk with ls -la and then getting deeper, i arrive at /ysdisk/ysapps/pbxcenter/
  

  and all folders are more or less populated, the last leaf (bin) is empty, and that's why you can not run the asterisk command

  Oscar, do you have any ideas?

• 0
  
  Oscar Colka October 10, 2017 02:05

  Try create files under directory: /ysdisk/support/tmp

  I can create files correctly.

  

• 0
  
  Mauro Viola October 10, 2017 07:38

  Nothing.

  This is the script:

  ls -la /ysdisk/support/bin/asterisk
  /ysdisk/support/bin/asterisk  -rx 'pjsip list registrations'|grep 28879 |awk -F" " '{ print $3 }' >/ysdisk/support/tmp/test.txt
  ls -la /ysdisk/support/tmp/test.txt
  cat /ysdisk/support/tmp/test.txt

  This is the result's output:

  lrwxrwxrwx    1        37 Mar 10  1970 /ysdisk/support/bin/asterisk -> /ysdisk/ysapps/pbxcenter/bin/asterisk
  -rw-r--r--    1         0 Oct 10 09:33 /ysdisk/support/tmp/test.txt

  the result is consistent with all the tests done before:

  1) the output generated by the asterisk command is always empty

  2) the asterisk command is a link but at an unavailable program

  3) if I make a ls -la /ysdisk/ysapps/pbxcenter/bin/asterisk there is nothing (see my post at 17:56)

   

   

   

   

• 0
  
  Oscar Colka October 10, 2017 08:34

  How about run the script under PBX and using only standard Linux command(but not asterisk related commands) to get the status on Zabbix?

• 0
  
  Mauro Viola October 10, 2017 08:58

  willingly, as an alternative to asterisk, what commands should i use to know the state of the trunk?

• 0
  
  Oscar Colka October 10, 2017 09:06

  Sorry, I don't know if there is any alternative way to get status of the trunk. But I believe to get SIP trunk status through asterisk would be the best way as asterisk is the core of the PBX system and it provides the most timely status.

• 0
  
  Mauro Viola October 10, 2017 10:15

  Finally I have resolved!

  the problem is probably tied to how zabbix performs commands via ssh. it seems that in the context, not all sufficient parameters (PATH, etc.) are assigned.
  In fact, asterisk is not launched because it does not find the libysusb_app.so library
  
  To solve this problem, the command that launches via Zabbix is this. Note that finally I call "sh", in this way I eliminate any related issues:

  echo "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/ysdisk/ysapps/pbxcenter/lib" >/tmp/run_ast.sh
  echo "asterisk  -rx 'pjsip list registrations'|grep TRUNKNAME |awk  '{ print \$3 }'" >>/tmp/run_ast.sh
  sh /tmp/run_ast.sh

• 0
  
  Oscar Colka October 11, 2017 01:10

  Cool! Thank you for sharing this with the community.