UserParameter script returnig empty string

[markfree]

I'm trying to execute a script using UserParameters but Zabbix server is receiving an empty string.


Zabbix Server 4.4.4 in CentOS 7
Host Windows 2012

UserParameter=log_dcsp_urs_p,powershell -ExecutionPolicy bypass -Command (Get-Item E:\DIR\PATH).LastWriteTime.ToString('dd-MM-yyyy HH:mm:ss')

When I try to execute the custom key using Zabbix_Get, it also receives an empty string.

$ zabbix_get -s 172.24.168.24 -k log_dcsp_urs_p

But, when I test the item within the server itself using the zabbix agent, it shows me the expected result.

C:\zabbix\bin>zabbix_agentd.exe -c C:\zabbix\conf\zabbix_agentd.conf -t log_dcsp_urs_p
log_dcsp_urs_p [t|17-06-2021 10:34:22]

There is no error message related to this key in the agent's log neither in the server's log.
And I can't seem to find the root cause for this behavior.

Any ideas?
Thanks

[markfree]

Sorry, I forgot to mention the Server version and host OS information. Edited the post above.

It seems the issue is in between the host and zabbix server.
But I still haven't found it yet.

[markfree]

I'm returning to this issue only now. It is still happening occasionally..
I've captured Zabbix Agent log and it reports an empty string as well.

9304:20211124:090825.833 Requested [log_dcsp_urs_p]
9304:20211124:090825.872 EXECUTE_STR() command:'powershell -ExecutionPolicy bypass -Command (Get-Item E:\DIR\PATH).LastWriteTim e.ToString('dd-MM-yyyy HH:mm:ss')' len:0 cmd_result:''
9304:20211124:090825.873 Sending back []

I've also tried changing the item's key to "system.run", but the outcome is the same.

system.run[powershell -ExecutionPolicy bypass -Command "(Get-Item E:\DIR\PATH).LastWriteTim e.ToString('dd-MM-yyyy HH:mm:ss')"]

[tim.mooney]

How long does this command typically take to run? Is it possible it's exceeding the agent item timeout?

[markfree]

How long does this command typically take to run? Is it possible it's exceeding the agent item timeout?

It runs almost instantly. It's very fast.

[splitek]

[SIZE=16px][FONT=Arial]I'm returning to this issue only now. It is still happening occasionally..

"occasionally" - so I think it may be something related to powershell.
I suggest you to put this command in "ps1" file and run this file from userparameter, like:

system.run[C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Bypass -file C:\path_to_script\some.ps1]

Also add logging what is returned from command to some log file.
Maybe this way you will find where is a problem.

[markfree]

"occasionally" - so I think it may be something related to powershell.
I suggest you to put this command in "ps1" file and run this file from userparameter, like:

system.run[C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Bypass -file C:\path_to_script\some.ps1]

Also add logging what is returned from command to some log file.
Maybe this way you will find where is a problem.

It seems like a PS issue but it only occurs with Zabbix server.
If I execute it directly from cli, it always outputs the correct result.
Anyhow, I'll follow your suggestion and place that PS command whitin a script.

[cyber]

Tried to replicate... Same userparameter (just different directory/file).. No issues whatsoever. Getting values with test, with zabbix_get and also by normal polling..

[cyber]

My test was with 4.4.10 and 2012R2...