Check value using Zabbix Agent

[MarcoUK]

I have configured on my server this zabbix-agent parameter:

cat /etc/zabbix/zabbix_agentd.conf.d/userparameter.conf
UserParameter=verify-download.failures, /usr/share/monitoring/bin/verify.sh /usr/share/monitoring/FILES/download-status

where:

#!/bin/sh
# run from Zabbix agent, used to verify output status
echo $(cat "$1")

and

cat /usr/share/monitoring/FILES/download-status
1

From another script I write this value, where 1 is error the file is not downloaded, and 0 is OK the file is downloaded

On my Zabbix server, I created this item:

Name: download verify
Type: Zabbix agent
Key: verify-download.failures

and if I click on test I receive the correct result (I tried to change manually the value in the file /usr/share/monitoring/FILES/download-status and read correctly the values)

Now I'm trying to create trigger alert, and I set in this way:

Name: download alert
Severity: High
Expression: {server01.mydomain.com:verify-download.failures.last()} = 0

but when the value in /usr/share/monitoring/FILES/download-status is 1 from this trigger I receive always 0

Where is I wrong?

[MarcoUK]

Why do you have Userparameter for this at all? Why not use "vfs.file.contents" item? or "vfs.file.regmatch" etc...

You trigger condition says to trigger when 0, whats the problem?

Thanks for your reply, if I set 0 it works correctly.


To be honest my scope is to check every 5 minutes if the file is wonloaded from S3, and the file if it's downloaded have this name: filename.txt-HH:MM-BST
is there a easy way to check it?

[MarcoUK]

nope... there is no options to enter hours/minutes into filenames... So you are going in right direction with a script checking it and writing result into logfile. but you don't need a UserParameter to read that logfile...
You could also use a trapper item and send value directly from checking script with zabbix_sender

Set your expression to "...= 1" and it should trigger when you receive 1 as item value...

Thanks for your reply.
I created a script that use a zabbix_sender to send info to tripper.
My script is:

# $1 is a parameter passed by argument when I call this script, in my test is TEST1
....
FILE=/opt/folder/file.txt

if [[ -e ${FILE} ]]; then
    result="OK: File exist"
else
    result="Error Download: no file exist"
fi

zabbix_sender -c /etc/zabbix/zabbix_agentd.conf -k $1_download.failures.trapper -o "$result"

This is my tripper:

Name: File verify trapper
Type: Zabbix trapper
Key: TEST1_download.failures.trapper
Type of information: Text

This is my trigger:

Name: File download error
Expression: {server.mydomain.com:TEST1_download.failures.trappe r.regexp("^(Error Download)")}=1

and this is the response if I run manually the zabbix_sender:

zabbix_sender -vv -c /etc/zabbix/zabbix_agentd.conf -k TEST1_download.failures.trapper -o "Error Download: no file exist"
zabbix_sender [747852]: DEBUG: answer [{"response":"success","info":"processed: 1; failed: 0; total: 1; seconds spent: 0.000072"}]
Response from "10.234.16.23:10051": "processed: 1; failed: 0; total: 1; seconds spent: 0.000072"
sent: 1; skipped: 0; total: 1

But I don't receive an alert on trigger.

[cyber]

Why do you have Userparameter for this at all? Why not use "vfs.file.contents" item? or "vfs.file.regmatch" etc...
You trigger condition says to trigger when 0, whats the problem?...

[cyber]

nope... there is no options to enter hours/minutes into filenames... So you are going in right direction with a script checking it and writing result into logfile. but you don't need a UserParameter to read that logfile...
You could also use a trapper item and send value directly from checking script with zabbix_sender
Set your expression to "...= 1" and it should trigger when you receive 1 as item value...

[cyber]

Key: TEST1_download.failures.trapper
But in manual run you are usingFILE1_download.failures.trapper
Your trigger expression is OK. I did set up exact same here, your script et al ... works like a charm..
add that -vv option to script and see does it work ok? There must be some little thing somewhere you have missed ..