Reag logfile from other host - error message

[Seqway]

Dear all,

i have succesfully running Zabbix server.
It is connecting to several clients / agents and i made a new Item where i want to read some logfiles.

Key: log[/var/log/pihole.log,error]
Type: Zabbix agent (active)

The strange thing is that the log file is succesfully red and it is shown in Zabbix but on server side i have the following messages in the log which i can't explain:

zabbix_agentd.log:

8936:20220105:092312.570 active check "log[/var/log/pihole.log,error]" is not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8937:20220105:092313.589 active check "log[/var/log/pihole.log,error]" is not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8936:20220105:092612.610 active check "log[/var/log/pihole.log,error]" is not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8937:20220105:092613.633 active check "log[/var/log/pihole.log,error]" is not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory

zabbix_server.log

8961:20220105:092240.128 item "Zabbix:log[/var/log/pihole.log,error]" became supported
8962:20220105:092312.821 item "Zabbix:log[/var/log/pihole.log,error]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8962:20220105:092339.833 item "Zabbix:log[/var/log/pihole.log,error]" became supported
8962:20220105:092505.460 item "Zabbix:log[/var/log/pihole.log,error]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8964:20220105:092540.597 item "Zabbix:log[/var/log/pihole.log,error]" became supported
8963:20220105:092547.633 item "Zabbix:log[/var/log/syslog,,,,,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
8962:20220105:092552.654 item "Zabbix:log[/var/log/syslog,error]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
8962:20220105:092552.654 item "Zabbix:log[/var/log/pihole.log,error]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
8962:20220105:092605.693 item "Zabbix:log[/var/log/syslog,,,,,skip]" became supported
8962:20220105:092610.181 item "Zabbix:log[/var/log/syslog,error]" became supported
8962:20220105:092640.489 item "Zabbix:log[/var/log/pihole.log,error]" became supported

As i said, under History i see the pihole log file without any problems.

What does this mean ?

[cyber]

Just throwing things in the air here...
Is that log being rotated/overwritten? What happens if you use logrt instead of log?
Seems you have issues with syslog also, Permissions coming and going...
Probably should mention hosts platform also, maybe someone has some ideas.

[Seqway]

It was indeed a permission problem.
I needed to check from where this message is coming and going and which Template it is related to.
Also i needed to set the requestes file with CHOWN readable permissions to zabbix.

[Seqway]

I Have to revise my statement.
Again i have problems to read the syslog file. Here comes the message - where do i have to look to solve the problem:

428:20220108:203254.206 item "Zabbix:log[/var/log/syslog]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
426:20220108:203255.105 item "Zabbix:log[/var/log/syslog]" became supported

The file has read permissions for user.group = zabbix.root

[Seqway]

Now i am totally confused !

My logs from pihole Server are coming pretty fine under History. It is pihole.log and syslog from the system

BUT on my Zabbix server i looked into the server.log and here i have every pollinh the same error messages. Please help whats wrong here ?
Is it a timeout or why do i have these messages ? Once again the files are red fine in zabbix:

428:20220110:122428.008 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
432:20220110:122442.353 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
428:20220110:122515.870 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:122542.266 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
435:20220110:122615.688 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:122631.640 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
433:20220110:122642.408 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
432:20220110:122727.076 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
435:20220110:122802.717 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
435:20220110:122815.728 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:122828.803 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
432:20220110:122831.697 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
433:20220110:122915.971 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:122942.381 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
428:20220110:123016.521 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
432:20220110:123027.599 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
435:20220110:123031.735 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
433:20220110:123042.677 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
428:20220110:123115.857 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
435:20220110:123127.845 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
433:20220110:123203.119 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
432:20220110:123216.163 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
435:20220110:123229.234 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
435:20220110:123232.250 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
428:20220110:123316.407 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:123327.232 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory
428:20220110:123416.621 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became supported
428:20220110:123431.975 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became not supported: Cannot open file "/var/log/syslog": [13] Permission denied
432:20220110:123442.751 item "Zabbix:log[/var/log/syslog,error,,500,skip]" became supported
432:20220110:123528.121 item "Zabbix:log[/var/log/pihole.log,,,,skip]" became not supported: Cannot obtain information for file "/var/log/pihole.log": [2] No such file or directory