Error appearing in Pihole web interface does not appear in FTL.log

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1

Expected Behaviour:

An error appearing on the Pihole Web interface, to appear in sequence within the FTL.log

Actual Behaviour:

There is no entry with same timestamp in the FTL.log; Note that Web shows local time which is GMT+2

Possibly the error entries have been deleted from the log file. It is unclear to me what triggers this log to purge its contents.

Debug Token: https://tricorder.pi-hole.net/modaWs6m/

FTLlog
FTLlog928×580 313 KB

Pihole errors log
Pihole errors log1286×721 120 KB

2

Pi-hole diagnosis would aggregate information from many sources, not just FTL.log.

That connection error would be in pihole.log.

3

The diagnosis log also only shows one instance of a repeated warning. You may just be seeing the first time it happened.

4

Yeah, I got that. But what triggers the FTL.log being purged. It was less than 12hrs that I checked and the data was gone, whereas other times I reckon it keeps data for days.

5

It's likely not being purged. It's a linux feature called logrotate that archives log files after a configured amount of time in order to not run out of disk space.

If you run ls -la /var/log/pihole you should see a lot of compressed files with the same names. These are the old logs.

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6

The logs rotate per a rotation schedule installed by Pi-hole. Nightly at midnight.

-rw-r----- 1 root root 358 Sep  5  2024 /etc/pihole/logrotate
   /var/log/pihole/pihole.log {
   	su root root
   	daily
   	copytruncate
   	rotate 5
   	compress
   	delaycompress
   	notifempty
   	nomail
   }
   /var/log/pihole/FTL.log {
   	su root root
   	weekly
   	copytruncate
   	rotate 3
   	compress
   	delaycompress
   	notifempty
   	nomail
   }
   /var/log/pihole/webserver.log {
   su root root
   weekly
   copytruncate
   rotate 3
   compress
   delaycompress
   notifempty
   nomail
   }

Your FTL log directory will typically look like this:

ls -lha /var/log/pihole/FTL*
-rw-r----- 1 pihole pihole    0 Mar 13 00:00 /var/log/pihole/FTL.log
-rw-r----- 1 pihole pihole 8.2K Mar 13 00:00 /var/log/pihole/FTL.log.1
-rw-r----- 1 pihole pihole  255 Mar 10 00:00 /var/log/pihole/FTL.log.2.gz
-rw-r----- 1 pihole pihole 1.2K Mar  8 00:00 /var/log/pihole/FTL.log.3.gz
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