[SOLVED] Logging does not rotate after 10k lines

Troubleshooting
1

Summary

logging does not rotate after 10k lines

Steps to reproduce

Version: 4.6.0
Build Number: 4.6.1
Build Date: Tue Jan 30 22:08:22 UTC 2018
Build Hash: cc82749d4f8c47bce201123aedcd8c564ceffcb8
Build Enterprise Ready: true
DB Version: 4.6.0
Enterprise Edition running with E20 license

config.json reads:

"LogSettings": {
    "EnableConsole": false,
    "ConsoleLevel": "INFO",
    "EnableFile": true,
    "FileLevel": "INFO",
    "FileFormat": "",
    "FileLocation": "/var/log/mattermost",
    "EnableWebhookDebugging": false,
    "EnableDiagnostics": true
},

Docs say, the log file is rotated after 10000 lines:
https://docs.mattermost.com/administration/config-settings.html#output-logs-to-file

Expected behavior

The log file is rotated after 10000 lines, starting a new one.

Observed behavior

There is only one file growing over 10k lines:

14:09 mattermost@mattermost01 [lej]:/var/log/mattermost$ ll
total 5080
drwxr-x---  2 mattermost mattermost    4096 Jan 31 15:43 ./
drwxr-xr-x 14 root       syslog        4096 Feb 12 07:35 ../
-rw-r-----  1 mattermost mattermost 5193115 Feb 15 14:09 mattermost.log

14:09 mattermost@mattermost01 [lej]:/var/log/mattermost$ wc -l mattermost.log 
25796 mattermost.log

There are no errors or other hints, why it doesn’t rotate the log.
Do I miss there anything?

3

Hi @tmu-sprd,

Thanks for your report,

We believe this is a bug so have opened a ticket here to investigate and track.

4

Thank you, @lindy65,

the same applies to Version 4.7.0 and 4.7.1. Initial installed version was 4.5.0 and was patched up through 4.6.0 and 4.6.1.
I’m happy to provide more information, if needed.

5

Thanks for the additional information @tmu-sprd,

I’ve linked this issue to the Jira ticket so the devs can chime in here if there’s any other information they need :slight_smile:

6

Just as follow-up:
MM is rotating logs after ~50k lines.

root@mattermost01 [lej] /var/log/mattermost # l
total 23132
drwxr-x---  2 mattermost mattermost     4096 May 17 10:33 .
drwxr-xr-x 14 root       syslog         4096 May 27 07:35 ..
-rw-r-----  1 mattermost mattermost  1431997 May 28 07:08 mattermost.log
-rw-r-----  1 mattermost mattermost 11645866 May 17 10:33 mattermost.log.1
-rw-r-----  1 mattermost mattermost 10581911 Mar 12 15:36 mattermost.log.2
root@mattermost01 [lej] /var/log/mattermost # wc -l mattermost.log.2 
55269 mattermost.log.2
root@mattermost01 [lej] /var/log/mattermost # wc -l mattermost.log.1
50155 mattermost.log.1

In docs it’s removed, that lines were rotated after 10k: https://github.com/mattermost/docs/commit/f0f68d09580df2af3f4171b5e8f3b1cd0929e4a2

For me, this is solved.
Thank you.

Side note: The log file does not have a time stamp as documented. But that’s a different topic.