Rotation of logs (logrotate) and releasing the rotated inode log file

[fauust]

Hi!

I have configured mirrorbits as a systemd service like bellow:

[Unit]
Description=Mirrorbits redirector
Documentation=https://github.com/etix/mirrorbits
After=network.target

[Service]
Type=fork
RuntimeDirectory=mirrorbits
User=www-data
PIDFile=/run/mirrorbits/mirrorbits.pid
ExecStart=/usr/local/bin/mirrorbits daemon -p /run/mirrorbits/mirrorbits.pid
ExecReload=/bin/kill -HUP $MAINPID
ExecStop=-/bin/kill -QUIT $MAINPID
KillMode=mixed
Restart=on-failure

[Install]
WantedBy=multi-user.target

The logs are configured like follow:

❯ grep ^LogDir /etc/mirrorbits.conf
LogDir: /var/log/mirrorbits

And finally I have tried the following logrotate conf:

❯ cat /etc/logrotate.d/mirrorbits
/var/log/mirrorbits/*.log {
	daily
	missingok
	rotate 14
	compress
	delaycompress
	notifempty
 	create 0640 www-data adm
	sharedscripts
	postrotate
		/usr/bin/killall -HUP mirrorbits
	endscript
}

My problem is that reloading mirrorbits (with /usr/bin/killall -HUP mirrorbits) is not sufficient to release inode log file and mirrorbits continue to write logs to the rotated file (that was kind of expected as the documentation says that it will only "reload configuration"):

❯ ls -l /var/log/mirrorbits
total 68184
-rw-r----- 1 www-data adm             0 Mar 30 00:00 downloads.log
-rw-r----- 1 www-data adm       2659979 Mar 30 10:02 downloads.log.1
-rw-r----- 1 www-data adm       2854980 Mar 29 11:08 downloads.log.2.gz

If possible I would like to avoid restarting mirrorbits on every log rotation but I am not sure if that's possible.

[wsnipex]

you want "copytruncate"
try this:

/var/log/mirrorbits/*.log {
    notifempty
    missingok
    daily
    dateext
    compress
    copytruncate
    rotate 7
}

[fauust]

Wow thanks, that was easier than I thought, sorry for not RTFM of logrotate, I was blind by the nginx logrotate configuration.
I will close this tomorrow if it works.

[fauust]

This is a valid solution and works with mirrorbits, thanks again @wsnipex!