It's not exactly clear what you mean :-)
In case of rsyslog, the killall -HUP (be wary about the killall command
- getting used to it can have disastrous effects if you're on a wrong
system - https://en.wikipedia.org/wiki/Killall ) makes the rsyslogd
process reopen the log files (and re-read _some_ configuration files;
but only very selected subset - in order to apply new configuration you
generally need to restart the rsyslogd completely).
Which means that typically
1. rsyslogd works as usual
2. logrotate wakes up and rotates the files - the log files change their
names (for example - /var/log/messages becomes /var/log/messages.1). But
files are still open - rsyslogd can still write to the descriptors it
opened long ago. The data lands in the same files, it's just that they
are named differently now. So in our example - rsyslog is writing to
/var/log/messages.1.
3. logrotate sends SIGHUP to rsyslogd as part of postrotate action
4. rsyslogd receives SIGHUP, closes its file descriptors and opens new
ones with the filenames specified in configuration (so closes
/var/log/messages.1 and creates /var/log/messages again).
5. optionally - logrotate compresses rotated files
That's how you normally do it.
On 19.01.2022 11:11, Helmut Schneider via rsyslog wrote:
Hi,
is there a rule when to issue a rotate / reload command? I'm referring
to "postrotate" in logrotate.
https://docs.rackspace.com/support/how-to/understanding-logrotate-utility/
Thank you!
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