Hello!

On Thu, Sep 26, 2019 at 09:13:20AM -0400, rick_pri wrote:

> We recently noticed this on our servers and we were using USR1 for
> postrotation which wasn't working as expected. We changed the post rotation
> command to be HUP and this fixed the issues of rotation being borked.
>
> http://nginx.org/en/docs/control.html
> It says that USR1 should reopen logfiles after they have been renamed but we
> found that this didn't work

The USR1 is the right way to ask nginx to reopen log files, and it
is enough for log rotation. While using HUP is also possible, it
does full configuration reload, and using it for log rotation is
wrong - for example, this may result in accidental use of a
configuration being edited.

If USR1 does not work for you, most likely it is because log files
after log rotation cannot be opened for writing by worker
processes. Fix is to assing correct access rights to the new
files created during log rotation, and also make sure nginx worker
process are able to access the directory with the log files.

--
Maxim Dounin
http://mdounin.ru/
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