mdounin at mdounin.ru
Tue May 3 04:27:51 MSD 2011
On Mon, May 02, 2011 at 07:00:18PM -0300, Jonathan Leibiusky wrote:
> Hi! How reloading my conf can affect my running nginx instances that are
> under load?
While reloading nginx master process parses new configuration,
starts new worker processes and instructs old worker processes to
gracefully terminate (i.e. finish processing of all requests and
This shouldn't affect anything but may require additional
resources (mostly memory). If you don't have enough memory reload
may be problematic operation, and it's generally good idea to make
sure your running nginx doesn't consume more than half of your
server memory under normal load (to make sure it will be possible
to start additional worker processes on reload).
> Just made a small test and I saw that some requests to the upstream are
> being lost. I am reloading the same configuration I had, didn't change
It's strange you see something being lost. Are you sure you
actually did reload (i.e. sent SIGHUP to nginx master process)?
> Is there any best practice on how to do it? how often? if I should avoid
> something in particular? etc...
General practice is to reload config when you've changed it.
If you are doing reloads often - you may want to make sure
previous reload was completed (i.e. old workers terminated) before
doing another one (there is nothing fatal if it's not, but see
above about resources). Please note that with some use cases
(long-running requests, downloads and so on) reload may take
several hours or even more.
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