On 6/12/19 4:31 AM, Maxim Dounin wrote:
Hello!
Hi! Thanks for responding.
On Mon, Jun 10, 2019 at 03:59:46PM -0400, Vadim Grinshpun via nginx wrote:
After setting up nginx to run, I've noticed that 'lsof' shows all nginx
processes (master + workers) listening on an ephemeral UDP port.
nginx 25142 vgrinshp 4u IPv4 422450236 0t0 UDP
127.0.0.1:33226
nginx 25144 vgrinshp 4u IPv4 422450236 0t0 UDP
127.0.0.1:33226
nginx 25145 vgrinshp 4u IPv4 422450236 0t0 UDP
127.0.0.1:33226
nginx 25146 vgrinshp 4u IPv4 422450236 0t0 UDP
127.0.0.1:33226
nginx 25147 vgrinshp 4u IPv4 422450236 0t0 UDP
127.0.0.1:33226
I did not explicitly configure anything that (AFAIK) uses UDP, and I
could not find anything in the doc that mentions any use of UDP ports by
nginx.
The ports seem to be used by nginx even with the most minimal nginx.conf.
Does anyone here know how/why these ports are used?
By default nginx doesn't use any UDP ports. What's in your
config?
Thanks for confirming this.
I was able to find the culprit on my end (a custom module that uses a
library that, as it turns out, listens on a UDP port for tracing purposes).
-Vadim
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