Hello! On Wed, Jan 19, 2022 at 07:24:20AM -0500, gab wrote:
> # Issue Summary > > * After executing Nginx soft reload with "service nginx reload", nginx is > able to close a lot of connections gracefully, but some connections aren't > closed gracefully and Nginx is sending an RST packet. For these connections, > Nginx didn't send FIN packet, and it didn't send "Connection: Close" header. > The connections are HTTP/1.1 keep alive connections. > > # Expected Behaviour > > * After executing Nginx soft reload, Nginx is gracefully closing all > connections by sending a "Connection: close" header in the response or a FIN > packet. > > # Supporting Data > > I have tcpdump of 5 such connections where nginx didn't close the connection > gracefully after nginx reload. > Here's the tcpdump - > https://drive.google.com/file/d/1UquhmJET9i8ShEizu8453iUKpprutILV/view?usp=sharing > > If we analyse one such connection, we see that nginx didn't send FIN packet > on this connection, refer this image - https://i.imgur.com/zqyLOLc.png > > If we see the response of second last request, we see nginx didn't send > "Connection: close" header either, refer this image - > https://i.imgur.com/P2uu722.png > > In this image I have plotted FIN packets sent by nginx over time - > https://i.imgur.com/5lNAmnk.png > > Nginx was reloaded on 2022-01-12 13:57:44 UTC. > > FIN packet graph (https://i.imgur.com/5lNAmnk.png) shows that Nginx was able > to close a lot of connections gracefully at the time of reload, but it > wasn't able to close the 5 connections. TCP dump of which I've shared above > (https://drive.google.com/file/d/1UquhmJET9i8ShEizu8453iUKpprutILV/view?usp=sharing). You may want to check if the following change improves things: https://mailman.nginx.org/pipermail/nginx-devel/2022-January/014728.html Note though that it is generally the client's responsibility (AWS ELB's) to retry requests in such cases. See the this thread for details: https://mailman.nginx.org/pipermail/nginx-devel/2021-December/014681.html -- Maxim Dounin http://mdounin.ru/ _______________________________________________ nginx mailing list -- nginx@nginx.org To unsubscribe send an email to nginx-le...@nginx.org
