Vlad, I'd suggest beginning by seeing whether or not this is real. If you create a cron job that invokes netstat -ant every hour, then summarize the connections and either view them manually or write them into an influxdb and graph with grafana you will see whether or not the #tcp connections really is growing and, if so, which connections are growing.
That would seem like a useful first step. Peter Sent from my iPhone > On Jul 26, 2017, at 6:15 AM, Vlad K. <nginx...@acheronmedia.hr> wrote: > > > Hello list, > > I'm graphing information from the nginx status page, and have noticed > something odd. The "Writing" connections are flat over time, not correlated > to the Active/Reading/Waiting connections and are steadily increasing over > time. Example for the past week: > > https://pasteboard.co/GCHKB3B.png > > Where it drops, is where I've restarted (not reloaded) the service, and > starts growing up after a short while. This server FreeBSD but I've noticed > it also in Debian. > > Is there a way to find out which connections are these, which remote IPs they > are so I can track them with netstat or sockstat? This looks to me like > connection FD or something has been leaking. If this is a bug, I'm not sure > what to report. > > I've also noticed, from time to time, connections lingering for long time in > "CLOSED" state (as reported by netstat), googling for which seems to suggest > a bug in application, where it doesn't release the FD after the remote has > closed. > > > Thanks. > > > -- > Vlad K. > _______________________________________________ > nginx mailing list > nginx@nginx.org > http://mailman.nginx.org/mailman/listinfo/nginx _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
