Set multi_accept off
And the web service did not hang this time
https://i.imgur.com/irbA5MO.png
But the connections in CLOSE_WAIT and LAST_ACK got a spike
Posted at Nginx Forum:
https://forum.nginx.org/read.php?2,282613,282675#msg-282675
___
nginx m
Its a shared server and I am unable to modify the domains CloudFlare/DNS
settings.
As said the question mostly is why Nginx is freezing for the same setup and
traffic while Apache handles it just fine.
If its an issue with the Nginx setting, what should I change? or is it a bug
in Nginx?
Nginx
The TCP state graph for the situation is:
https://i.imgur.com/USECPtc.png
You can see at 16:55 the FIN_WAIT1 ,CLOSE_WAIT and ESTABLISHED takes a steep
climb, At this point Nginx hangs as the server has a script that checks stub
status and this doesn't finish. The server itself and all other servi
The domain is proxied over cloudflare and the access log shows a large
number of requests to the website from the cloudflare servers
121115 162.158.88.4
121472 162.158.89.99
121697 162.158.90.176
122265 162.158.91.97
122969 162.158.93.113
125020 162.158.91.103
126132 162.158.90.194
128913
Can multi_accept be on cause this?
I have now set multi_accep to off and set up the Nginx again as a reverse
proxy. The attack is not ongoing now, so can't tell immediately if that
setting helps/not
Posted at Nginx Forum:
https://forum.nginx.org/read.php?2,282613,282646#msg-282646
_
My Current settings are higher except the worker_process
worker_processes 1;
worker_rlimit_nofile 69152;
worker_shutdown_timeout 10s;
thread_pool iopool threads=32 max_queue=65536;
I think the issue is that nginx accumulate ESTABLISHED and CLOSE_WAIT and
FIN_WAIT1
>From successive netstat -apn
I have more info on the system state at the time the CLOSE_WAIT connections
went sky rocketing
Memory
###
KiB Mem : 13174569+total, 8684164 free, 28138264 used, 94923264 buff/cache
KiB Swap: 4194300 total, 4194300 free,0 used. 86984112 avail Mem
