nginx stopping abruptly at fix time (2:00 am) repeatedly on Cent OS 7.2

[omkar_jadhav_20]

Hi ,

Please note that we are using nginx v 1.10.2 and on one of our webserver
(centos 7.2) we are observing below error and sudden stopping of nginx
service repeatedly at fix time i.e. at 2:00 am. Below are error lines for
your reference :

2017/02/26 02:00:01 [alert] 57550#57550: *131331605 open socket #97 left in
connection 453
2017/02/26 02:00:01 [alert] 57550#57550: *131334225 open socket #126 left in
connection 510
2017/02/26 02:00:01 [alert] 57550#57550: *131334479 open socket #160 left in
connection 532
2017/02/26 02:00:01 [alert] 57550#57550: *131334797 open socket #121 left in
connection 542
2017/02/26 02:00:01 [alert] 57550#57550: *131334478 open socket #159 left in
connection 552
2017/02/26 02:00:01 [alert] 57550#57550: *131334802 open socket #194 left in
connection 633
2017/02/26 02:00:01 [alert] 57570#57570: aborting
2017/02/26 02:00:01 [alert] 57553#57553: aborting
2017/02/26 02:00:01 [alert] 57539#57539: aborting
2017/02/26 02:00:01 [alert] 57550#57550: aborting

Also find below nginx conf files for your reference :

worker_processes  auto;
events {
 worker_connections  4096;
 use epoll;
 multi_accept on;
}
worker_rlimit_nofile   100001;

http {
 include       mime.types;
 default_type  video/mp4;
 proxy_buffering           on;
 proxy_buffer_size         4096k;
 proxy_buffers             5 4096k;
 sendfile                  on;
 keepalive_timeout         30;
 tcp_nodelay               on;
 tcp_nopush               on;
 reset_timedout_connection on;
 gzip                      off;
 server_tokens          off;
log_format access '$remote_addr $http_x_forwarded_for $host [$time_local] '
'$upstream_cache_status ' '"$request" $status $body_bytes_sent '
'"$http_referer" "$http_user_agent" $request_time'

Also note that we have similar servers with exact same nginx config running
but those servers are not giving any such errors. Also we are not running
any script or cron at this point of time.
Kindly help us to resolve this issue.  Also let me know in case any other
details are required from my end.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,272633,272633#msg-272633