Too many connections in waiting state

[Anoop Alias]

Hi,

I see sometimes too many waiting connections on nginx .

This often gets cleared on a restart , but otherwise pileup

###################
Active connections: 4930


server accepts handled requests


 442071 442071 584163


Reading: 2 Writing: 539 Waiting: 4420


#######################
[root at web1 ~]# grep keep /etc/nginx/conf.d/http_settings_custom.conf
keepalive_timeout               10s;
keepalive_requests              200;
keepalive_disable               msie6 safari;
########################

[root at web1 ~]# nginx -V
nginx version: nginx/1.13.3
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
built with LibreSSL 2.5.5
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
--modules-path=/etc/nginx/modules --with-pcre=./pcre-8.41 --with-pcre-jit
--with-zlib=./zlib-1.2.11 --with-openssl=./libressl-2.5.5
--conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error_log
--http-log-path=/var/log/nginx/access_log --pid-path=/var/run/nginx.pid
--lock-path=/var/run/nginx.lock
--http-client-body-temp-path=/var/cache/nginx/client_temp
--http-proxy-temp-path=/var/cache/nginx/proxy_temp
--http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp
--http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp
--http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nobody
--group=nobody --with-http_ssl_module --with-http_realip_module
--with-http_addition_module --with-http_sub_module --with-http_dav_module
--with-http_flv_module --with-http_mp4_module --with-http_gunzip_module
--with-http_gzip_static_module --with-http_random_index_module
--with-http_secure_link_module --with-http_stub_status_module
--with-http_auth_request_module --add-dynamic-module=naxsi-http2/naxsi_src
--with-file-aio --with-threads --with-stream --with-stream_ssl_module
--with-http_slice_module --with-compat --with-http_v2_module
--with-http_geoip_module=dynamic
--add-dynamic-module=ngx_pagespeed-1.12.34.2-stable
--add-dynamic-module=/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.1.8/src/nginx_module
--add-dynamic-module=ngx_brotli --add-dynamic-module=echo-nginx-module-0.60
--add-dynamic-module=headers-more-nginx-module-0.32
--add-dynamic-module=ngx_http_redis-0.3.8
--add-dynamic-module=redis2-nginx-module
--add-dynamic-module=srcache-nginx-module-0.31
--add-dynamic-module=ngx_devel_kit-0.3.0
--add-dynamic-module=set-misc-nginx-module-0.31
--add-dynamic-module=testcookie-nginx-module
--add-dynamic-module=ModSecurity-nginx --with-cc-opt='-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic'
--with-ld-opt=-Wl,-E
#######################


What could be causing this? The server is quite capable and this happens
only rarely


-- 
*Anoop P Alias*
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