Strange nginx issue

[Geo P.C.]

We are facing a strange issue on our servers. We have servers with 1GB RAM
and some drupal sites are running on it.



Generally all sites are loading fine but sometimes we are unable to access
any sites. After waiting for 10mts we are getting a 502 gateway timeout
error. In middle when we restart either nginx or php5-fpm it will load.



Our configurations are as follows:



/etc/nginx/nginx.conf:



user www-data;

worker_processes 1;

pid /run/nginx.pid;

worker_rlimit_nofile 400000;



events {

        worker_connections 10000;

        multi_accept on;

        use epoll;

}



http {



        access_log      off;

        sendfile on;

        tcp_nopush on;

        tcp_nodelay on;

        keepalive_timeout 2;

        types_hash_max_size 2048;

        server_tokens off;

        keepalive_requests 100000;

        reset_timedout_connection on;

        port_in_redirect off;

        client_max_body_size 10m;

        proxy_connect_timeout  600s;

        proxy_send_timeout  600s;

        proxy_read_timeout  600s;

        fastcgi_send_timeout 600s;

       fastcgi_read_timeout 600s;

       open_file_cache max=200000 inactive=20s;

       open_file_cache_valid 30s;

       open_file_cache_min_uses 2;

       open_file_cache_errors on;



/etc/php5/fpm/pool.d/www.conf



pm.max_children = 5

pm.start_servers = 2

pm.min_spare_servers = 1

pm.max_spare_servers = 3

;pm.process_idle_timeout = 10s;

;pm.max_requests = 200

request_terminate_timeout = 300s



And please see the added contents in /etc/sysctl.conf



##########################

fs.file-max = 150000

net.core.netdev_max_backlog=32768

net.core.optmem_max=20480

#net.core.rmem_default=65536

#net.core.rmem_max=16777216

net.core.somaxconn=50000

#net.core.wmem_default=65536

#net.core.wmem_max=16777216

net.ipv4.tcp_fin_timeout=120

#net.ipv4.tcp_keepalive_intvl=30

#net.ipv4.tcp_keepalive_probes=3

#net.ipv4.tcp_keepalive_time=120

net.ipv4.tcp_max_orphans=262144

net.ipv4.tcp_max_syn_backlog=524288

net.ipv4.tcp_max_tw_buckets=524288

#net.ipv4.tcp_mem=1048576 1048576 2097152

#net.ipv4.tcp_no_metrics_save=1

net.ipv4.tcp_orphan_retries=0

#net.ipv4.tcp_rmem=4096 16384 16777216

#net.ipv4.tcp_synack_retries=2

net.ipv4.tcp_syncookies=1

#net.ipv4.tcp_syn_retries=2

#net.ipv4.tcp_wmem=4096 32768 16777216

##########################



Can anyone please help us on it.



Thanks


Geo
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