Strange nginx issue

[Geo P.C.]

Thanks Steve for your  update. We are using separate mysql server and in
this innodb_flush_log_at_trx_commit = 1. This site is running money
transactions applications so is it safe to change this option.



Also to this mysql server other servers with default nginx and PHP5-fpm
configuration is connecting it and they don't have such issues. For
optimization we done the above changes and causing this issue.



So can you please help me.




On Mon, Apr 7, 2014 at 8:33 PM, Steve Wilson <lists-nginx at swsystem.co.uk>wrote:

>  I've just done a drupal7 site under nginx+php-fpm on debian.
>
> One thing I noticed was that the php process wasn't closing fast enough,
> this was tracked down to an issue with mysql. Connections were sitting idle
> for a long time which basically exhausted the fpm workers on both the web
> servers.
>
> We have 2 mysql nodes doing replication between them and I think the
> binlog commit was holding this up, adding "innodb_flush_log_at_trx_commit
> = 0" to the my.cnf stopped this problem from occuring.
>
> Page caching is stored in mysql too, moving this to memcached helped
> massively and reduced the daily binlogs from 5G/day down to a few hundred
> meg.
>
> I'm not sure if this is a strange setup but we have nginx terminating ssl
> which proxies to varnish which then has 2 additional nginx nodes serving
> drupal7, these use a 2 node mysql cluster and 2 memcached nodes for caching
> pages etc.
>
> Steve.
>
> On 07/04/2014 15:34, Geo P.C. wrote:
>
>  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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