Best practise to optimize a Plesk server with nginx

Azurel · Feb 3, 2014

Hello,

I have a 32GB RAM QuadCore Root-Server and user/visitors on my websites reports "500/nginx" and "502/nginx" error-code sites from time to time or images want load and after f5 loaded perfectly. All this problems I dont have before (3 years older server without Plesk/Nginx). So I think I have not correctly setting up my server for plesk/nginx? Can anybody help me here for a better setting? Thank you!

MRTG stats

Established TCP Connections
max: 1069
Average: 591
current: 637

Current Processes Running
Max: 229
Average: 204
Current: 212

# top
top - 19:49:38 up 18 days, 17:23, 1 user, load average: 1.09, 0.89, 0.80
Tasks: 225 total, 2 running, 223 sleeping, 0 stopped, 0 zombie
Cpu(s): 8.9%us, 5.2%sy, 0.0%ni, 84.0%id, 1.6%wa, 0.1%hi, 0.3%si, 0.0%st
Mem: 32875680k total, 31226260k used, 1649420k free, 1518552k buffers
Swap: 1023992k total, 85184k used, 938808k free, 24922868k cached

# top
top - 23:24:33 up 19 days, 20:58, 1 user, load average: 0.60, 0.74, 0.78
Tasks: 212 total, 1 running, 211 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.2%us, 2.3%sy, 1.4%ni, 92.4%id, 0.5%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 32875680k total, 32481364k used, 394316k free, 1524636k buffers
Swap: 1023992k total, 92240k used, 931752k free, 26082060k cached

NGINX; /etc/nginx/nginx.conf

keepalive_timeout 65;

"Web Server Settings" for nginx have: "gzip_proxied any;"

====================

APACHE; /etc/httpd/conf

KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 5

<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 512
MaxClients 512
MaxRequestsPerChild 4000
</IfModule>

====================

MYSQL; /etc/my.cnf

I have used mysqltuner.pl to optimize:

Code:

query_cache_size        	= 256M
innodb_buffer_pool_size 	= 256M
key_buffer_size       	= 2048M
join_buffer_size		= 2M
thread_cache_size		= 16
table_open_cache		= 2048
#table_definition_cache	= 2048
low_priority_updates		= 1
slow_query_log		= 1
expire_logs_days		= 7
slow_query_log_file		= /var/log/mysql-slow.log
log_error 			= /var/log/mysql-error.log
#long_query_time  		= 25

[mysqldump]
quick
quote-names
max_allowed_packet		= 32M

[isamchk]
key_buffer_size		= 256M

[myisamchk]
key_buffer_size		= 256M

[mysqld_safe]
log-error			= /var/log/mysql-error.log
pid-file			= /var/run/mysqld/mysqld.pid

Azurel · Feb 4, 2014

The 500/502 error sites comes all time from nginx and nginx error log says thousand of lines with

[crit] 6470#0: accept4() failed (24: Too many open files)

[alert] 6470#0: *10858294 socket() failed (24: Too many open files) while connecting to upstream, client:

[error] 1808#0: *959229 connect() failed (111: Connection refused) while connecting to upstream, client:

[alert] 1808#0: *10343383 socket() failed (24: Too many open files) while connecting to upstream, client:

<html>
<head><title>500 Internal Server Error</title></head>
<body bgcolor="white">
<center><h1>500 Internal Server Error</h1></center>
<hr><center>nginx</center>
</body>
</html>

EDIT:

/etc/nginx/nginx.conf
I have add this line:

# set open fd limit to 30000
worker_rlimit_nofile 30000;

And /var/log/nginx/error.log-xxxxxx stopping writing errors.

Faris Raouf · Feb 4, 2014

You don't mention which version of Plesk you are using.

Have you seen http://kb.parallels.com/en/115139

Also see: http://forum.parallels.com/showthread.php?264267-Plesk-11-0-9-Nginx-Problem

Azurel · Feb 5, 2014

Oh... yes, I use plesk 11.5.30 #31

Thanks for your help.

With my change (see edit) that problem is gone. (so I think/hope)

But now I found a new error and will create a new thread for this: http://forum.parallels.com/showthre...ed-(13-Permission-denied)&p=717329#post717329

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Best practise to optimize a Plesk server with nginx

Azurel

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Azurel

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Faris Raouf

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Azurel

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