Tweak I-mscp for high traffic websites.

**Delta04** · Sep 27th 2014

I have some problems with one of our servers that is hosting a high traffic website. To be more exact, from time to time with no reason php5-fm dies and the quick fix is to restart the process.
I wonder what can we tweak to optimize the server for such a big task.

A part of the apache2 error log is,

Code

[Sat Sep 27 13:10:58.013184 2014] [fastcgi:error] [pid 23562:tid 139667001292544] (2)No such file or directory: [client 74.6.254.101:39370] FastCGI: failed to connect to server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld": connect() failed[Sat Sep 27 13:10:58.013245 2014] [fastcgi:error] [pid 23562:tid 139667001292544] [client 74.6.254.101:39370] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld"[Sat Sep 27 13:10:58.048675 2014] [fastcgi:error] [pid 23562:tid 139666883794688] (2)No such file or directory: [client 68.180.225.108:15248] FastCGI: failed to connect to server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld": connect() failed[Sat Sep 27 13:10:58.048726 2014] [fastcgi:error] [pid 23562:tid 139666883794688] [client 68.180.225.108:15248] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld"[Sat Sep 27 13:10:58.079957 2014] [fastcgi:error] [pid 23562:tid 139666808260352] (2)No such file or directory: [client 5.14.222.14:1419] FastCGI: failed to connect to server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld": connect() failed, referer: https://www.google.ro/[Sat Sep 27 13:10:58.080007 2014] [fastcgi:error] [pid 23562:tid 139666808260352] [client 5.14.222.14:1419] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domain.tld", referer: https://www.google.ro/

The configuration is a cloud server with 8vcpu, 16GB RAM, SSD Storage.
Software. Ubuntu 14.04LTS, Apache 2.4.7, PHP 5.5.9, I-mscp 1.1.14
The website is a Wordpress installation. Traffic of the site is around 10.000 -18.000 unique visitors, and I saw a peak on the 480 simultaneous visitors. Most of the time there are ~100 simultaneous visitors.
I use also memcache and local CDN (w3 total cache plugin) to make the website snappy.

PHP Settings for this domain,

Code

post_max_size directive 512MBupload_max_filesize directive 32MBmax_execution_time directive 240 secmax_input_time directive 480 secmemory_limit directive 2046MB

Apache tuning, that I have done in apache2.conf

Code

Timeout 600 (default was 300)MaxKeepAliveRequests 300 (default was 100)

Rest of the apache2 settings are default.

I did some tuning also on /etc/apache2/mods-available/mpm_worker.conf

Code

<IfModule mpm_worker_module>
StartServers 4
MinSpareThreads 50
MaxSpareThreads 150
ThreadLimit 128
ThreadsPerChild 50
MaxRequestWorkers 800
MaxConnectionsPerChild 0
</IfModule>

Any suggestions? Thanks!

**Nuxwin** · Sep 28th 2014

Hello ;

I'll try to give an answer this evening. Sorry for the delay my friend

BTW: I love to see such a thread wich bunch of information. This really help us

**Delta04** · Sep 28th 2014

It's OK. I'm using a dirty hack to "fix" the problem, for the moment. I'm waiting for any reply.

Shell-Script

#!/bin/bash
#Disable debug output
set +x
#Set timezone to Bucharest
export TZ=Europe/Bucharest
url="http://www.domain.tld"
while [ true ]
do
code=`curl -sL -w "%{http_code}\\n" "$url" -o /dev/null`
echo "Found code $code"
if [ "x$code" = "x200" ]
then
echo $(date +"%T") : Site is up.
sleep 10
else
echo $(date +"%T") : Site is down.
echo Restarting PHP...
service php5-fpm restart
if [ $? -eq 0 ]; then
echo Restart succeeded.
else
echo Restart failed.
fi
sleep 10
fi
done

Display More

needforszpit · Oct 3rd 2014

this way of "optimization" is a deadway:)
@ a "bigger" trafic like that:
your server have not enough time to respond:)...
if you open a page on any site hosted on server after a long time(aprox 20-30sec) just simply get an ERROR 500 or not respond...
php5-fpm restart is just a "temporary" solution.
Why i write "temporary"?...because after restart the clients is reconnecting and "failure" is back.
But this thing is NOT a failure just a simply "bad" setting of system.

/*daca vrei, pentru niste bani iti zic ce trebuie sa faci sa nu "moare" serverul*/

**Delta04** · Oct 3rd 2014

Thanks for the answer, there was no problem about the settings, it was a OPcache issue. I disabled it and now works fine. There was no Error 500, php5-fpm process was just dying.
Thread is still open to suggestions on how to improve performance of a i-mscp server for large traffic websites. Who want's to share it to the community, off-cause.

PS: We are on an international area of the forum, please write in English. Needforszpit was suggesting to share the information on private, for some money.

**Nuxwin** · Oct 4th 2014

@Delta04

Seriously? He ask money for sharing its settings???

**Delta04** · Oct 6th 2014

I will translate this from Romanian to English (you can try it too, with Google translate or some other tool).

/*daca vrei, pentru niste bani iti zic ce trebuie sa faci sa nu "moare" serverul*/
/*if you want, for some money I will tell you what to do, so your server will not "die" */

I got no problem with the idea of a paid service, the problem is that he addressed me in my mother language, on an international forum.

Tweak I-mscp for high traffic websites.

Share

Daily visitors