UKC 
Your new Centos 6.x server will quickly build up logs and the php.ini log is one that can get huge. If you only want to see real errors then you need no more than the following setting in your php.ini.
Edit your current PHP.INI
nano /etc/php.ini
Replace the error_reporting setting as follows
error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR
In the even that you require a less strict log level, you can change the entry when required, debug your session then promptly change it back.
With Plesk 12 you can create a “preset” which limits the type of scripting that can be assigned by your clients. This can help with the problem where you do not allow Perl or CGI but your Reseller clients can create service plans that allow these restricted services.
To prevent this from occurring, you can create presets which will not allow your clients to override these scripting options.
The file you need to edit
nano /usr/local/psa/admin/conf/site_isolation_settings.ini
In general, your PHP will always be switched on. Your PHP should be handled by FastCGI (for performance and security). Set Perl and CGI to “off” as follows
; The section describes allowed hosting options [hosting] php = on php_handler_type = fastcgi python = off perl = off cgi = off; ;fastcgi = any ;miva = off ;ssi = any ;ssl = any ;shell = /usr/local/psa/bin/chrootsh ;asp = any ;php_safe_mode = off coldfusion = off
You can easily restore the original configuration files whenever required
cp /usr/local/psa/admin/conf/site_isolation_settings.ini.default /usr/local/psa/admin/conf/site_isolation_settings.ini
As a Plesk 12 admin, you can override these settings for any subscription. This simply eliminates these scripting options from showing as options to your clients.
With each new Centos based Plesk server, one of the first things you might want to do is remove the dr-web services. This is easily achieved.
yum remove drweb-base drweb-bases drweb-common drweb-daemon drweb-updater psa-drweb-configurator
Should you need to reinstall the server, you can do so in the Plesk autoinstaller or update manager in the main panel.
Enabling graceful restarts in Plesk 12 will reduce the apache service downtime for your clients. By default, graceful restarts are not enabled.
Let’s log into the psa database
mysql -u admin -p`cat /etc/psa/.psa.shadow` psa
Verify if “graceful restarts” is already enabled
select * FROM misc WHERE param = "restart_apache_gracefully";
If no values are returned then let’s go ahead and make it so
INSERT INTO misc VALUES ('restart_apache_gracefully', 'true');
Now let’s reconfigure all the apache domain configurations, it can take a couple of minutes.
/usr/local/psa/admin/bin/httpdmng --reconfigure-all
You will now find your apache service outage time is drastically reduced.
Whether your are looking for support on an existing domain name, or just looking to make sure the features you require are included before your register your new domain name, you will find answers to the most common questions in this F.A.Q.