VPS Performance tuning and scaling

So you've bought a CentOS VPS from us and you find that sometimes you run out of memory and things go wrong. We've got a few tips and tricks for you to help keep your VPS ticking over. Adjusting the number of web based clients your VPS can handle from 1 second to the other.

   1. First you should backup the file with the following command
          cp /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.backup.`date  +%F-%H-%M`

   2. The following command opens httpd.conf
          vi /etc/httpd/conf/httpd.conf (this command requires that you have some knowledge of using vi, the command nano may be easier to use)
      you should see the following section marked "prefork MPM".

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Courtesy : https://support.blacknight.ie