I want to make a "snapshot" of my old VPS server and create a new installation. The server would be used as Magento testing environment with 10+ test domains. What I would like to know is

  1. Server should have HTTP server + MySql Database. So with MySql server is everything quite clear, but what about HTTP server? I need FAST PHP processing server or for example some union of 2 servers or specific module installation - removal?
  2. What are good options for PHP running speed optimization? Might be some caching tools like APC or eAccelerator?
  3. What are good options for MySql running speed optimization? Caching with sphynx or something like that?
  4. Could DirectADmin be used?
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