Cluster overview

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All the incoming Internet requests are directed to the Master node server. All public IP-addresses are bound to this server. The server hosts all the services that do not cause overload such as SSH, FTP, DNS, mail services, Cron, ISPmanager. Oproxy in the HTTP traffic caching mode is running there as well. It outputs static files (if customized) and directs all dynamic requests to HTTP node 1 .. NTTP node N.

Several Apache web-servers are running on each HTTP node N node. All of them have a Storage accessible from NFS. Optionally you can run the oProxy processes in the MySQL-traffic caching mode. It can be useful if you don not want your clients to customize scripts for running a remote MySQL server (i.e. for running not via the UNIX-socket, but IP). oProxy in the MySQL caching mode counts load and traffic to MySQL server and provides load balancing and failing-over if several MySQL servers are set to a master⇔master replication mode.

1GBit Ethernet or Fiberchannel for Private network is required for communication between the cluster nodes.

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