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FAQ

Answers to a few popular questions about InterWorx-CP

  • Is this a true load balancing solution?
  • Yes, domains are served from every clustered node and the cluster manager acts as the load balancer for the cluster using LVS.
  • How are files synced across the cluster?
  • There is no scheduled synchronization done at all. The system uses a shared NFS storage device on the cluster manager as the main repository for client data.
  • Don’t session based scripts break when used in a cluster?
  • No, sessions are handled by LVS persistence (node affinity) where a given client IP is directed to the same cluster node over a period of time, thus saving the session state. For applications with database-based sessions the persistence is not even needed.
  • What box do my users connect to for mail, ftp etc?
  • This is up to you. Users can connect to any box in the cluster, including the Cluster Manager to use IMAP/POP3/FTP services. Users can also send mail from any box in the cluster. It comes down to a architectural decision you must make as to what IPs to publish to your users for a given service.
  • How does the load balancer work?
  • Load balancer documentation
  • What platforms does the clustering solution run on?
  • At the moment just CentOS 4, but there is no technical reason it can’t be run on every InterWorx-CP supported OS.
  • Does the clustering solution cost more than the base product?
  • No, any non-VPS unlimited domain license can run the clustering solution.
  • Where is the clustering documentation located?
  • Clustering documentation
  • How is DNS handled, is there a master/slave setup between the nodes?
  • InterWorx-CP uses a database back-end to store all DNS data. This means that each node in the cluster, including the Cluster Manager sees the exact same DNS data. You can simply use any of the nodes as a full fledged DNS server for sites in the cluster without having to worry about setting up any master/slave system. It is a truly clustered DNS setup.
  • Does each cluster node require a license?
  • Yes, every node in the cluster requires an unlimited domain InterWorx-CP license.
  • Is this a high-availablity solution?
  • No, not at this time. This functionality is currently being developed.

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