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Backend Clustering

Back-end clustering procedure is quite simple. It is possible to add a new back-end nodes on-demand. It is supposed that the database node is already moved out on a remote server. In addition, it is required to have a number of clean Parallels Business Automation - Standard installations which will be the next back-end nodes in a cluster plus another one (and only one!) for the front-end server. It is recommended to use original Parallels Business Automation - Standard installation as a future front-end node.

This procedure can be repeated many times:

  1. Log in to the front-end node and start the hspc-cluster.pl tool in the front-end configuration mode (with -f or --frontend flag)
  2. Enter a list of back-end nodes available for the cluster. It is recommended but not required to enter the most recently used (production) management node first.
  3. Select whether you want to set up database access parameters generally or individually for all the back-end nodes. Those settings will be cloned over all the Parallels Business Automation - Standard cluster nodes.
  4. The script will generate (if needed) a SSH DSA public key and set it for every back-end server specified for future access, so the script will prompt for a root password for each of back-end nodes.
  5. Rsync synchronization server will be configured by scheduling synchronization every 15 minutes. In this case, the front-end server will be a primary storage node for data synchronization.
  6. Configuration for every back-end will be done by cloning the script for every node and transparently starting it in an automated or interactive mode (depending on the choice made on step 3).
  7. Front-end node configuration itself starts. This will install a certain number of configuration files and scripts for a load balancing system.
  8. All the new services will be registered and configured. The script will prompt also for a necessary services restart. The following services will be run on the front-end node: Task Manager, Virtuozzo Collector and Power DNS services. The rest will be cloned among the back ends.

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