Define service discovery

The discovery servers provide an infrastructure for Platform Common Services to find and communicate with one another, either on the same local node or on a remote node. Multi-Galaxy communication uses three tiers of discovery servers. Note that only two of the tiers are configurable.

• Local Discovery Server (not configurable)

  The Local Discovery Server provides discovery for a single, local node. All services register with the Local Discovery Server, and all clients query it.

• Local Galaxy Server (user configurable)

  The scope of the Local Galaxy server encompasses the services in an entire galaxy. You can designate primary and secondary servers running on different nodes for redundancy.

  At least one Local Galaxy server must be configured and online to enable multi-galaxy communication.

• Multi-Galaxy Server (user configurable)

  The Multi-Galaxy Server encompasses the services available across multiple galaxies. You can designate primary and secondary servers running on different nodes for redundancy. In any multi-galaxy environment, there can be only one designated primary and one designated secondary Cross Galaxy Server.

  The Multi-Galaxy server can reside on any node in the multi-galaxy environment, but all galaxies in the environment must configure the Multi-Galaxy server to run on the same node.