Roles and services in a cluster
The nodes in a cluster share the cluster services, which include the distributed session cache, configuration database, geolocation database, and runtime database.
The ISAM appliance provides services that can be shared across the cluster.
We can configure more than one master appliance to provide failover for some of these services as described in Failover in a cluster.
- Distributed Session Cache
- The distributed session cache is a central cache to hold user session information.
- Configuration database
- The configuration database stores configuration data that includes policy information, which is shared between the appliances in the cluster. We can update configuration data on the primary master only.
- Geolocation database
- The geolocation database provides geographic location information.
- Runtime database
- The context-based access component populates the high-volume database with runtime data. We can
configure this database as an embedded database or an external database.
The embedded database is suitable for small environments only. For large-scale, production environments, configure an external database.
Parent topic: Cluster support