High Availability Architectures

SafeKit Module Definition

A module is a customization of SafeKit for an application. The module defines the high availability solution for the application and the recovery procedures for the application.

In practice, an application module is an Appli.Safe file (zip type) that contains:

• a main userconfig.xml configuration file which defines the type of SafeKit architecture chosen for the application
• application stop and start scripts

SafeKit offers two types of module detailed in this chapter:

• the mirror module with real time files replication and failover
• the farm module with network load balancing and failover

Multiple application modules can run on the same cluster allowing the implementation of advanced architectures: active/active, N-1 or mixed farm and mirror.