[[failover-security-realm]]
= Failover Security Realm

The failover security realm allows for a realm to fail-over to another realm in case the first is unavailable.

The `failover-realm` resource contains the following attributes: -

 * `delegate-realm` - The realm to use as a default.
 * `failover-realm` - The realm to use in case `delegate-realm` is not available.
 * `emit-events` - Whenever to emit SecurityEvent in case the `delegate-realm` is unavailable.

== Defining a Failover

Assuming two realms `properties-realm` and `jdbc-realm` already exist an `failover-realm` combining these two can be created with the following command.

[source,options="nowrap"]
----
/subsystem=elytron/failover-realm=theRealm:add(delegate-realm=jdbc-realm, failover-realm=properties-realm)
----

NOTE: The `failover-realm` keeps modifiability of the `delegate-realm` unless failover happens. In that case, the `failover-realm`
will function as unmodifiable.
