Introduction

With v8.0.0 the Open-Xchange Middleware offers an alternative way to manage and store sessions using Redis in-memory data structure store. The Redis store is used as central session storage replacing both - in-memory per-node SessionD and (Hazelcast-backed) session storage.

Since it acts as a central session storage, many problems related to remote invalidation of sessions are thus solved while maintaining the benefits offered by Hazelcast-backed session storage: sessions survive server restarts and/or upgrades, and are accessible for each node, independently from where the session got spawned.

Configuration

This feature is included in open-xchange-core package. Thus, no additional packages need to be enabled.

However, to finally enable Redis Session Storage, the property "com.openexchange.sessiond.redis.enabled" needs to be set to "true". By doing this, the former in-memory SessionD storage is effectively disabled. Also, the Hazelcast-backed session storage should be disabled by setting "com.openexchange.sessionstorage.hazelcast.enabled" to "false".

Of course, a running Redis installation is required and appropriate configuration settings for the Open-Xchange Redis Connector need to be defined.

# Properties for Redis connector

# Configure accessing Redis end-point
com.openexchange.redis.mode=standalone
com.openexchange.redis.hosts=localhost:6379
com.openexchange.redis.ssl=false
com.openexchange.redis.starttls=false

# If left empty means no user-name and/or password required
com.openexchange.redis.username=
com.openexchange.redis.password=

There are a bunch more properties that can be set.

Configuration

As mentioned previously, access to Redis needs to be configured properly. Also, the Hazelcast-backed session storage should be disabled by setting "com.openexchange.sessionstorage.hazelcast.enabled" to "false".