User`s guide

Chapter 3 Managing the Barracuda Spam Firewall ■ 51
Configuring Advanced Settings
Setting Up Clustered Environments
The ADVANCED-->Clustering page lets you link multiple Barracuda Spam Firewall systems together
so they can synchronize configuration settings. You can also use this page to specify standby systems to
use in case an active system goes down.
Clustering is available on the Barracuda Spam Firewall models 400 and 600.
Clustering not only makes managing multiple Barracuda Spam Firewall systems more manageable, but
also provides 100% redundant coverage of the propagated data.
The following table lists the information that is and is not propagated to the other clustered systems.
Each user account has a primary and backup server in the cluster. The primary is the server that first to
joins cluster, and the secondary is the next server joining the cluster. There are always two servers at all
times that have the same information (configuration and quarantine messages).
The following table describes the settings on the ADVANCED-->Clustering page.
Propagated Data Data Not Propagated
System settings (global and domain)
configured through the Administration interface
System IP configuration described on page 32.
Per-user quarantine settings configured
through a user’s quarantine interface
SSL settings described on page 60.
Message logs
Bayesian databases
Quarantine inboxes
Field Description
Cluster Settings
Cluster Shared Secret The passcode shared by all Barracuda Spam Firewall systems in this
cluster. All Barracuda Spam Firewalls in a cluster must have the same
shared passcode.
Make sure a passcode has already been set on an existing system before
you try adding this system to the cluster.
Cluster Host Name The host name for this system. The other systems in this cluster use this
host name when communicating with this system. When this field is blank,
the system IP address is automatically used.
If this host name cannot be resolvable by DNS, create an entry in the Local
Host Map field at the bottom of this page on each Barracuda Spam Firewall
in the cluster before adding this machine into the cluster.
Clustered Systems
Cluster Field Enter the IP address or host name of one of the Barracuda Spam Firewall
systems in the cluster you want to join, and click Join Cluster.
Once this system joins the cluster, configuration settings are pulled from the
cluster that is joined and override the settings on this system. User lists are
synced between the cluster and this machine so that any users on this
machine are not lost, but integrated into the cluster.
A system successfully joins a cluster when the IP address of each system
in the cluster appears in an active state with a green status light.