|Installation Guide / Eucalyptus Upgrade or Migration|
You can register additional components to bring high availability to your existing cloud. This topic provides instructions for registering additional Eucalyptus components (specifically Walrus) in an existing environment for the purpose of achieving high availability.
Registering redundant components to your existing Eucalyptus installation will take your platform into a highly available configuration. Registering the Cloud Controller, Cluster Controller and Storage Controller (with SAN adapter only) is fairly trivial but adding an additional Walrus requires that the user configure DRBD for bukkit storage replication.
Before you begin, ensure that you have completed the following:
service eucalyptus-cloud stop
cp -R --preserve /var/lib/eucalyptus/bukkits /newlocation/
cp -R --preserve /newlocation/* /var/lib/eucalyptus/bukkits/