|Plan Your Installation / Plan Eucalyptus Features|
Eucalyptus includes the ability to run redundant, hot-swappable instances for the CLC, Walrus, CC, SC, and VMware Broker components. In a high availability (HA) configuration, a failure of any single component will not cause the system to halt.
If your network configuration includes redundant networking hardware and routing paths, HA Eucalyptus can then tolerate a network component failure (for example, the loss of a networking switch) without halting.
The deployment choices for HA Eucalyptus are similar to a regular Eucalyptus deployment, with the following additional considerations:
The following images shows a single cluster deployment with the component pairs at the cloud and cluster level. The NCs are not redundant.
Note that the same considerations for a regular Eucalyptus deployment with respect to networking mode and components placement apply to HA Eucalyptus in addition to the need for redundant component pairs to be able to communicate. Note also that the NC components are deployed redundantly in an HA Eucalyptus deployment. If a machine running an NC fails, Eucalyptus will continue to be available for user requests. However, instances running on that specific NC will be lost.