UbuntuHelp:UEC/Architecture
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A UEC system includes physical machines running the following services:
- eucalyptus-cloud - includes the front-end services, Cloud Controller
- eucalyptus-cc - includes the Cluster Controller that provides support for the virtual network overlay
- eucalyptus-sc - includes the Storage Controller
- eucalyptus-walrus - includes the Walrus storage system
- eucalyptus-nc - includes the Node Controller that interacts with KVM through Libvirt to manage individual VMs
In a basic UEC setup, the system is composed of two machines (a front-end and a node). The front end runs both `eucalyptus-cloud` and `eucalyptus-cc` in this configuration. The node runs the node controller, `eucalyptus-nc`. It is possible to separate the cloud controller and cluster controller in a more complex multi-host setup. The following diagram depicts a simple setup: 模板:Http://pompone.cs.ucsb.edu/~nurmi/images/euca-topo-nonet.png UEC assumes that each node in the system belongs to a cluster and that each cluster belongs to a cloud. Each node runs the eucalyptus-nc service. Similarly, each cluster (again, there is only one cluster in this example) must run the eucalytpus-cc service. These components must be registered with each other before the system starts.
