
304 Essentials of Cloud Computing
to the client tools on one side and interacts with the rest of the com-
ponents of the Eucalyptus infrastructure on the other side.
3. Node controller (NC): It is the basic component for nodes. It maintains
the life cycle of the instances running on each nodes. It interacts
with the OS, hypervisor, and the CC simultaneously.
4. Walrus storage controller (WS3): It is a simple le storage system. WS3
stores the machine images and snapshots. It also stores and serves
les using S3 APIs.
5. Storage controller (SC): It allows the creation of snapshots of volumes.
Itprovides persistent block storage over AoE or iSCSI ...