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2.4. About Hosts

A host is a single computer. Hosts provide the computing resources that run the guest virtual machines. Each host has hypervisor software installed on it to manage the guest VMs. For example, a Linux KVM-enabled server, a Citrix XenServer server, and an ESXi server are hosts.
The host is the smallest organizational unit within a CloudStack deployment. Hosts are contained within clusters, clusters are contained within pods, and pods are contained within zones.
Hosts in a CloudStack deployment:
Additional hosts can be added at any time to provide more capacity for guest VMs.
CloudStack automatically detects the amount of CPU and memory resources provided by the Hosts.
Hosts are not visible to the end user. An end user cannot determine which host their guest has been assigned to.
For a host to function in CloudStack, you must do the following: