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Chapter 17. Templates
17.1. Virtual Machine Template Elements
The
templates collection provides information about the virtual machine templates in a Red Hat Virtualization environment. An API user accesses this information through the rel="templates" link obtained from the entry point URI.
Additional information can be retrieved for
GET requests using the All-Content: true header.
The following table shows specific elements contained in a virtual machine template resource representation.
| Element | Type | Description | Properties |
|---|---|---|---|
link rel="disks" | relationship | A link to the disks sub-collection for virtual machine template resources. | 
|
link rel="nics" | relationship | A link to the nics sub-collection for virtual machine template resources. | |
link rel="cdroms" | relationship | A link to the cdroms sub-collection for virtual machine template resources. |
|
link rel="permissions" | relationship | A link to the permissions sub-collection for virtual machine template permissions. | |
type | enumerated | The type of virtual machine the template provides. A list of enumerated values are available in capabilities. | |
status | One of illegal, locked or ok | The template status. These states are listed in template_states under capabilities. |
|
memory | integer | The amount of memory allocated to the guest, in bytes. | |
cpu | complex | The CPU topology (i.e. number of sockets and cores) available to the guest. | |
os type= | string, e.g. RHEL5 or WindowsXP | The guest operating system type. | |
os boot dev= | enumerated | A list of boot devices, described by a dev attribute on a boot element. A list of enumerated values are available in capabilities. | |
os kernel | string | A path to a kernel image which the template is configured to boot from. | |
os initrd | string | A path to an initrd image to be used with the kernel above. | |
os cmdline | string | A kernel command line parameter string to be used with the kernel above. | |
cluster id= | GUID | A reference to the template's host cluster. | 
|
vm id= | GUID | A reference to the VM on which this template is based. | 
|
domain id= | GUID | A reference to the template's domain. |
|
creation_time | xsd:dateTime format: YYYY-MM-DDThh:mm:ss | The date and time at which this template was created. |
|
origin | One of rhev, ovirt, vmware or xen | The system from which this template originated. |
|
high_availability | complex | Set enabled to true if the VM should be automatically restarted if the host crashes. A priority element controls the order in which VMs are re-started. | |
display | complex | The display type (either vnc or spice), port, and the number of monitors. The allow_reconnect Boolean value specifies if a client can reconnect to the machine via display. | |
stateless | Boolean: true or false | A stateless template contains a snapshot of its disk image taken at boot and deleted at shutdown. This means state changes do not persist after a reboot. | |
usb | complex | Defines the USB policy for a virtual machine template. Requires an enabled element set to a Boolean value and a type element set to either native or legacy.
Important
The Legacy USB option has been deprecated and will be removed in Red Hat Virtualization 4.1.
| |
placement_policy | complex | Sets the placement policy for virtual machine migration. Requires a default host= and an affinity (one of migratable, user_migratable or pinned). Leave the host element empty to set no preferred host. | |
custom_properties | complex | A set of user-defined environment variable passed as parameters to custom scripts. Each custom_property contains name and value attributes. A list of enumerated values are available in capabilities. | |
timezone | tz database format: Area/Location | The the Sysprep timezone setting for a Windows virtual machine template. | |
domain | complex | The the Sysprep domain setting for a Windows virtual machine template. Requires a name from the domains collection. |
