Before you deploy a VM, you can set guest variables to pass user data to your VMs. This functionality uses cloud-init and requires appropriate templates. In private cloud, the templates must have the guest setup flag set to cloud init. The administrator can add default variables for the VM template.
This functionality is available through the API. The platform stores variables in the VirtualMachine "variables" attribute, which is a dictionary of keys and values. See Update a virtual machine in VirtualMachinesResource
To add VM variables:
Go to Virtual datacenters → edit a VM that is not deployed → Variables
Enter each Key and Value
The length of these can be up to 255 characters each
To delete a variable click the trash can symbol beside the Key. To edit the Value of a variable, click the pencil edit button beside the Value
To apply changes to variables, and other changes to the VM, click Save