vRA-Lab-10-Configure Machine Prefixes

Fabric administrators create machine prefixes that are used to create names for machines provisioned through vRealize Automation. Tenant administrators and business group managers select these machine prefixes and assign them to provisioned machines through blueprints and business group defaults.

A prefix is a base name to be followed by a counter of a specified number of digits. When the digits are all used, vRealize Automation rolls back to the first number.

Machine prefixes must conform to the following limitations:

  • Contain only the case-insensitive ASCII letters a through z, the digits 0 through 9, and the hyphen (-).
  • Not begin with a hyphen.
  • No other symbols, punctuation characters, or blank spaces can be used.
  • No longer than 15 characters, including the digits, to conform to the Windows limit of 15 characters in host names.

Longer host names are truncated when a machine is provisioned, and updated the next time data collection is run. However, for WIM provisioning names are not truncated and provisioning fails when the specified name is longer than 15 characters.

NOTE: vRealize Automation does not support multiple virtual machines of the same name in a single instance. If you choose a naming convention that causes an overlap in machine names, vRealize Automation does not provision a machine with the redundant name. If possible, vRealize Automation skips the name that is already in use and generates a new machine name using the specified machine prefix. If a unique name cannot be generated, provisioning fails.


Log in to the vRealize Automation console as a fabric administrator. In my case, I have created one already in my Active Directory with name “vmexpo-fadmin@vcaplab.local” and gave permission to configure fabric group during “create Fabric Group” Configuration.

Enter the “credentials” and click “Login”



Once you login. Follow the walkthrough wizard in “My Goals” or go to “infrastructure” tab-> Blueprint -> Machine Prefixes > Click “New Machine Prefixes”.


Enter the “machine prefix”, “Number of Digits” and enter the “counter start number”. Once done, click on Green good sign to “Save”.


Verify the added Machine prefixed as shown below.



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