Use the Guest Customization wizard to save guest operating system settings in a specification that you can apply when cloning virtual machines or deploying from templates.


Ensure that all requirements for customization are met. See Guest Operating System Customization Requirements.


  1. From the vSphere Web Client Home inventory page, select Rules and Profiles > Customization Specification Manager.
  2. Click the Create a New specification icon.
  3. Select Linux from the Target VM Operating System drop-down menu, and enter a name and description for the specification.
  4. Enter the guest operating system's computer name.

    The operating system uses this name to identify itself on the network. On Linux systems, it is called the host name.



    Enter a name

    1. Type a name.

      The name can contain alphanumeric characters and the hyphen (-) character. It cannot contain periods (.) or blank spaces and cannot be made up of digits only. Names are not case-sensitive.

    2. To ensure that the name is unique, select Append a numeric value to ensure uniqueness. This action appends a hyphen followed by a numeric value to the virtual machine name. The name is truncated if it exceeds 63 characters when combined with the numeric value.

    Use the virtual machine name

    The computer name that vCenter Server creates is identical to the name of the virtual machine on which the guest operating system is running. If the name exceeds 63 characters, it is truncated.

    Enter a name in the Clone/Deploy wizard

    The vSphere Web Client prompts you to enter a name after the cloning or deployment is complete.

    Generate a name using the custom application configured with vCenter Server

    Enter a parameter that can be passed to the custom application.

  5. Enter the Domain Name for the computer and click Next.
  6. Select the time zone for the virtual machine and click Next.
  7. Select the type of network settings to apply to the guest operating system.



    Standard settings

    Select Use standard network settings and click Next.

    vCenter Server configures all network interfaces from a DHCP server using default settings.

    Custom settings

    1. Select Manually select custom settings.

    2. For each network interface in the virtual machine, click the pencil icon.

    3. Enter IP address and other network settings and click OK.

    4. When all network interfaces are configured, click Next.

  8. Enter DNS and domain settings information.
  9. Click Finish to save your changes.


The customization specification that you created is listed in the Customization Specification Manager. You can use the specification to customize virtual machine guest operating systems.