Customize guest OS

When cloning a virtual machine or deploying it from a template, you need to provide vCenter Server with the information necessary to give the VM its own unique identity, such as the IP address, passwords, computer name, and license settings. This prevents conflicts that occur when VMs with identical settings are deployed, for example with the same hostname or IP address.

With customization specification, you can provide all information only once and then apply it as needed when cloning a VM or deploying it from a template. Note that the guest OS that is being customized must have VMware Tools installed.

Here are the steps to create a customization specification using vSphere Web Client:

1. Under Monitoring, click the Customization Specification Manager icon:

customization specification manager

2. Click the Create a new specification icon:

new customization specification

3. The New VM Guest Customization Spec wizard opens. Select the Target VM Operating System and type the name and description of the new specification:

new customization specification target os

4. Enter registration information and click Next:

new customization specification registration information

5. Enter the computer name. We’ve selected the Use the virtual machine name option to keep the guest OS computer name matched up with the VM name:

new customization specification name

6. Enter the license information and click Next:

new customization specification license information

7. Set the administrator password:

new customization specification password

8. Select the timezone:

new customization specification timezone

9. If you have any commands you would like to run the first time a user logs on, supply them here:

new customization specification run once

10. Choose the network settings:

new customization specification network settings

11. Select whether you want to join a workgroup or a domain:

new customization specification domain

12. Select whether you would like to generate a new SID:

new customization specification sid

13. Click Finish to end the wizard:

new customization specification finish

During cloning or deployment, you can select the customization specification you’ve just created to apply to the new VM.

Geek University 2021