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How to Change the Unique ID Value in vCenter Server

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Changing the Unique ID of a vCenter Server

In large environments where multiple vCenter Servers are distributed, it is possible that the “Unique ID” value may be duplicated, leading to significant conflicts within the vSphere environment. The Unique ID value must be between 0 and 63, and it is generated randomly by default, but can be modified manually after the vCenter Server has been deployed. In this blog post, we will explore two methods for changing the Unique ID of a vCenter Server: using the user interface or PowerCLI commands.

Changing the Unique ID via the User Interface

To change the Unique ID via the user interface, follow these steps:

1. Log in to the vCenter Server management console.

2. Navigate to the “Configuration” tab.

3. Click on “Advanced Settings.”

4. In the “Entity” dropdown menu, select the default virtual infrastructure server.

5. In the “Name” field, select “instance.id.”

6. In the “Value” field, enter a new Unique ID between 0 and 63.

7. Click “Apply” to save the changes.

Changing the Unique ID via PowerCLI Commands

To change the Unique ID via PowerCLI commands, follow these steps:

1. Open the PowerCLI console.

2. Use the “Get-AdvancedSetting” cmdlet to retrieve the current Unique ID of the vCenter Server.

3. Use the “Set-AdvancedSetting” cmdlet to change the Unique ID to a new value between 0 and 63.

Example:

Get-AdvancedSetting -Entity $global:DefaultVIServer -Name instance.id

Get-AdvancedSetting -Entity $global:DefaultVIServer -Name instance.id | Set-AdvancedSetting -Value 58

After modifying the Unique ID, it is essential to restart the vCenter Server service for the changes to take effect. Alternatively, you can restart the vCenter Server entirely.

Note: Before changing the Unique ID, it is recommended to verify the current ID of the vCenter Server using the “Get-AdvancedSetting” cmdlet. This will ensure that you are modifying the correct ID.

Conclusion

Changing the Unique ID of a vCenter Server can be done via the user interface or PowerCLI commands. It is essential to verify the current ID before making any changes and to restart the vCenter Server service or entirely after modifying the ID for the changes to take effect. By following these steps, you can ensure that your vSphere environment is free from conflicts caused by duplicated Unique IDs.

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