Hi @Arvind Kumar Gautam ,
Welcome to Microsoft Q&A!
To begin with, I am not an expert in Linux and I am not very familiar with Linux clusters. Howerver, domain controller is a Windows concept.
Please read this part of the document: The listener under Linux
Is your environment undergoing failover?
For building Alwayson on Ubuntu, here is the related documents.
Deploy a Pacemaker cluster for SQL Server on Linux
Create and configure an availability group for SQL Server on Linux
Best regards,
Seeya··
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