KMS Migration from 2008 R2 to Windows Server 2012 R2 and KMS Activation Known Issues

I use KMS for volume activation of Microsoft products. How do I migrate my KMS host from Windows Server 2008 R2 to Windows Server 2012 R2?

Windows 2008 VPS via KMS Migration from 2008 R2 to Windows Server 2012 R2 and KMS Activation Known Issues.