Azure AD Connect (AADC) V2 upgrade case-by-case scenario

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Microsoft

Microsoft strongly recommends upgrading to AADC 2.0 or later by June 2022. Changes in AADC 2.X version can be checked at the following link.

What is Azure AD Connect v2.0? | Microsoft Docs

However, the actual customer's AADC server infrastructure is very diverse, so there are many concerns in making an upgrade plan. So, I would like to share a possible upgrade plan considering the customer's AADC server infrastructure.

 

Things to consider in advance

First of all, if the Windows Server version of the AADC server is 2012R2 or earlier, OS reinstallation is required. In-Place Upgrade for Windows Server with AADC is not supported.

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I also tried OS In-Place Upgrade once, the sync of AADC was normal, but I couldn't change the configuration at all.

It is also important to consider SQL Server. When using LocalDB, it is automatically upgraded to SQL 2019 Local DB within the upgrade process. However, if a separate SQL Server 2012 or earlier is used, reinstallation or upgrade to SQL Server 2014 or higher is required. Actually, a higher version would be better.

 

Three ways to upgrade

  1. Export & Import Setting: Create an export file including the current setting information and import this file when reinstalling AADC 2.X. In fact, this method can be used in all conditions, but it will also be necessary to verify whether it is normal after upgrading. How to import and export Azure AD Connect configuration settings | Microsoft Docs
  1. In-Place Upgrade : This is the most convenient way to migrate using the Wizard. Azure AD Connect: Upgrade from a previous version | Microsoft Docs
  1. Swing Migration: This is the recommended method to minimize the impact of changes due to the upgrade, but requires two or more AADC servers. Azure AD Connect: Upgrade from a previous version | Microsoft Docs

 

Based on the current AADC server infrastructure, which of the three upgrade methods could be chosen? The scenarios in the figure below are not absolute. If you have a better scenario, please share.

 

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