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Dynamics 365 Community / Forums / Business Central forum / Layered topology with ...
Business Central forum

Layered topology with high availability

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Posted on by Community Member

Hi all,

I am trying to setup a BC environment on Azure with fully layered architecture and high availability. The high level design is: 

Load Balancer --> 2 web servers --> Load Balancer --> 2 bc servers --> SQL PaaS.

Although the topology is supported, I couldn't find any documentation regarding high availability and load balancing with this topology. I have difficulties to setup web servers to redirect traffic to the internal load balancer. How you secure sticky sessions through all layers? Which load balancer is required?

Any experiences or best practices would be highly appreciated.

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  • Kostas Loungos Profile Picture
    Kostas Loungos 5 on at

    Hi,

    The problem with this topology is in the second load balancer. The web servers and the application servers need to have Kerberos Trust Delegation enabled to use windows authentication and Azure load balancers do not support that. So for that layer you need to use a load balancer from a vendor that supports kerberos. We implemented this topology using a load balancer from KEMP Technologies which is one of many available in azure marketplace. So the final topology looks like this

    Azure Load Balancer -> Web Servers -> KEMP Load Balancer -> Application Servers -> SQL PaaS

    Having this we joined KEMP Load balancer in the domain and configured trust delegation between web servers and KEMP LB and then between KEMP LB and the application servers.

    This setup was done as a proof of concept for now without any issues and in the next few months we will deploy it productively.

  • Jaiganeshs Profile Picture
    Jaiganeshs 10 on at

    Hi, we have the similar setup. Did you find a way to do this? Please share details if you got the solution.

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