Why do i need ILB for a Azure SQL AlwaysOn setup in a Vnet












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We are trying to setup SQL server alwayson for an application, but as per the documentation we need the ILB to map the listener. Just want to understand why do i need the ILB in the VNet if there is no public access required/ every resource is available in the local network?



Thanks,
Abhisek










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    0















    We are trying to setup SQL server alwayson for an application, but as per the documentation we need the ILB to map the listener. Just want to understand why do i need the ILB in the VNet if there is no public access required/ every resource is available in the local network?



    Thanks,
    Abhisek










    share|improve this question














    bumped to the homepage by Community 21 mins ago


    This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.


















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      0








      We are trying to setup SQL server alwayson for an application, but as per the documentation we need the ILB to map the listener. Just want to understand why do i need the ILB in the VNet if there is no public access required/ every resource is available in the local network?



      Thanks,
      Abhisek










      share|improve this question














      We are trying to setup SQL server alwayson for an application, but as per the documentation we need the ILB to map the listener. Just want to understand why do i need the ILB in the VNet if there is no public access required/ every resource is available in the local network?



      Thanks,
      Abhisek







      sql-server-2016 availability-groups azure






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      asked Nov 14 '17 at 22:23









      Linu1988Linu1988

      42115




      42115





      bumped to the homepage by Community 21 mins ago


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      bumped to the homepage by Community 21 mins ago


      This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
























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          Internal Load Balancer (ILB) requires Internal VIP as they are Layer 4 (TCP) load balancer where as external Load Balancer requires Public IP's as they function at layer 7 (DNS).



          When we put the Azure Resources in Availability Set, for sure you wish to apply rules on how incoming request will be distributed inside the Availability Group/Set so that if any resources is offline for some region such as maintenance, still user's or application request will be entertained by your SQL Server. Its the part of Business Continuity solution with higher SLA rate however their could be a performance impact. Moreover, you can troubleshoot the issues and bring back your resource online and get same performance as expected.
          This will be possible with the help of Internal Load Balancer which will be listening/monitoring your SQL Instance health.






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            Internal Load Balancer (ILB) requires Internal VIP as they are Layer 4 (TCP) load balancer where as external Load Balancer requires Public IP's as they function at layer 7 (DNS).



            When we put the Azure Resources in Availability Set, for sure you wish to apply rules on how incoming request will be distributed inside the Availability Group/Set so that if any resources is offline for some region such as maintenance, still user's or application request will be entertained by your SQL Server. Its the part of Business Continuity solution with higher SLA rate however their could be a performance impact. Moreover, you can troubleshoot the issues and bring back your resource online and get same performance as expected.
            This will be possible with the help of Internal Load Balancer which will be listening/monitoring your SQL Instance health.






            share|improve this answer




























              0














              Internal Load Balancer (ILB) requires Internal VIP as they are Layer 4 (TCP) load balancer where as external Load Balancer requires Public IP's as they function at layer 7 (DNS).



              When we put the Azure Resources in Availability Set, for sure you wish to apply rules on how incoming request will be distributed inside the Availability Group/Set so that if any resources is offline for some region such as maintenance, still user's or application request will be entertained by your SQL Server. Its the part of Business Continuity solution with higher SLA rate however their could be a performance impact. Moreover, you can troubleshoot the issues and bring back your resource online and get same performance as expected.
              This will be possible with the help of Internal Load Balancer which will be listening/monitoring your SQL Instance health.






              share|improve this answer


























                0












                0








                0







                Internal Load Balancer (ILB) requires Internal VIP as they are Layer 4 (TCP) load balancer where as external Load Balancer requires Public IP's as they function at layer 7 (DNS).



                When we put the Azure Resources in Availability Set, for sure you wish to apply rules on how incoming request will be distributed inside the Availability Group/Set so that if any resources is offline for some region such as maintenance, still user's or application request will be entertained by your SQL Server. Its the part of Business Continuity solution with higher SLA rate however their could be a performance impact. Moreover, you can troubleshoot the issues and bring back your resource online and get same performance as expected.
                This will be possible with the help of Internal Load Balancer which will be listening/monitoring your SQL Instance health.






                share|improve this answer













                Internal Load Balancer (ILB) requires Internal VIP as they are Layer 4 (TCP) load balancer where as external Load Balancer requires Public IP's as they function at layer 7 (DNS).



                When we put the Azure Resources in Availability Set, for sure you wish to apply rules on how incoming request will be distributed inside the Availability Group/Set so that if any resources is offline for some region such as maintenance, still user's or application request will be entertained by your SQL Server. Its the part of Business Continuity solution with higher SLA rate however their could be a performance impact. Moreover, you can troubleshoot the issues and bring back your resource online and get same performance as expected.
                This will be possible with the help of Internal Load Balancer which will be listening/monitoring your SQL Instance health.







                share|improve this answer












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                answered Nov 17 '17 at 4:01









                Delta DDelta D

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