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LB basic sku functionality and configuration in separate availability zones? RRS feed

  • Question

  • If we use basic sku LB which is free there is no option via ARM to add a certificate to this LB?  Can I place a web certificate on each web server(s)?,... and does this LB automatically distribute traffic to the online server should the other server become offline?

    We are assuming this is 3 web servers.  Can we place each of these web servers in separate availability zones with one basic sku LB?   Will using a standard sku LB make a difference in out scenario however this LB asks for a public IP??,... please confirm?

    Also wondering if we should use scale sets and place a web server on separate availability zones?  However scale sets also requires a LB.  thinking we would like to use the basic LB since it is free,... would be recommend this?


    dsk

    Saturday, October 19, 2019 6:23 PM

All replies

  • Hi, 

    Azure Load balancer is a Layer 4 component and you will not be able to add SSL cert in both Basic and Standard SKU. 

    You need to place the cert in each servers if you want to go with Load balancer. 

    Yes, LB will distribute traffic to servers which are online and servers which doesn't responds to probes are taken out of rotation and will not be served with web traffic until it responds back to the probe. 

    With Basic SKU, there is no concept of Availability Zones, you need to place VMs in an availability Sets. If you want to go with Standard SKU, you can choose any Zones for your VM. 

    Even in Standard SKU, you can have Internal or External LB. Only External LB requires a Public IP. 

    Its upto you to choose between Scalesets and VMs based on your requirement but again if you are going with Availability Zones, then you need to choose Standard SKU LB. If you are choosing Standard SKU, you can go with Zone redundant where Azure will place the nodes in different availability Zones. 

    You can use Basic SKU for LB, but it has few limitation as you will not be able to get the metrics, no HTTPS probes, No availability Zones, few more which you can check the below documentation for better understanding. 

    Reference: https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-overview 

    Let me know if you have any further questions. 

    Regards, 

    Msrini 

    Monday, October 21, 2019 3:16 AM
  • Hi, 

    Just checking in if you have had a chance to see the previous response. If this answers your query, do click “Mark as Answer” and Up-Vote for the same.

    Regards, 

    Msrini

    Wednesday, October 23, 2019 8:24 AM
  • Hi, 

    Just checking in if you have had a chance to see the previous response. If this answers your query, do click “Mark as Answer” and Up-Vote for the same.

    Regards, 

    Msrini

    Friday, November 1, 2019 1:25 PM