IP Address of VMSS instances thorugh self deployed website on instance 1 ?

Question

Is there a way for an instance in a Virtual Machine Scale Set to discover the other instances (private IP addresses) within the same Scale Set? The VMSS is set to auto-scale, so other instances may come and go at any time. Suppose I have deployed an application in my first instance that tells the private and public IP of that instance. When there is auto-scaling the instances would also increases. So when we run the application it always tells the ip of first instance where application was deployed. What would the procedure to know the IP of that instance where request is being served. Suppose 3 instances are created and now user request the application it should tells me the IP address of that particular instance like first time it says IP of instance A next time when there were three instances due to autoscaling it should tell me the IP of third instance where request is served? Do anyone have solution to this ?

I deployed application to instance 1 which gives me IP. This public IP is mapped with some DNS. When three instances were created and I tried that website it still gives me same instance 1 IP.

Answer 1

Hi,

I think you will need Public IP addresses for each VM if you want it to divert the traffic on other VMSS instances, check this page and detailed recommendations on the options you can try. However the LB will always takecare of the backend servers when they are scaled so not sure what is your requirements on this.

Read about Multiple NICs and Public IP addresses assignment.
virtual-machine-scale-sets-networking

Hope this helps.
JS

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