where is a azure loadbalancer's zone?

Question

Hi Teams!

I'd like to ask something about azure loadbalancer.

When creating a public load balancer, no zones are selected separately.

But in reality, load balancers will be deployed to physical data centers.

which zone will it be deployed?

Answer 1

Hi @jenny ,

the zones of a public load balancers are related to the zone configuration of the public IPs.

The load balancer's availability zone selection is synonymous with its frontend IP's zone selection. For public load balancers, if the public IP in the Load balancer's frontend is zone redundant then the load balancer is also zone-redundant. If the public IP in the load balancer's frontend is zonal, then the load balancer will also be designated to the same zone.

Source: Availability zone support

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten

Answer 2

Hi @jenny ,

please let me know why load balancer(zone1) can connect to vm(zone2).

The connection of load balancer (Zone 1) and the VM (Zone 2) is via Backend Pool configuration and is using the private IP of the VM.

The configuration should look like this:

Source: https://learn.microsoft.com/en-us/azure/load-balancer/quickstart-load-balancer-standard-public-portal

A Virtual Network spans all availability zones in a region. That is the "trick" why the Load Balancer in Zone 1 and the VM in Zone 2 are able to connect/communicate.

Source: Virtual networks and availability zones

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten

Answer 3

Hi Thank you for your answer!

you're telling me that load balancer is deployed same zone with Frontend IP?

so then I have one more question.

I have deployed load balancer's frontend ip zone 1 and backend vm have been deployed in zone 2.

but connect is good. there is no probelm to connect?

please let me konw why load balancer(zone1) can connet to vm(zone2).