Azure VM in availability Zone

Question

I have read that when we create azure VMs in availability zone, it gives zone redundancy.

(Lets take for west europe)
Now at the time of creating Azure VM, when i select the option for Availability Zone Redundancy and select Zone 1 , does it automatically create redundancy.

Should i not manually create another Azure VM in Zone 2 again to build the redundancy ?

So my question is do i not need to build another Azure VM in another zone to build zone redundancy or does azure automatically take care of it ?

Answer 1

Hi @MyAzQuery ,

an Azure Virtual Network (including the related subnets) are spanning all Availability Zones in an Azure region.
Means your VMs in different Availiability Zones could be connected to the vNet RG_VM-vnet subnet default.

Please take a look here:
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-overview#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 2

Hi @MyAzQuery ,

to build the redudancy using Availabilty Zones you need to deploy at least 2 VMs, one in each Availabilty Zone (for instance 1 and 2).
One VM in one Availabilty Zones doesn't offer any redundancy.
https://learn.microsoft.com/en-us/azure/virtual-machines/availability

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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 @MyAzQuery ,

each VM will have its own Private IP address.

To reach both VMs (for instance 2 web servers) with one Private IP you need a private Load Balancer with one private IP in the frontend and both VMs with private IP in the backend configuration:
https://learn.microsoft.com/en-us/azure/virtual-machines/availability#load-balancer
https://learn.microsoft.com/en-us/azure/load-balancer/components#frontend-ip-configurations

If you have two DCs in an Availaibilty Zone you don't need a Load Balancer. Both VMs will be added to DNS with the individual private IPs.

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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 4

Hi @MyAzQuery ,

You don't need a Public IP for a VM using an Availability Zone config / A Public IP is not required for a VM in an Availiablity Zone. Just expand the Public IP list and select none

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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