adding a 3rd VM to Load balancer backend pool

Mos Craciun 0

Hi, I have created 2 vm's and added them to back-end pool, and everything works fine. i have created a 3rd vm same config, region, availability, network settings and this one does not show in the list of back-end pool of load balancer so i can add it. is there a bug, or a solution for it?

thanks

TP 82,656 Reputation points

2023-07-30T14:55:09.34+00:00

What SKU is the load balancer? Basic or Standard?
GitaraniSharma-MSFT 49,171 Reputation points Microsoft Employee

2023-07-31T11:14:41.13+00:00

Hello @Mos Craciun ,

Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

As mentioned by @msrini-MSFT below and documented in the below article:

https://video2.skills-academy.com/en-us/azure/load-balancer/load-balancer-common-deployment-errors

Both Public IP SKU and Load Balancer SKU must match. For Standard LB, the Public IP of VM must be Standard SKU and for Basic LB, the Public IP of VM must be Basic SKU.

Refer: https://video2.skills-academy.com/en-us/azure/load-balancer/manage#ip-address

Could you please check if the 3rd VM has a Public IP and if yes, make sure it's SKU matches that of load balancer SKU?

And if you have a Basic load balancer, then check the below limitation:

For Basic Sku load balancer, network interface and load balancer have to be in the same availability set.

Regards,

Gita
GitaraniSharma-MSFT 49,171 Reputation points Microsoft Employee

2023-08-03T15:31:59.1433333+00:00

@Mos Craciun , Could you please provide an update on this post?

1 answer

msrini-MSFT 9,266 Reputation points Microsoft Employee

2023-07-31T05:06:31.3033333+00:00

Hi,

You cannot mismatch the SKUs in load balancer. When you create the load balancer, you should have selected the SKU as either Basic or Standard. When you create a new VM, you could have created a Public IP and associated that to the VM which could be either basic or standard.

If you can check the LB SKU and match it with the Public IP SKU which is associated with the VM, you can add the VM to the backend pool.

Regards,

Karthik Srinivas
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adding a 3rd VM to Load balancer backend pool

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