Can CycleCloud create VM scale sets with multiple network interfaces?

Dave Unger 20

The tutorials and public CycleCloud examples on github only include entries for [[[network-interface eth0]]].

Adding a configuration section to the template for [[[network-interface eth1]]] does not cause a second network interface to be added to the scale set configuration.

Is there some other way to ensure that VMs in node arrays get created with multiple network interfaces?

vipullag-MSFT 24,206 Reputation points Microsoft Employee

2023-06-20T04:39:07.9466667+00:00

Hello Dave Unger

Welcome to Microsoft Q&A Platform, thanks for posting your query here.

Currently, adding multiple interfaces on a node array is not supported. (except the automatic IB interface for hpc VMs of course).

Usually, who need multiple interfaces use them on single VMs (for example a login node that is a gateway between two networks).

What is your use case and what are you trying to accomplish? Can you share more details so that I can check with internal team on this further.
Dave Unger 20 Reputation points

2023-06-20T14:41:03.27+00:00

Hi,
Thank you for responding.
I'm trying to use CycleCloud to build compute clusters with four network interfaces all on the same subnet. The software I'm trying to run requires multiple network interfaces and multiple IP addresses on each cluster VM.
I would appreciate any suggestions you might have on how to accomplish that, such as having CycleCloud create the cluster machines with one network interface each and adding the rest via a script.
vipullag-MSFT 24,206 Reputation points Microsoft Employee

2023-06-27T08:58:03.1733333+00:00

Hello Dave Unger

Any update on the issue?

Just checking in to see if you got a chance to see previous response.

Accepted answer

vipullag-MSFT 24,206 Reputation points Microsoft Employee

2023-06-23T05:44:32.0533333+00:00

Hello Dave Unger

Thanks for sharing more details, I have checked with internal team on this.

Your ask would be possible using a flexible scaleset for a nodearray. The flexible scaleset can support multiple nics.

However, the limitation is only one scale set per nodearray (1000 VMs max), and the scale-up/down time is not as good as w/ uniform. But assuming multiple nics on the head node is supported, it should work the same for execute nodes with flex.

Hope this helps.
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Dave Unger 20 Reputation points

2023-06-27T16:04:52.59+00:00

@vipullag-MSFT Thank you for the reply and follow up. I can see from here that the ability to use flexible scale sets was added in CycleCloud 8.3, and I'm using 8.4, so that's an option for me.

Do you know of any documentation other than the page I linked? Or any published examples or tutorials for using flexible scale sets with CycleCloud?

vipullag-MSFT 24,206 Reputation points Microsoft Employee

2023-07-10T04:37:56.5133333+00:00

Hello Dave Unger

Apologies for delayed response on this. That is the only document I can find.

If there are any specific questions, please let me know so that I can check with internal team and will get back.

Dave Unger 20 Reputation points

2023-07-14T15:55:43.6533333+00:00

Thank for your checking, @vipullag-MSFT

vipullag-MSFT 24,206 Reputation points Microsoft Employee

2023-07-17T05:07:18.3333333+00:00

Hello Dave Unger

Please 'Accept as answer', so that it can help others in the community looking for help on similar topics.
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Can CycleCloud create VM scale sets with multiple network interfaces?

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