Any way to assign a static IP to an Azure ML Compute Cluster?

Hi Daniel Hargis

Welcome to Microsoft Q&A and Thank you for reaching out.

Azure Machine Learning does not support assigning a static public IP address directly to a Compute Cluster. When using a Compute Cluster in a private virtual network (VNet), it is dynamically assigned an IP address upon creation, and you cannot statically assign it on your firewall.

Azure ML compute clusters are implemented using Azure-managed VM Scale Sets. Nodes are created and destroyed as the cluster scales. Because of this design, Azure does not support assigning or preserving a static public IP on the compute nodes themselves.

Placing the Azure ML workspace and compute cluster in a private virtual network controls inbound access, but it does not control outbound IP addresses. Without additional configuration, outbound traffic uses Azure’s default SNAT, which results in dynamic and unpredictable egress IP

supported and recommended solution to obtain a static outbound IP for an Azure ML compute cluster is to use an Azure NAT Gateway. When a NAT Gateway is associated with the subnet containing the compute cluster, all outbound traffic from that subnet uses the NAT Gateway’s public IP(s).

Static IP behavior with NAT Gateway:

A NAT Gateway can be configured with:

A single static public IP, or

A public IP prefix (small fixed range)

This provides a stable and predictable outbound IP that can be allowlisted on external web resources.

Required configuration

To use a NAT Gateway:

The Azure ML compute cluster must be deployed in a custom VNet

The NAT Gateway must be associated with the same subnet

No changes are required in Azure ML settings themselves

If the compute cluster already exists, it may need to be recreated to ensure traffic flows through the NAT Gateway.

please refer to the following documentation:

• Egress with VNet injection
• How to assign a single public IP for VNet-injected workspaces using Azure Firewall
• Static private IP address configuration
• Create an Azure Machine Learning compute cluster

I Hope this helps. Do let me know if you have any further queries.

Thank you!

Hi Daniel Hargis

Did you get any chance to review the above response. Thank you!