How to Add Instances to a Cluster

1 min readUpdated 28 October 2026

Add existing instances to a Vultr cluster using the Console or API, with fabric networking configured automatically.

Adding instances to a cluster associates existing instances with the cluster. For a GPU Fabric Cluster, the high-performance interconnect (RoCE or InfiniBand) is provisioned when instances join, and no manual VLAN or PKey setup is needed. You can add a single instance or multiple instances at once.

Note

An instance can belong to only one cluster at a time, and all instances in a cluster must be in the same region as the cluster.
You can add instances beyond desired_pool_count. The cluster never trims the surplus back down on its own.

Follow this guide to add instances to a cluster using the Vultr Console or the Vultr API.

In the left-hand menu, click Compute, then click Clusters.
Click your target cluster to open its management page.
In Cluster Nodes, click Add Nodes.
In the Attach Instances panel, select New Nodes to deploy new instances on the cluster's plan, or Existing Nodes to attach instances you already have.
For New Nodes, set the Number of Instances and a label for each, then review the cost shown before confirming. For Existing Nodes, select one or more instances from the list.
Click Save Changes.

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Add Instances to a Vultr Cluster with the Console or API | Vultr Docs