Scaling and Placement

HostingConfig carries three knobs that shape where a resource’s pods run, how they roll out on every new revision, and how many of them are kept available during voluntary disruptions.

Node pool

Pin a resource to a named node pool declared on the target cluster:

hosting:
  cpu: 500m
  memory: 512Mi
  minReplicas: 2
  nodePool: gpu-l4

A node pool is a cluster-side catalogue entry that captures a nodeSelector and an optional list of tolerations. When you pin a resource to gpu-l4, the operator stamps both onto the pod template, so the pods only schedule onto nodes that match the selector and can tolerate the pool’s taints.

Available pools are declared per-cluster (see ClusterConfig.nodePools) and surfaced in the console’s resource-creation form as a segmented picker. Leaving nodePool unset means “no placement constraint” — pods land on any schedulable node.

The platform rejects a resource pinned to a pool that the target cluster doesn’t expose, with the list of available pool names in the error message.

Deploy strategy

Pick how Kubernetes rolls a new revision:

Strategy	Behavior
Rolling	Default. Replaces pods gradually, keeping the service available.
Recreate	Tear all old pods down before starting any new ones. Required when two
	versions of the workload can’t coexist (exclusive locks, single-writer DBs).

hosting:
  deployStrategy: Recreate

Pod disruption budget

When pdb.minAvailable is set, the operator reconciles a policy/v1 PodDisruptionBudget alongside the Deployment. Kubernetes will refuse voluntary disruptions (node drains, pod evictions) that would take the ready count below this floor.

hosting:
  minReplicas: 3
  pdb:
    minAvailable: 2

Clearing the pdb field (or its minAvailable) deletes the previously-reconciled PDB.

Updating an existing resource

These fields are part of HostingConfig, so they can be patched via the same PATCH /resources/{slug} endpoint as cpu, memory, and replica counts. Operator picks up the change on the next reconcile and applies it without redeploying the image.