Spotinst Kubernetes Controller Now Supports Custom Labels Selectors

Labels are key/value pairs that are attached to objects, such as pods. With Labels, you can constrain a pod to only be able to run on particular nodes or to prefer to run on particular nodes.

We are happy to introduce support for Custom Labels and Node selectors when scaling capacity up or down.

Step 1; Add Labels to your Nodes

Add the following attribute to your ig_spec.yaml in your user-data start-up script.

nodeLabels:
    group: microservices
    kops.k8s.io/instancegroup: microservices

Step 2; Define your custom labels in Elastigroup

Add the property labels with key/value under group.thirdPartiesIntegration.kubernetes

{
  "group": {
    "name": "microservices.kubernetes.mycompany.local",
    "thirdPartiesIntegration": {
      "kubernetes": {
        "clusterIdentifier": "microservices-kubernetes-mycompany-local",
          "labels": [
            {
              "key": "group",
              "value": "microservices"
            },
            {
              "key": "kops.k8s.io/instancegroup",
              "value": "microservices"
            }
          ]
        }
      }
    }
  }
}

Once configured on both sides (Nodes / Elastigroup), the Spotinst Kubernetes Controller, will consider these constraints, and will only launch capacity into Elastigroup when Pods that are waiting to be scheduled have the matching labels defined on Elastigroup.

Built-in Labels Support

In addition, Built-in Labels are supported in scale down, the controller will look for other eligible instances in the cluster to accommodate the containers that run on the host that is scheduled for scale down.

kubernetes.io/hostname
failure-domain.beta.kubernetes.io/zone
failure-domain.beta.kubernetes.io/region
beta.kubernetes.io/instance-type
beta.kubernetes.io/os
beta.kubernetes.io/arch

This feature is now Generally Available in Elastigroup. Read more about it in our API Documentation.