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Dynamically change workload affinity in Kubernetes. Useful for testing, development and reacting to environmental changes.

Installation

This will install the operator and custom resources

Requires cert manager installed

kubectl apply -f https://github.com/cloud-native-skunkworks/placement-operator/releases/download/latest/release.yaml

Run the demo

This will install placement-application with a unique layout that you can adjust the strategy of.

kubectl apply -f https://github.com/cloud-native-skunkworks/placement-operator/releases/download/latest/demo.yaml

Design

There are initial two modes of operation balanced and stacked within the Layout.

Custom resource

The custom resource is called Layout and is defined as follows:

apiVersion: core.cnskunkworks.io/v1alpha1
kind: Layout
metadata:
  name: layout-sample
spec:
  # balanced | stacked 
  strategy: stacked

To utilise this resource a workload must use spec.template.metadata.labels

spec:
  template:
    metadata:
      labels:
        app: placed-application-demo
        cnskunkworks.io/placement-operator-enabled: "true"
        cnskunkworks.io/placement-operator-layout: layout-sample

Setting a strategy will rebalance, this can be both balanced or stacked this can be updated dynamically within the layout custom resource and will recreate pods.

TODO

  • Add custom DSL to create layout conditions
  • Add additional default layout types
  • Allow for graceful pod termination and restart conditions