node-labeler-operator

kubernetes operator to auto label/taint/annotate node based on a CRD.

NOTE: This is an alpha-status project. We do regular tests on the code and functionality, but we can not assure a production-ready stability.

Requirements

node-labeler-operator is meant to be run on Kubernetes 1.8+. All dependecies have been vendored, so there's no need to any additional download.

Usage

Installation

In order to create node-labeler-operator inside a Kubernetes cluster, the operator has to be deployed. It can be done with a deployment.

kubectl run node-labeler-operator --image=barpilot/node-labeler-operator --namespace=kube-system

Configuration

node-labeler-operator is using a CRD for its configuration. Here is a description of an object:

apiVersion: labeler.barpilot.io/v1alpha1
kind: Labeler
metadata:
  name: example
  labels:
    operator: node-labeler-operator
spec:
  nodeSelectorTerms:
  - matchExpressions:
    - key: kubernetes.io/hostname
      operator: In
      values:
      - minikube
    - key: beta.kubernetes.io/os
      operator: In
      values:
      - linux
  - matchExpressions:
    - key: another-node-label-key
      operator: Exists
  merge:
    labels:
      minikube: "true"
    annotations:
      node-labeler-operator: works
    taints:
    - key: dedicated
      value: foo
      effect: PreferNoSchedule

for more information about nodeSelectorTerms have a look at: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/

Cases

• VM on private cloud provider.
  Nodes are removed on shutdown and so lose theirs attributes.

Features

• Node selection
• Adding attributes
  • Labels
  • Annotations
  • Taints
• Removing attributes
• Overwrite attributes