node-red-contrib-kubernetes-client

A Node-RED node that supports interacting with Kubernetes API via watches and HTTP requests.

GitHub

Install

npm install --save node-red-contrib-kubernetes-client

Documentation

The nodes are properly documented in Node-RED itself. In short there are 2 nodes:

• kubernetes-client-watch - produces messages for configured watch endpoints.
• kubernetes-client-http - allows complete interaction with Kubernetes API via ALL HTTP endpoints and verbs etc.

Watches ouput a msg.payload with the following structure (as a json object in Node-RED but shared here as yaml for readability):

# example event
---
type: ADDED || MODIFIED || DELETED || ERROR
object:
  kind: ...
  apiVersion: ...
  metadata:
    ...
  ...

# example error
---
type: ERROR
object:
  kind: Status
  apiVersion: v1
  metadata: {}
  status: Failure
  message: 'too old resource version: 1 (78390381)'
  reason: Gone
  code: 410

msg.payload.object contains the full resource from Kubernetes.

Development

Some helpful command variants for testing/developing:

# show event output structure
kubectl -v6 get nodes --watch --output-watch-events -o yaml

# manually specify URL
kubectl -v6 get --raw '/api/v1/nodes?resourceVersion=1&watch=true'

# watch response error structure
---
type: ERROR
object:
  kind: Status
  apiVersion: v1
  metadata: {}
  status: Failure
  message: 'too old resource version: 1 (78383979)'
  reason: Gone
  code: 410

License

See license (MIT).