Node-red Kubernetes Deployment - kubernetes

Question

I am trying to deploy a simple node-red container on kubernetes locally to monitor its usage and at the same time create a persistent volume storage so that my node red work is saved. However, I can't get it to deploy to kubernetes. I have created a Deployment.yaml file with the following code
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nodered
name: nodered
spec:
replicas: 1
selector:
matchLabels:
app: nodered
template:
metadata:
labels:
app: nodered
spec:
containers:
- name: nodered
image: nodered/node-red:latest
limits:
memory: 512Mi
cpu: "1"
requests:
memory: 256Mi
cpu: "0.2"
ports:
- containerPort: 1880
volumeMounts:
- name: nodered-claim
mountPath: /data/nodered
# subPath: nodered <-- not needed in your case
volumes:
- name: nodered-claim
persistentVolumeClaim:
claimName: nodered-claim
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: small-pv
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: local-storage
local:
path: /data
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- minikube
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nodered-claim
spec:
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:enter image description here
storage: 1Gi
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate
I am getting this error in powershell:
kubectl apply -f ./Deployment.yaml
persistentvolume/small-pv unchanged
persistentvolumeclaim/nodered-claim unchanged
storageclass.storage.k8s.io/local-storage unchanged
Error from server (BadRequest): error when creating "./Deployment.yaml": Deployment in version "v1" cannot be handled as a Deployment: strict decoding error: unknown field "spec.template.spec.containers[0].cpu", unknown field "spec.template.spec.containers[0].limits", unknown field "spec.template.spec.containers[0].memory", unknown field "spec.template.spec.requests"
I want it to deploy to kubernetes so that I can monitor the memory usage of the node red container

Answer 1

The requests & limits sections needs to be under a resources heading as follows:
spec:
containers:
- name: nodered
image: nodered/node-red:latest
resources:
limits:
memory: 512Mi
cpu: "1"
requests:
memory: 256Mi
cpu: "0.2"
ports:
- containerPort: 1880
volumeMounts:
- name: nodered-claim
mountPath: /data/nodered
# subPath: nodered <-- not needed in your case

Answer 2

Node-Red because of its base platform(Node-JS) is entirely single threaded. Even if you put this on kubernetes with huge number of pods, somewhere down the road the whole app will be blocked at CPU limit of one of the POD.
Both vertical and horizontal scaling is infeasible.
If you load is heavy, use a proper middleware.

Answer 3

Your deployment was syntax error. Let's fix it to the right syntax
It should be like this:
containers:
- name: nodered
image: nodered/node-red:latest
resources:
requests:
memory: "256Mi"
cpu: "0.2"
limits:
memory: "512Mi"
cpu: "1"