pods-2-nodes.md

Assigning pods to nodes

Walkthrough

# leave n3 as is 
kubectl label nodes n7 rechenzentrum=rz1
kubectl label nodes n17 rechenzentrum=rz2
kubectl label nodes n27 rechenzentrum=rz2

kubectl get nodes --show-labels

# nginx-deployment 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 9 # tells deployment to run 2 pods matching the template
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
      nodeSelector:
        rechenzentrum: rz2

# Let's rewrite that to deployment 
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: test
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  nodeSelector:
    rechenzentrum=rz2

Ref:

• https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/