Cheatsheet 10 - Nodes und Pods

Befehl	Aktion
kubectl label node <node_name> <key>=<value>	Label erstellen
kubectl taint node <node_name> <key>=<value>:<effect>	Taint erstellen
kubectl taint node <node_name> <key>:<effect>-	Taint entfernen

Node-Selector Beispiel:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: nginx
    image: nginx
  nodeSelector:
    my-key: my-value

Node-Affinity Beispiel:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: nginx
    image: nginx
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/e2e-az-name
            operator: In
            values:
            - us-west-1a
            - us-west-1b

Pod-(Anti-)Affinity Beispiel:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: nginx
    image: nginx
  affinity:
    podAffinity: # Oder podAntiAffinity
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values:
            - db
        topologyKey: "kubernetes.io/hostname"

Toleration Beispiel:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: nginx
    image: nginx
  tolerations:
  - key: "node-type"
    operator: "Equal"
    value: "gpu"
    effect: "NoSchedule"

Request und Limits Beispiel

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: nginx
    image: nginx
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"