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Pregunta 2 - Programación de Pod en Control Plane

Question 2 | Schedule Pod on Controlplane Nodes​

Use context: kubectl config use-context k8s-c1-H

Create a single Pod of image httpd:2.4.41-alpine in Namespace default. The Pod should be named pod1 and the container should be named pod1-container. This Pod should only be scheduled on controlplane nodes. Do not add new labels to any nodes.

Vamos a verificar los taints

k get node # encuentra el nodo controlplane

k describe node cluster1-controlplane1 | grep Taint -A1 # obtiene los taints del nodo controlplane
k get node cluster1-controlplane1 --show-labels # obtiene las etiquetas del nodo controlplane

# Creando una plantilla para el pod para aplicarla después
k run pod1 --image=httpd:2.4.41-alpine --dry-run=client -o yaml > 2.yaml
vim 2.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: pod1
  name: pod1
spec:
  containers:
  - image: httpd:2.4.41-alpine
    name: pod1-container                       # cambiar
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
  tolerations:                                 # agregar
  - effect: NoSchedule                         # agregar
    key: node-role.kubernetes.io/control-plane # agregar
  nodeSelector:                                # agregar
    node-role.kubernetes.io/control-plane: ""  # agregar
status: {}

La toleration es necesaria, de lo contrario, incluso si seleccionamos el nodo control plane, no se ejecutará.

k -f 2.yaml create
k get pod pod1 -o wide

NAME   READY   STATUS    RESTARTS   ...    NODE                     NOMINATED NODE
pod1   1/1     Running   0          ...    cluster1-controlplane1   <none>