Pregunta 21 - Crear Static Pod y Service

Question 21 | Create a Static Pod and Service

Use context: kubectl config use-context k8s-c3-CCC

Create a Static Pod named my-static-pod in Namespace default on cluster3-controlplane1. It should be of image nginx:1.16-alpine and have resource requests for 10m CPU and 20Mi memory.

Then create a NodePort Service named static-pod-service which exposes that static Pod on port 80 and check if it has Endpoints and if it's reachable through the cluster3-controlplane1 internal IP address. You can connect to the internal node IPs from your main terminal.

---

ssh cluster3-controlplane1

root@cluster1-controlplane1:~# cd /etc/kubernetes/manifests/
root@cluster1-controlplane1:~# kubectl run my-static-pod --image=nginx:1.16-alpine -o yaml --dry-run=client > my-static-pod.yaml

vim my-static-pod.yaml

Vamos a editar este archivo... para adicionar el resource request

# my-static-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: my-static-pod
  name: my-static-pod
spec:
  containers:
  - image: nginx:1.16-alpine
    name: my-static-pod
    resources:                  # agregar
      requests:                 # agregar
        cpu: 10m                # agregar
        memory: 20Mi            # agregar
  dnsPolicy: ClusterFirst
  restartPolicy: Always
status: {}

Vamos a verificar si está ejecutándose.

k get pod -A | grep my-static
NAMESPACE     NAME                                   READY   STATUS   ...   AGE
default       my-static-pod-cluster3-controlplane1   1/1     Running  ...   22s

# creando el service
k expose pod my-static-pod-cluster3-controlplane1 --name static-pod-service --type=NodePort --port 80

# verificando
k get svc,ep -l run=my-static-pod

NAME                         TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
service/static-pod-service   NodePort   10.99.168.252   <none>        80:30352/TCP   30s
NAME                           ENDPOINTS      AGE
endpoints/static-pod-service   10.32.0.4:80   30s
Looking good.