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Exploring Virtual Clusters

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Sumit Rawal answered on June 23, 2023 Popularity 1/10 Helpfulness 1/10

answer Exploring Virtual Clusters

Exploring Virtual Clusters

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Seeking for system-level objects

The virtual clusters

The default namespace

Try it yourself

Seeking for system-level objects

Almost all of the system services are running as Kubernetes objects. Kube DNS is used for deployments. Dashboard, Storage Controller, and nginx Ingress are a few of the system Pods that are currently running in our k3d cluster.

Still, we haven’t seen them yet. Even though we executed kubectl get all quite a few times, there was not a trace of any of those objects. How can that be? Will we see them now if we list all the objects?

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: go-demo-2
  annotations:
    kubernetes.io/ingress.class: "nginx"
    ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
spec:
  rules:
  - host: go-demo-2.com
    http:
      paths:
      - path: /demo
        pathType: ImplementationSpecific
        backend:
          service:
            name: go-demo-2-api
            port:
              number: 8080

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: go-demo-2-db
spec:
  selector:
    matchLabels:
      type: db
      service: go-demo-2
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        type: db
        service: go-demo-2
        vendor: MongoLabs
    spec:
      containers:
      - name: db
        image: mongo:3.3

---

apiVersion: v1
kind: Service
metadata:
  name: go-demo-2-db
spec:
  ports:
  - port: 27017
  selector:
    type: db
    service: go-demo-2

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: go-demo-2-api
spec:
  replicas: 3
  selector:
    matchLabels:
      type: api
      service: go-demo-2
  template:
    metadata:
      labels:
        type: api
        service: go-demo-2
        language: go
    spec:
      containers:
      - name: api
        image: vfarcic/go-demo-2
        env:
        - name: DB
          value: go-demo-2-db
        readinessProbe:
          httpGet:
            path: /demo/hello
            port: 8080
          periodSeconds: 1
        livenessProbe:
          httpGet:
            path: /demo/hello
            port: 8080

---

apiVersion: v1
kind: Service
metadata:
  name: go-demo-2-api
spec:
  ports:
  - port: 8080
  selector:
    type: api
    service: go-demo-2

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Source: Grepper

Tags: virtual whatever

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Contributed on Jun 23 2023

Sumit Rawal

0 Answers Avg Quality 2/10

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