commands.md

=== Create and deploy a Pod ===

vi pod.yml

apiVersion: v1
kind: Pod
metadata:
  name: hello-pod
  labels:
    app: web
    zone: prod
    version: v1
spec:
  containers:
  - name: hello-ctr
    image: nigelpoulton/k8sbook:latest
    ports:
    - containerPort: 8080

kubectl apply -f pod.yml kubectl get pods kubectl describe pods hello-pod

=== Create and deploy a Service ===

vi svc.yml

apiVersion: v1
kind: Service
metadata:
  name: svc-np
  labels:
    app: web
spec:
  type: NodePort
  ports:
    - port: 8080
      nodePort: 30001
  selector:
    app: web

kubectl apply -f svc.yml kubectl get svc kubectl describe svc svc-np curl localhost:30001

=== Terminate a node ===

kubectl get pods -o wide

Terminate the node that the Pod is running on

Refresh browser or run curl again

Create new node and add it to the cluster

Clean-up the lab by deleting the Pod

=== Create and deploy and Deployment ===

vi deploy.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
  labels:
    app: web
    zone: prod
    version: v1
spec:
  selector:
    matchLabels:
      app: web
  replicas: 1
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: web
        zone: prod
        version: v1
    spec:
      containers:
      - image: nigelpoulton/k8sbook:latest
        name: web-ctr
        ports:
        - containerPort: 8080

kubectl apply -f deploy.yml kubectl get pods kubectl get deploy -o wide kubectl describe deploy web curl localhost:30001

=== Demonstrate self-healing ===

kubectl get pods kubectl delete pod kubectl get pods curl localhost:30001 OR refresh browser

=== Demonstrate scaling ===

EDIT deploy.yml and change to 8 replicas

vi deploy.yml Change replica count to 8

kubectl apply -f deploy.yml kubectl get deploy web --watch kubectl get pods --watch kubectl get pods -o wide

Change replica count back to 6

=== Provision and use a cloud load-balancer ===

vi svc-lb.yml

apiVersion: v1
kind: Service
metadata:
  name: svc-lb
  labels:
    app: web
spec:
  type: LoadBalancer
  ports:
    - port: 8080
      targetPort: 8080
  selector:
    app: web

kubectl apply -f svc-lb.yml kubectl get svc svc-lb --watch Connect to LoadBalancer URL shown in the command above

=== Demonstrate a rolling update ===

vi deploy.yml Change image used to edge tag

kubectl apply -f deploy.yml --record kubectl rollout status deployment web

Re-run curl or refresh browser