Creating Services and Ingress Resources

dns-demo.yaml

apiVersion: v1
kind: Service
metadata:
  name: dns-demo
spec:
  selector:
    name: dns-demo
  clusterIP: None
  ports:
  - name: dns-demo
    port: 1234
    targetPort: 1234
---
apiVersion: v1
kind: Pod
metadata:
  name: dns-demo-1
  labels:
    name: dns-demo
spec:
  hostname: dns-demo-1
  subdomain: dns-demo
  containers:
  - name: nginx
    image: nginx
---
apiVersion: v1
kind: Pod
metadata:
  name: dns-demo-2
  labels:
    name: dns-demo
spec:
  hostname: dns-demo-2
  subdomain: dns-demo
  containers:
  - name: nginx
    image: nginx

hello-ingress.yaml

apiVersion: app/v1
kind: Ingress
metadata:
  name: hello-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.global-static-ip-name: "global-ingress"
spec:
  rules:
  - http:
      Paths:
     - path: /v1
        backend:
          serviceName: hello-svc
          servicePort: 80
      - path: /v2
        backend:
          serviceName: hello-lb-svc
          servicePort: 80

hello-lb-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: hello-lb-svc
spec:
  type: LoadBalancer
  loadBalancerIP: 10.10.10.10
  selector:
    name: hello-v2
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080

hello-nodeport-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: hello-svc
spec:
  type: NodePort
  selector:
    name: hello-v1
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080
    nodePort: 30100

hello-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: hello-svc
spec:
  type: ClusterIP
  selector:
    name: hello-v1
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080

hello-v1.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-v1
spec:
  replicas: 3
  selector:
    matchLabels:
      run: hello-v1
  template:
    metadata:
      labels:
        run: hello-v1
        name: hello-v1
    spec:
      containers:
      - image: gcr.io/google-samples/hello-app:1.0
        name: hello-v1
        ports:
        - containerPort: 8080
          protocol: TCP

hello-v2.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-v2
spec:
  replicas: 3
  selector:
    matchLabels:
      run: hello-v2
  template:
    metadata:
      labels:
        run: hello-v2
        name: hello-v2
    spec:
      containers:
      - image: gcr.io/google-samples/hello-app:2.0
        name: hello-v2
        ports:
        - containerPort: 8080
          protocol: TCP

setup-env.sh

#preset
export my_zone=us-central1-a
export my_cluster=standard-cluster-1
source <(kubectl completion bash)
gcloud container clusters get-credentials $my_cluster --zone $my_zone
git clone https://github.com/GoogleCloudPlatform/training-data-analyst
ln -s ~/training-data-analyst/courses/ak8s/v1.1 ~/ak8s
cd ~/ak8s/GKE_Services/

#create resources and check the lb
kubectl apply -f dns-demo.yaml
kubectl get pods

kubectl exec -it dns-demo-1 -- /bin/bash
apt-get update
apt-get install -y iputils-ping
ping dns-demo-2.dns-demo.default.svc.cluster.local
ping dns-demo.default.svc.cluster.local

#deploy a sample workload and a ClusterIP service
kubectl apply -f ./hello-svc.yaml
kubectl get service hello-svc

#deploy a new set of Pods and a LoadBalancer service
kubectl create -f hello-v2.yaml
kubectl get deployments

export STATIC_LB=$(gcloud compute addresses describe regional-loadbalancer --region us-central1 --format json | jq -r '.address')
cat hello-lb-svc.yaml
kubectl apply -f ./hello-lb-svc.yaml
sed -i "s/10\.10\.10\.10/$STATIC_LB/g" hello-lb-svc.yaml

#deploy an Ingress resource