k8s-ingress-example

How to Use Nginx Ingress Controller 

Creating a Kubernetes Ingress
First, let’s create two services to demonstrate how the Ingress routes our request. We’ll run two web applications that output a slightly different response.

vi apple.yaml

kind: Pod
apiVersion: v1
metadata:
  name: apple-app
  labels:
    app: apple
spec:
  containers:
    - name: apple-app
      image: hashicorp/http-echo
      args:
        - "-text=apple"

---

kind: Service
apiVersion: v1
metadata:
  name: apple-service
spec:
  selector:
    app: apple
  ports:
    - port: 5678 # Default port for image
    
    
    
    
vi banana.yaml
    
kind: Pod
apiVersion: v1
metadata:
  name: banana-app
  labels:
    app: banana
spec:
  containers:
    - name: banana-app
      image: hashicorp/http-echo
      args:
        - "-text=banana"

---

kind: Service
apiVersion: v1
metadata:
  name: banana-service
spec:
  selector:
    app: banana
  ports:
    - port: 5678 # Default port for image 
    
    
###    Create the resources

kubectl apply -f apple.yaml
kubectl apply -f banana.yaml


## Now, declare an Ingress to route requests to /apple to the first service, and requests to /banana to second service.
## Check out the Ingress’ rules field that declares how requests are passed along.

vi ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  rules:
  - host: example.com
    http:
      paths:
      - path: /apple
        pathType: Prefix
        backend:
          service:
            name: apple-service
            port:
              number: 5678
      - path: /banana
        pathType: Prefix
        backend:
          service:
            name: banana-service
            port:
              number: 5678
              
  ## Create the Ingress in the cluster
  
  kubectl create -f ingress.yaml
  
[root@master-node kuberntes-nginx-controller]# k get svc -n ingress-nginx
NAME            TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   LoadBalancer   10.102.93.210   <pending>     80:32435/TCP,443:32454/TCP   64m
 
[root@master-node kuberntes-nginx-controller]# vi /etc/hosts
[root@master-node kuberntes-nginx-controller]# curl -kL http://example.com/apple
apple
 
[root@master-node kuberntes-nginx-controller]# curl -kL http://example.com/banana
banana

 [root@master-node kuberntes-nginx-controller]# curl -k example.com:32435/apple
apple
[root@master-node kuberntes-nginx-controller]# curl -k example.com:32435/banana
banana