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04-ingress-nginx-with-hostnames.md

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Ingress Nginx

Prerequisits

# Ingress Controller muss aktiviert sein 
## Nur der Fall wenn man microk8s zum Einrichten verwendet 
## Ubuntu 
microk8s enable ingress

Walkthrough

Step 1: pods and services

cd
mkdir -p manifests
cd manifests 
mkdir abi
cd abi

# apple.yml 
# vi apple.yml 
kind: Pod
apiVersion: v1
metadata:
  name: apple-app
  labels:
    app: apple
spec:
  containers:
    - name: apple-app
      image: hashicorp/http-echo
      args:
        - "-text=apple-<dein-name>"
---

kind: Service
apiVersion: v1
metadata:
  name: apple-service
spec:
  selector:
    app: apple
  ports:
    - protocol: TCP
      port: 80
      targetPort: 5678 # Default port for image

kubectl apply -f apple.yml 

# banana
# vi banana.yml
kind: Pod
apiVersion: v1
metadata:
  name: banana-app
  labels:
    app: banana
spec:
  containers:
    - name: banana-app
      image: hashicorp/http-echo
      args:
        - "-text=banana-<dein-name>"

---

kind: Service
apiVersion: v1
metadata:
  name: banana-service
spec:
  selector:
    app: banana
  ports:
    - port: 80
      targetPort: 5678 # Default port for image

kubectl apply -f banana.yml

Step 2: Ingress

# Ingress
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: example-ingress
  annotations:
    ingress.kubernetes.io/rewrite-target: /
    # with the ingress controller from helm, you need to set an annotation 
    # otherwice it does not know, which controller to use
    # old version... use ingressClassName instead 
    # kubernetes.io/ingress.class: nginx
spec:
  ingressClassName: nginx
  rules:
  - host: "<euername>.lab<nr>.t3isp.de"
    http:
      paths:
        - path: /apple
          backend:
            serviceName: apple-service
            servicePort: 80
        - path: /banana
          backend:
            serviceName: banana-service
            servicePort: 80

# ingress 
kubectl apply -f ingress.yml
kubectl get ing

Reference

Find the problem

# Hints 

# 1. Which resources does our version of kubectl support 
# Can we find Ingress as "Kind" here.
kubectl api-ressources 

# 2. Let's see, how the configuration works 
kubectl explain --api-version=networking.k8s.io/v1 ingress.spec.rules.http.paths.backend.service

# now we can adjust our config

Solution

# in kubernetes 1.22.2 - ingress.yml needs to be modified like so.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-ingress
  annotations:
    ingress.kubernetes.io/rewrite-target: /
    # with the ingress controller from helm, you need to set an annotation 
    # old version useClassName instead 
    # otherwice it does not know, which controller to use
    # kubernetes.io/ingress.class: nginx 
spec:
  ingressClassName: nginx
  rules:
  - host: "app12.lab.t3isp.de"
    http:
      paths:
        - path: /apple
          pathType: Prefix
          backend:
            service:
              name: apple-service
              port:
                number: 80
        - path: /banana
          pathType: Prefix
          backend:
            service:
              name: banana-service
              port:
                number: 80