24-INGRESS.md

How to create kubectl alias (optional):

• alias k=kubectl
• alias kdr='kubectl -o yaml --dry-run=client'

Install Nginx Ingress Controller Steps:

• ConfigMap
  • kdr create configmap nginx-configuration -n ingress-space > configmap.yml
• ServiceAccount
  • kdr create sa ingress-serviceaccount -n ingress-space > sa.yml

Nginx Ingress Controller:

apiVersion: v1
kind: ConfigMap
metadata:
  name: ingress-nginx-controller  
---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ingress-nginx-controller
spec:
  selector:
    matchLabels:
      name: nginx-ingress-controller
  template:
    metadata:
      labels:
        name: nginx-ingress-controller
    spec:
      dnsPolicy: ClusterFirst
      containers:
        - name: nginx-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.21.0
          imagePullPolicy: IfNotPresent
          args:
            - /nginx-ingress-controller
            - --publish-service=$(POD_NAMESPACE)/
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
          - name: http
            containerPort: 80
            protocol: TCP
          - name: https
            containerPort: 443
            protocol: TCP

---

apiVersion: v1
kind: Service
metadata:
  namespace: ingress-nginx
spec:
  type: NodePort
  ports:
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx-ingress-controller

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: ingress-nginx-admission

Create it:

• k apply -f nginx-ingress-definition.yml

Ingress Example:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  rules:
  - host: mydomain.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: backend1
            port:
              number: 80

      - host: mydomain2.com
        path: /
        pathType: Prefix
        backend:
          service:
            name: backend2
            port:
              number: 80