Ingress Allow Access Only From Certain IP Addresses

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:alpine
          ports:
            - name: nginx
              containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  type: ClusterIP
  selector:
    app: nginx
  ports:
    - name: nginx
      protocol: TCP
      port: 80
      targetPort: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx
  annotations:
    # https://medium.com/@maninder.bindra/using-nginx-ingress-controller-to-restrict-access-by-ip-ip-whitelisting-for-a-service-deployed-to-bd5c86dc66d6
    # nginx.ingress.kubernetes.io/whitelist-source-range: 168.140.34.181/32
    # https://blog.container-solutions.com/kubernetes-quick-tip
    # ingress.kubernetes.io/whitelist-source-range: 168.140.34.181/32
    # https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#whitelist-source-range
    nginx.ingress.kubernetes.io/whitelist-source-range: 168.140.34.181/32
spec:
  rules:
    - host: nginx.mac-blog.org.ua
      http:
        paths:
          - backend:
              service:
                name: nginx
                port:
                  number: 80
            path: /
            pathType: ImplementationSpecific