Networking Model:

1. Pod-to-Pod Communication:

   • Every Pod gets a unique IP.

   • Pods can communicate with each other directly within the cluster.

2. Service Networking:

   • Services provide stable endpoints for accessing Pods.

3. DNS:

   • Kubernetes provides an internal DNS service to resolve Service names to their cluster IPs.

4. Ingress:

   • Manages external HTTP/S access to Services.

   • Example Ingress YAML manifest:

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

5. Network Policies:

   • Define rules for traffic flow between Pods.

   Example NetworkPolicy YAML manifest:

   apiVersion: networking.k8s.io/v1
   kind: NetworkPolicy
   metadata:
     name: allow-frontend
   spec:
     podSelector:
       matchLabels:
         app: frontend
     policyTypes:
     - Ingress
     ingress:
     - from:
       - podSelector:
           matchLabels:
             app: backend

Activity:

Deploy a sample Ingress resource to expose a Service externally. Test it by accessing the Service from a web browser or curl command.