Pod unable to communicate with out of cluster

Question

We have created a cluster with kubenet network. Pod is not able to communicate with out side of cluster resource like Kafka. We have opened enough firewall and configured routable for aks VNET and kafka Vnet. We tested the connectivity using telnet from one of VMSS to Kafka server, its working.

Answer 1

Hello adm-TAMEYYAR Best practices says that if you would like to connect external services like DBs, Queues, etc you need to use Endpoints and Services.
This way the connectivity is being managed by Kubernetes. Here is an example:

    ---
    kind: "Service"
    apiVersion: "v1"
    metadata:
      name: "kafka"
    spec:
      ports:
        -
          name: "kafka"
          protocol: "TCP"
          port: 9092
          targetPort: 9092
          nodePort: 0
    ---
    kind: "Endpoints"
    apiVersion: "v1"
    metadata:
      name: "kafka"
    subsets:
      -
        addresses:
          -
            ip: "10.128.0.2"
        ports:
          -
            port: 9092
            name: "kafka"

https://stackoverflow.com/questions/50595162/kubernetes-node-cant-reach-external-kafka-cluster