I can't connect to pods in kubeernetes

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1

i have an application that record live traffic and replay them.

it is a simple app to use, but when i tried to use it with kubernetes i get a problem with connecting or communicating pods.

i created a pod with two containers, one is goreplay and the other is a simple python webserver. in this pod the goreplay will track the traffic coming from outside to the python server and will forward it to another python server which is in another pod.

here is the first deployment file :

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: goreplay-deployment
      labels:
            app: goreplay-app
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: goreplay-app
      template:
        metadata:
          labels:
            app: goreplay-app
        spec:
          containers:
          - name: goreplay
            image: feiznouri/goreplay:2.0
            args:
              - --input-raw
              - :3000
              - --output-http="http://service-server.default:3200"
            volumeMounts:
              - name: data
                mountPath: /var/lib/goreplay
          - name: myserver
            image: feiznouri/python-server:1.1
            args:
              - "3000"
            ports:
            - name: server-port
              containerPort: 3000
          volumes:
          - name: data
            persistentVolumeClaim:
              claimName: goreplay-claim

in the args section of the goreplay container i put the parametre , the output is one of them but i’m not sure what adress to put.

here is the service for the first deployment :

    apiVersion: v1
    kind: Service
    metadata:
      name: service-goreplay
    spec:
      selector:
        app: goreplay-app
      ports:
        - port: 31001
          nodePort: 31001
          targetPort: server-port
          protocol: TCP
      type: NodePort

and here is the second deploment which has only the second server :

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: server-deployment
      labels:
            app: server-app
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: server-app
      template:
        metadata:
          labels:
            app: server-app
        spec:
          containers:
          - name: myserver
            image: feiznouri/python-server:1.1
            args:
              - "3001"
            ports:
            - name: server-port
              containerPort: 3001

and here is it’s service :

    apiVersion: v1
    kind: Service
    metadata:
      name: service-server
    spec:
      selector:
        app: server-app
      ports:
        - port: 3200
          targetPort: server-port
          protocol: TCP

the problem is that , this way , i’m not getting the traffic to the second server, i am sending request from outside to the first server and i see the traffic coming to the first one , but there is nothing in the second server

What is the correct adress to put in the output parametre of the second server for this to work.

Cluster information:

Kubernetes version: v1.20.2
Installation method: binary
Host OS: ubuntu 20.04

2

A doc that covers how to debug service-related problems. Maybe this helps?

https://kubernetes.io/docs/tasks/debug-application-cluster/debug-service/