I have a pod running a Flask app in python, which is listening in port 8083. If I access the app from inside the pod, it works:

    kubectl exec gen-759dcfd789-hscbr -c gen-pod -- curl http://localhost:8083

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
[...]

But when I look for the pod IP

kubectl describe pod gen-759dcfd789-hscbr

Name:         gen-759dcfd789-hscbr
Namespace:    default
Priority:     0
Node:         [...]
Start Time:   Wed, 15 Apr 2020 19:18:12 +0200
Labels:       app=gen
              pod-template-hash=759dcfd789
Annotations:  <none>
Status:       Running
IP:           10.1.45.187
IPs:
  IP:           10.1.45.187
Controlled By:  ReplicaSet/gen-759dcfd789

And try to access it from outside the pod

curl http://10.1.45.187:8083
curl: (7) Failed to connect to 10.1.45.187 port 8083: Conexión rehusada

It can't connect.

I have done the same with other apps running in nodejs, and they work correctly. What can be happening here? How can I debug why it isn't connecting? Thanks in advance.

I'm leaving the yaml here:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: gen
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: gen
  template:
    metadata:
      labels:
        app: gen
    spec:
      containers:
        - name: gen-pod
          image: roxax19/python3.7:0.1
          command:
            - bash
            - "-c"
            - python3.7 gen.py
          volumeMounts:
            - mountPath: /mount
              name: test-volume
      volumes:
        - name: test-volume
          hostPath:
            # directory location on host
            path: /home/manuel/tfg/mounts/gen
            # this field is optional
            type: Directory