how to connect 2 webapps in 2 nodeport service? - kubernetes

Question

I have a single node k8s cluster with 2 web applications running on 2 NGINX k8s pods.
nginx-deployment1 --> WEBAPP1 --> nginx-svc-app1 --> <K8s_controler_IP>:30080/webapp1
nginx-deployment2 --> WEBAPP2 --> nginx-svc-app2 --> <K8s_controler_IP>:30081/webapp2
Its connecting only to the respective nodeport ip but not connecting to <K8s_controler_IP>:30080/webapp1 and <K8s_controler_IP>:30081/webapp2. Could you please help me understand what am i missing?
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment1
labels:
name: nginx-app1
spec:
replicas: 3
selector:
matchLabels:
name: nginx-app1
template:
metadata:
labels:
name: nginx-app1
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-svc-app1
labels:
name: nginx-svc-app1
spec:
type: NodePort
ports:
- port: 80
nodePort: 30080
name: app1_port
selector:
name: nginx-app1
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment2
labels:
name: nginx-app2
spec:
replicas: 3
selector:
matchLabels:
name: nginx-app2
template:
metadata:
labels:
name: nginx-app2
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-svc-app2
labels:
name: nginx-svc-app2
spec:
type: NodePort
ports:
- port: 80
nodePort: 30081
name: http
selector:
name: nginx-app2

Answer 1

Your port configurations are incorrect. You need to set targetPort: 80 for both services. When you use the NodePort service type and specify the NodePort, the port field is irrelevant. That is the port that typically receives the incoming traffic for the service endpoint. So, specifying both would mean:
Receive incoming traffic on an endpoint with port 80.
Receive incoming traffic to Node port 30080.
And you are not specifying a targetPort which is the port that receives the traffic in the pods of the deployment. So, the traffic is coming in, but not being forwarded anywhere.
You need to add targetPort: 80 to both services and remove the port parameter.
Additionally, you're not running 2 pods, but you are running 2 deployments, each with 3 pods (replicas) in them. And the traffic you will send to each service, will be 'distributed' by the service, on all the pods that will match the selector - i.e. all 3 of your pods. It's important to understand how the communication takes place.
Also, k8s_controller_ip is an incorrect way of describing the IP address. You should use the term k8s Node IP or k8s_master_node_ip. The IP address belongs to the node that is running the cluster, not to any controller.