Kubernetes Pod unable to communicate with another Pod using a Service - kubernetes

Question

I have 2 Pods with 1 container each. The container names are:
mc1
mc2
mc1 container hosts an asp.net core razor pages app while mc2 hosts a web api app. Now mc1 has to communicate with mc2 i.e. razor page app has to call web api app.
I have tried to explain it in the below image:
I created 2 deployments for these 2 pods:
name: dep1
labels:
app: mc-app1
spec:
replicas: 1
selector:
matchLabels:
app: mc-app1
template:
metadata:
labels:
app: mc-app1
spec:
containers:
- name: mc1
image: multiapp
imagePullPolicy: Never
ports:
- containerPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: dep2
labels:
app: mc-app2
spec:
replicas: 1
selector:
matchLabels:
app: mc-app2
template:
metadata:
labels:
app: mc-app2
spec:
containers:
- name: mc2
image: multiapi
imagePullPolicy: Never
ports:
- containerPort: 80
I also created a service for the POD containing the mc2 container (i.e. web api app).
apiVersion: v1
kind: Service
metadata:
name: multi-container-service-2
spec:
type: NodePort
selector:
app: mc-app2
ports:
- port: 8080
targetPort: 80
The deployments and services are successfully applied to the k8s cluster.
Next, I am entering the container "mc1" and trying to curl the service called multi-container-service-2 but this is not working.
I am getting error:
curl: (7) Failed to connect to multi-container-service-2 port 80: Connection refused
In the below image I am entering the shell of the container mc1 with the command:
kubectl exec -it dep1-5c78b8c889-tjzzr -c mc1 -- /bin/bash
In the next image I am doing the curl which is giving error:
Note that I have already installed curl using the 2 commands given below:
apt-get update
apt-get install curl
Why can't the app in mc2 container be called using the service? My Operating system is windows 10.
I am taking the help of these 2 tutorials:
Build ASP.NET Core applications deployed as Linux containers into an AKS/Kubernetes orchestrator
Communicate Between Containers in the Same Pod Using a Shared Volume

Answer 1

You have set to service port to 8080, but you are calling the service on port 80 (which is the container's port).
This should work:
curl http://multi-container-service-2:8080

Answer 2

As stated in the official kubernetes documentation:
Kubernetes creates DNS records for services and pods. You can contact services with consistent DNS names instead of IP addresses.
In order to communicate Pod-to-Pod through a service in your cluster you have to use the following syntax :
{service_name}.{namespace}.svc.cluster.local
So in your case, with curl it would be :
curl multi-container-service-2.default.svc.cluster.local