Unable to GET in K8s WSL2

I have two Kubernetes pods, running under Docker Desktop in WSL2 (local dev test PC). One pod contains a web app and the other a REST API.

I can successfully login a user in the browser, and the REST API’s logs show that the POST request at http://restapi-service:8080/User was accepted.

However, when I then try to send a GET request to http://restapi-service:8080/Job/jobs?userId=3, I’m getting a “net::ERR_NAME_NOT_RESOLVED” error.

I have verified that the same GET request is working fine when not running in Kubernetes.

It seems to be also working when testing with wget from the web app pod:

$ wget http://restapi-service:8080/Job/jobs?userId=3
Connecting to restapi-service:8080 (10.100.127.206:8080)
saving to 'jobs?userId=3'
jobs?userId=3        100% |******************************************************************************************************************************************|  1809  0:00:00 ETA
'jobs?userId=3' saved

I also tried with the fully qualified domain name restapi-service.default.svc.cluster.local but it made no difference.

Services descriptions:

$ kubectl describe service webui
Name:                     webui-service
Namespace:                default
Labels:                   <none>
Annotations:              <none>
Selector:                 app=webui
Type:                     NodePort
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.104.148.120
IPs:                      10.104.148.120
Port:                     http  80/TCP
TargetPort:               5173/TCP
NodePort:                 http  32000/TCP
Endpoints:                10.1.0.95:5173
Session Affinity:         None
External Traffic Policy:  Cluster
Internal Traffic Policy:  Cluster
Events:                   <none>

$ kubectl describe service restapi
Name:                     restapi-service
Namespace:                default
Labels:                   <none>
Annotations:              <none>
Selector:                 app=restapi
Type:                     ClusterIP
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.100.127.206
IPs:                      10.100.127.206
Port:                     8080  8080/TCP
TargetPort:               8080/TCP
Endpoints:                10.1.0.92:8080
Port:                     8081  8081/TCP
TargetPort:               8081/TCP
Endpoints:                10.1.0.92:8081
Session Affinity:         None
Internal Traffic Policy:  Cluster
Events:                   <none>

Any help would be greatly appreciated!

I managed to solve this myself. In case anyone else is having the same issue with Docker Desktop/WSL2/Kubernetes, here is what worked for me:

Web app service YAML:

apiVersion: v1
kind: Service
metadata:
  name: webapp-service
  namespace: default
spec:
  type: NodePort
  selector:
    app: webapp
  ports:
    - name: web
      protocol: TCP
      port: 80
      targetPort: 5173
      nodePort: 30080

Rest API service YAML:

apiVersion: v1
kind: Service
metadata:
  name: api-service
  namespace: default
spec:
  type: NodePort
  selector:
    app: api
  ports:
    - name: restapi
      protocol: TCP
      port: 8080
      targetPort: 8080
      nodePort: 30081

Get the WSL IP by running:

ip addr show eth0 | grep inet

Then use that IP with the node port of the API in the fetch command, E.g.:

fetch(http://172.23.233.198:30081/Job/jobs?userId=3)