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Docker – 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!

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2

Answers


  1. 0

    The simplest hack to get your local dev setup working is to force your OS to resolve the container names back to localhost.

    sounds like you’re on windows. temporarily edit c:windowssystem32driversetchosts

    with

    127.0.0.1  restapi-service
127.0.0.1  webui-service

    you could even shim / extend a slightly more useful setup using something like dnsmasq to catch a hostname glob pattern.

    The other comments present a myriad of options suited to non local dev environments.

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  2. 0

    Your post request is simple:

    http://restapi-service:8080/User

    However your get request has additional things in it:

    http://restapi-service:8080/Job/jobs?userId=3

    So, if you configured ingress to run for http://restapi-service:8080/User you should also configure it to run for http://restapi-service:8080/Job.

    A better way would be to have the same request pattern:

    http://restapi-service:8080/<your app name here>/.*

    In case you specify /.* allow regex by adding:

    nginx.ingress.kubernetes.io/use-regex: "true"
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