Question 38280 in Ubuntu Question posted in
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port forwarding on microk8s on mac m1 – Ubuntu

I’m freshman on microk8s, and I’m trying out things by deploying a simple apache2 to see things working on my Mac M1:

◼ ~ $ microk8s kubectl run apache --image=ubuntu/apache2:2.4-22.04_beta --port=80
pod/apache created
◼ ~ $ microk8s kubectl get pods
NAME                                   READY   STATUS             RESTARTS       AGE
apache                                 1/1     Running            0              5m37s
◼ ~ $ microk8s kubectl port-forward pod/apache 3000:80
Forwarding from 127.0.0.1:3000 -> 80

but:

◼ ~ $ curl http://localhost:3000
curl: (7) Failed to connect to localhost port 3000 after 5 ms: Connection refused

I’ve also tried to use a service:

◼ ~ $ microk8s kubectl expose pod apache --type=NodePort  --port=4000 --target-port=80
service/apache exposed
◼ ~ $ curl http://localhost:4000
curl: (7) Failed to connect to localhost port 4000 after 3 ms: Connection refused

I guess I’m doing something wrong?

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3

Answers


  1. Chosen as BEST ANSWER
    0

    For some reason I haven't figured it out, if I port-forward right within the VM by opening a shell via multipass, it does work. Next, you simply have to point to the VM's IP:

    within a VM's shell:

    ubuntu@microk8s-vm:~$ sudo microk8s kubectl port-forward service/hellopg 8080:8080 --address="0.0.0.0"
Forwarding from 0.0.0.0:8080 -> 8080
Handling connection for 8080

ubuntu@microk8s-vm:~$ ifconfig enp0s1
enp0s1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.64.2  netmask 255.255.255.0  broadcast 192.168.64.255
        inet6 fde3:1a04:ba31:1209:5054:ff:fea9:9cf4  prefixlen 64  scopeid 0x0<global>

    from the host:

     curl http://192.168.64.2:8080/hello                                                                                                                                                                                                                   7
{"status": "how you doing?", "env_var":"¡hola mundo!"}

    it works. I guess the command via microk8s is not executed properly within the machine? If anybody can explain this I'll update the question


  2. 0

    Microk8’s acts the same as kuberentes. So, it’s better to create a Service with NodePort. This would expose your apache.

    apiVersion: v1
kind: Service
metadata:
  name: my-apache
spec:
  type: NodePort
  selector:
    app: apache
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30004

    Change the selector as per your requirement. For more detailed information to create NodePort service refer to this official document
    You can use ingress as well. But in your case only for testing you can go with NodePort

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  3. 0

    I think the easiest way for you to test it would be adding: externalIPs to you service.

    kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
    - name: http
      protocol: TCP
      port: 80
      targetPort: 80
  externalIPs:
    - 192.168.56.100 #your cluster IP

    Happy coding!

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