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Kubernetes

kubectl port-forward Limitation

kubectl port-forward pod/mypod 8080:80

kubectl port-forward creates a connection from the local machine [8080] and to a pod [80] in the cluster. It binds to 172.0.0.1 (localhost) by default. Which means, we can't access it in another machine even in the subnet.

We have 2 options to resolve this.

  1. Modify the address of port-forward command.

    kubectl port-forward --address 0.0.0.0 pod/mypod 8080:80

  2. Create a service instead.

    apiVersion: v1
kind: Service
metadata:
    name: mealie
    namespace: mealie
spec:
    selector:
        app: mealie
    type: NodePort
    ports:
        - protocol: TCP
          port: 80 # Service port
          targetPort: 9000 # Pod's containerPort
          nodePort: 32000 # Optional: Specify a NodePort (otherwise, Kubernetes will assign one dynamically)

Use kubectl get svc to figure out which port is assigned to which service.

References: