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kuberneteskubectl

Kubectl wait for service to get external ip

I'm trying to use kubectl to wait for a service to get an external ip assigned. I've been trying to use the below just to get started

kubectl wait --for='jsonpath={.spec.externalTrafficPolicy==Cluster}' --timeout=30s --namespace cloud-endpoints svc/esp-echo

But I keep getting the below error message

error: unrecognized condition: "jsonpath={.spec.externalTrafficPolicy==Cluster}"
Solution

  • It is not possible to pass arbitrary jsonpath and there is already a request for the feature.

    However, you can use a bash script with some sleep and monitor the service using other kubectl commands:

    kubectl get --namespace cloud-endpoints svc/esp-echo --template="{{range .status.loadBalancer.ingress}}{{.ip}}{{end}}"

    The above command will return the external IP for the LoadBalancer service for example.

    You can write a simple bash file using the above as:

    #!/bin/bash
ip=""
while [ -z $ip ]; do
  echo "Waiting for external IP"
  ip=$(kubectl get svc $1 --namespace cloud-endpoints --template="{{range .status.loadBalancer.ingress}}{{.ip}}{{end}}")
  [ -z "$ip" ] && sleep 10
done
echo 'Found external IP: '$ip