kubernetes InCluster client not working

[lamchakchan]

The Kubernetes InCluster setting is not working when kapacitor is mounted on a docker base image that can't resolve against /etc/resolve.conf search domains.

curl -sSk -H "Authorization: Bearer $KUBE_TOKEN" https://kubernetes/
curl: (6) Could not resolve host: kubernetes

The host for kubernetes is hardcoded here. This is dependent on DNS working. All containers are mounted with ENV values with Kubernetes API IP via KUBERNETES_SERVICE_HOST. We should use this not knowing which container supports proper DNS resolution. The client-go app uses ENV values for IP resolution as well.

This issue was found as part of the error that popped up during TICK script initialization for the k8sAutoscale node. It required the following url to be resolved to get at scaling state.

https://kubernetes/apis/extensions/v1beta1/namespaces/default/deployments/test-loader-xo-app-manifest/scale