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Serguei Bezverkhi
2018-02-15 08:50:31 -05:00
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vendor/k8s.io/client-go/examples/in-cluster-client-configuration/README.md generated vendored
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# Authenticating inside the cluster
This example shows you how to configure a client with client-go to authenticate
to the Kubernetes API from an application running inside the Kubernetes cluster.
client-go uses the [Service Account token][sa] mounted inside the Pod at the
`/var/run/secrets/kubernetes.io/serviceaccount` path when the
`rest.InClusterConfig()` is used.
## Running this example
First compile the application for Linux:
cd in-cluster-client-configuration
GOOS=linux go build -o ./app .
Then package it to a docker image using the provided Dockerfile to run it on
Kubernetes.
If you are running a [Minikube][mk] cluster, you can build this image directly
on the Docker engine of the Minikube node without pushing it to a registry. To
build the image on Minikube:
eval $(minikube docker-env)
docker build -t in-cluster .
If you are not using Minikube, you should build this image and push it to a registry
that your Kubernetes cluster can pull from.
Then, run the image in a Pod with a single instance Deployment:
$ kubectl run --rm -i demo --image=in-cluster --image-pull-policy=Never
There are 4 pods in the cluster
There are 4 pods in the cluster
There are 4 pods in the cluster
...
The example now runs on Kubernetes API and successfully queries the number of
pods in the cluster every 10 seconds.
### Clean up
To stop this example and clean up the pod, press <kbd>Ctrl</kbd>+<kbd>C</kbd> on
the `kubectl run` command and then run:
kubectl delete deployment demo
[sa]: https://kubernetes.io/docs/admin/authentication/#service-account-tokens
[mk]: https://kubernetes.io/docs/getting-started-guides/minikube/