11c69ac127
Adding instructions for out-of-cluster example and making it work without specifying the -kubeconfig argument if the home directory can be inferred. This is part of the body of work improving the client library samples. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com> Kubernetes-commit: e59f05fe0ee6980c4bdaae76f5a77ef884bd2da1
Authenticating outside the cluster
This example shows you how to authenticate to the Kubernetes API from an application running outside the Kubernetes cluster with client-go.
You can use your kubeconfig file that contains the context information
of your cluster to initialize a client. The kubeconfig file is also used
by the kubectl command to authenticate to the clusters.
Running this example
Make sure your kubectl is configured and pointed to a cluster. Run
kubectl get nodes to confirm.
Run this application with:
cd out-of-cluster
go build -o app .
./app
Running this application will use the kubeconfig file and then authenticate to the cluster, and print the number of nodes in the cluster every 10 seconds:
$ ./app
There are 3 pods in the cluster
There are 3 pods in the cluster
There are 3 pods in the cluster
...
Press Ctrl+C to quit this application.
Note: You can use the
-kubeconfigoption to use a different config file. By default this program picks up the default file used by kubectl (whenKUBECONFIGenvironment variable is not set).