mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-24 05:50:22 +00:00
51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
|
# 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/
|