Support bypassing cluster local kubeconfig in favor of explicit kubeconfig

[xrmzju]

Update by @consideRatio

If KubeSpawner is to do work in another cluster, it needs a way to get passed the credentials to speak with that k8s clusters api-server. Currently our logic doesn't support this.

kubespawner/kubespawner/reflector.py

Lines 125 to 132 in 37a80ab

	def __init__(self, *args, **kwargs):
	super().__init__(*args, **kwargs)
	# Load kubernetes config here, since this is a Singleton and
	# so this __init__ will be run way before anything else gets run.
	try:
	config.load_incluster_config()
	except config.ConfigException:
	config.load_kube_config()

Original issue

(blank)

[consideRatio]

I need more details here to better think about this.

I use kubespawner from a jupyterhub living in a container in a pod in the k8s it control. I do it as part of the zero-to-jupyterhub-k8/s project. This jupyterhub pod has the rights to work on with the k8s api-server in the cluster by the RBAC details configured for the pod's service account.

Please describe your use case a bit @xrmzju, that is essential for work to be done towards it.

[xrmzju]

I need more details here to better think about this.

I use kubespawner from a jupyterhub living in a container in a pod in the k8s it control. I do it as part of the zero-to-jupyterhub-k8/s project. This jupyterhub pod has the rights to work on with the k8s api-server in the cluster by the RBAC details configured for the pod's service account.

Please describe your use case a bit @xrmzju, that is essential for work to be done towards it.

sry i just opened the issue for a mark yesterday. in my case, i need to deploy jupyterhub in cluster A and create notebook pod in cluster B, so kubespawner need to support load external cluster config(in my case, kubeconfig), but for now, it uses the default in cluster client.

[manics]

@xrmzju What happens when you specify a kubeconfig at the moment?

kubespawner/kubespawner/reflector.py

Lines 125 to 132 in 37a80ab

	def __init__(self, *args, **kwargs):
	super().__init__(*args, **kwargs)
	# Load kubernetes config here, since this is a Singleton and
	# so this __init__ will be run way before anything else gets run.
	try:
	config.load_incluster_config()
	except config.ConfigException:
	config.load_kube_config()

implies it should already work.

[xrmzju]

@xrmzju What happens when you specify a kubeconfig at the moment?

kubespawner/kubespawner/reflector.py

Lines 125 to 132 in 37a80ab

	def __init__(self, *args, **kwargs):
	super().__init__(*args, **kwargs)
	# Load kubernetes config here, since this is a Singleton and
	# so this __init__ will be run way before anything else gets run.
	try:
	config.load_incluster_config()
	except config.ConfigException:
	config.load_kube_config()

implies it should already work.

i made it work by pass api_client client = Client(api_client=config.new_client_from_config(),*args, **kwargs) in
L43