Working with Kubernetes using Python - Part 02 - Switch context

Following code snipet uses kubeconfig python module and it takes the default kubeconfig file, and switch to a new context. 

kubectl commands: 

kubectl config get-contexts
kubectl config current-context
kubectl config use-context <context_name>

Code: 

	# prerequisite: pip3 install kubeconfig
	# this code snipet can be used to switch to a different context
	from kubeconfig import KubeConfig
	import argparse
	def main():
	parser = argparse.ArgumentParser()
	parser.add_argument(
	"-c", "--cluster", required=True, help="K8s cluster context name"
	)
	args = parser.parse_args()
	new_context = args.cluster
	conf = KubeConfig()
	print("Kubeconfig file: ", conf.view())
	print("Current context: ", conf.current_context())
	conf.use_context(new_context)
	print("Switched to context: ", conf.current_context())
	if __name__ == "__main__":
	main()

view raw switch_context.py hosted with ❤ by GitHub

Note: If you want to use a specific kubeconfig file, instead of  conf = KubeConfig() 

you can use conf = KubeConfig('path-to-your-kubeconfig')

Reference:

https://kubeconfig-python.readthedocs.io/en/latest/

Hope it was useful. Cheers!

Working with Kubernetes using Python - Part 01 - List contexts

Following code snipet uses Python client for the kubernetes API and it takes the default kubeconfig file, list the contexts, and active context. 

kubectl commands: 

kubectl config get-contexts
kubectl config current-context

Code: 

	# prerequisite: pip3 install kubernetes
	from kubernetes import client, config
	def main():
	"""
	This function will use the default kubeconfig file, list the contexts, and active context.
	"""
	contexts, active_context = config.list_kube_config_contexts()
	if not contexts:
	print("Cannot find any context in kube-config file.")
	return
	contexts = [context["name"] for context in contexts]
	active_index = contexts.index(active_context["name"])
	active_context = active_context["name"]
	print(f"List of contexts: {contexts}")
	print(f"Active context index is: {active_index}")
	print(f"Actice context name is: {active_context}")
	if __name__ == "__main__":
	main()

view raw list_contexts.py hosted with ❤ by GitHub

Note: If you want to use a specific kubeconfig file, instead of  

contexts, active_context = config.list_kube_config_contexts() 

you can use  

contexts, active_context = config.list_kube_config_contexts(config_file="path-to-kubeconfig")

Reference:

https://github.com/kubernetes-client/python

Hope it was useful. Cheers!