A Kubernetes API library
Project description
A simple, extensible Python client library for Kubernetes that feels familiar for folks who already know how to use kubectl.
Highlights
- API inspired by
kubectlfor a shallow learning curve. - Sensible defaults to reduce boiler plate.
- No swagger generated code, human readable code only.
- Has both a standard and an async API that can be used with
asyncioandtrio. - Client caching to reduce passing API objects around.
- Batteries included by providing useful utilities and methods inspired by
kubectl.
Quickstart
Installation
$ pip install kr8s
Examples
[!TIP] See the Examples Documentation for a full set of examples including
asyncioexamples.
List Nodes
Print out all of the node names in the cluster.
import kr8s
for node in kr8s.get("nodes"):
print(node.name)
Create a Pod
Create a new Pod.
from kr8s.objects import Pod
pod = Pod({
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"name": "my-pod",
},
"spec": {
"containers": [{"name": "pause", "image": "gcr.io/google_containers/pause",}]
},
})
pod.create()
Scale a Deployment
Scale the Deployment metrics-server in the Namespace kube-system to 1 replica.
from kr8s.objects import Deployment
deploy = Deployment.get("metrics-server", namespace="kube-system")
deploy.scale(1)
List Pods by label selector
Get all Pods from all Namespaces matching a label selector.
import kr8s
selector = {'component': 'kube-scheduler'}
for pod in kr8s.get("pods", namespace=kr8s.ALL, label_selector=selector):
print(pod.namespace, pod.name)
Add a label to a Pod
Add the label foo with the value bar to an existing Pod.
from kr8s.objects import Pod
pod = Pod("kube-apiserver", namespace="kube-system")
pod.label({"foo": "bar"})
Generate a Pod
Generate a simple Pod with a couple of keyword arguments.
from kr8s.objects import Pod
pod = Pod.gen(name="example-1", image="nginx:latest")
pod.create()
Cordon a Node
Cordon a Node to mark it as unschedulable.
from kr8s.objects import Node
node = Node("k8s-node-1")
node.cordon()
Pod Exec
Exec a command in a Pod.
from kr8s.objects import Pod
pod = Pod.get("my-pod")
command = pod.exec(["uptime"])
print(command.stdout.decode())
# 13:49:05 up 23:03, 0 users, load average: 0.66, 0.87, 0.85
Port forward a Pod
Open a port forward to a Pod as a background task/thread.
from kr8s.objects import Pod
pod = Pod.get("my-pod")
pf = pod.portforward(remote_port=1234, local_port=5678)
# Starts the port forward in a background thread
pf.start()
# Your other code goes here
# Optionally stop the port forward thread (it will exit with Python anyway)
pf.stop()
[!TIP] See the Examples Documentation for a full set of examples including
asyncioexamples.
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