pykube

Python client library for Kubernetes

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pykube

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Python client library for Kubernetes

.. image:: https://storage.googleapis.com/kel-assets/kel_full-02_200.jpg :target: http://kelproject.com/

Kel is an open source Platform as a Service (PaaS) from Eldarion, Inc. that makes it easy to manage web application deployment and hosting through the entire lifecycle from development through testing to production. It adds components and tools on top of Kubernetes that help developers manage their application infrastructure. Kel builds on Eldarion's 7+ years experience running one of the leading Python and Django PaaSes.

For more information about Kel, see kelproject.com, follow us on Twitter @projectkel, and join our Slack team_.

.. kelproject.com: http://kelproject.com/ .. @projectkel: https://twitter.com/projectkel .. _Slack team: http://slack.kelproject.com/

Features

  • HTTP interface using requests using kubeconfig for authentication
  • Python native querying of Kubernetes API objects

Installation

To install pykube, use pip::

pip install pykube

Usage

Query for all ready pods in a custom namespace:

.. code:: python

import operator
import pykube

api = pykube.HTTPClient(pykube.KubeConfig.from_file("/Users/<username>/.kube/config"))
pods = pykube.Pod.objects(api).filter(namespace="gondor-system")
ready_pods = filter(operator.attrgetter("ready"), pods)

Access any attribute of the Kubernetes object:

.. code:: python

pod = pykube.Pod.objects(api).filter(namespace="gondor-system").get(name="my-pod")
pod.obj["spec"]["containers"][0]["image"]

Selector query:

.. code:: python

pods = pykube.Pod.objects(api).filter(
    namespace="gondor-system",
    selector={"gondor.io/name__in": {"api-web", "api-worker"}},
)
pending_pods = pykube.objects.Pod.objects(api).filter(
    field_selector={"status.phase": "Pending"}
)

Watch query:

.. code:: python

watch = pykube.Job.objects(api, namespace="gondor-system")
watch = watch.filter(field_selector={"metadata.name": "my-job"}).watch()

# watch is a generator:
for watch_event in watch:
    print(watch_event.type) # 'ADDED', 'DELETED', 'MODIFIED'
    print(watch_event.object) # pykube.Job object

Create a ReplicationController:

.. code:: python

obj = {
    "apiVersion": "v1",
    "kind": "ReplicationController",
    "metadata": {
        "name": "my-rc",
        "namespace": "gondor-system"
    },
    "spec": {
        "replicas": 3,
        "selector": {
            "app": "nginx"
        },
        "template": {
            "metadata": {
                "labels": {
                    "app": "nginx"
                }
            },
            "spec": {
                "containers": [
                    {
                        "name": "nginx",
                        "image": "nginx",
                        "ports": [
                            {"containerPort": 80}
                        ]
                    }
                ]
            }
        }
    }
}
pykube.ReplicationController(api, obj).create()

Delete a ReplicationController:

.. code:: python

obj = {
    "apiVersion": "v1",
    "kind": "ReplicationController",
    "metadata": {
        "name": "my-rc",
        "namespace": "gondor-system"
    }
}
pykube.ReplicationController(api, obj).delete()

Check server version:

.. code:: python

api = pykube.HTTPClient(pykube.KubeConfig.from_file("/Users/<username>/.kube/config"))
api.version

HTTPie

pykube can be used together with HTTPie for Kubernetes command line querying goodness. For example:

.. code:: shell

pip install httpie
http pykube://minikube/api/v1/services

The above example will construct an HTTP request to the cluster behind the minikube context and show you the response containing all services.

Requirements

  • Python 2.7 or 3.3+
  • requests (included in install_requires)
  • PyYAML (included in install_requires)

License

The code in this project is licensed under the Apache License, version 2.0 (included in this repository under LICENSE).

Contributing

By making a contribution to this project, you are agreeing to the Developer Certificate of Origin v1.1_ (also included in this repository under DCO.txt).

.. _Developer Certificate of Origin v1.1: http://developercertificate.org

Code of Conduct

In order to foster a kind, inclusive, and harassment-free community, the Kel Project follows the Contributor Covenant Code of Conduct_.

.. _Contributor Covenant Code of Conduct: http://contributor-covenant.org/version/1/4/

Commercial Support

Commercial support for Kel is available through Eldarion, please contact info@eldarion.com.

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