replication_controller.py

# Copyright 2021 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
This example demonstrates the creation, listing & deletion of a namespaced replication controller using dynamic-client.
"""

from kubernetes import config, dynamic
from kubernetes.client import api_client


def main():
    # Creating a dynamic client
    client = dynamic.DynamicClient(
        api_client.ApiClient(configuration=config.load_kube_config())
    )

    # fetching the replication controller api
    api = client.resources.get(api_version="v1", kind="ReplicationController")

    name = "frontend-replication-controller"

    replication_controller_manifest = {
        "apiVersion": "v1",
        "kind": "ReplicationController",
        "metadata": {"labels": {"name": name}, "name": name},
        "spec": {
            "replicas": 2,
            "selector": {"name": name},
            "template": {
                "metadata": {"labels": {"name": name}},
                "spec": {
                    "containers": [
                        {
                            "image": "nginx",
                            "name": "nginx",
                            "ports": [{"containerPort": 80, "protocol": "TCP"}],
                        }
                    ]
                },
            },
        },
    }

    # Creating replication-controller `frontend-replication-controller` in the `default` namespace
    replication_controller = api.create(
        body=replication_controller_manifest, namespace="default"
    )

    print("\n[INFO] replication-controller `frontend-replication-controller` created\n")

    # Listing replication-controllers in the `default` namespace
    replication_controller_created = api.get(name=name, namespace="default")

    print("%s\t%s\t\t\t\t\t%s" % ("NAMESPACE", "NAME", "REPLICAS"))
    print(
        "%s\t\t%s\t\t%s\n"
        % (
            replication_controller_created.metadata.namespace,
            replication_controller_created.metadata.name,
            replication_controller_created.spec.replicas,
        )
    )

    # Deleting replication-controller `frontend-service` from the `default` namespace

    replication_controller_deleted = api.delete(name=name, body={}, namespace="default")

    print("[INFO] replication-controller `frontend-replication-controller` deleted\n")


if __name__ == "__main__":
    main()