120 lines
3.8 KiB
Python
120 lines
3.8 KiB
Python
# Copyright 2021 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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This example demonstrates the following:
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- Creation of a k8s deployment using dynamic-client
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- Rolling restart of the deployment (demonstrate patch/update action)
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- Listing & deletion of the deployment
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"""
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from kubernetes import config, dynamic
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from kubernetes.client import api_client
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import datetime
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import pytz
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def main():
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# Creating a dynamic client
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client = dynamic.DynamicClient(
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api_client.ApiClient(configuration=config.load_kube_config())
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)
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# fetching the deployment api
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api = client.resources.get(api_version="apps/v1", kind="Deployment")
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name = "nginx-deployment"
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deployment_manifest = {
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"apiVersion": "apps/v1",
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"kind": "Deployment",
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"metadata": {"labels": {"app": "nginx"}, "name": name},
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"spec": {
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"replicas": 3,
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"selector": {"matchLabels": {"app": "nginx"}},
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"template": {
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"metadata": {"labels": {"app": "nginx"}},
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"spec": {
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"containers": [
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{
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"name": "nginx",
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"image": "nginx:1.14.2",
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"ports": [{"containerPort": 80}],
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}
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]
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},
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},
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},
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}
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# Creating deployment `nginx-deployment` in the `default` namespace
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deployment = api.create(body=deployment_manifest, namespace="default")
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print("\n[INFO] deployment `nginx-deployment` created\n")
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# Listing deployment `nginx-deployment` in the `default` namespace
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deployment_created = api.get(name=name, namespace="default")
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print("%s\t%s\t\t\t%s\t%s" % ("NAMESPACE", "NAME", "REVISION", "RESTARTED-AT"))
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print(
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"%s\t\t%s\t%s\t\t%s\n"
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% (
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deployment_created.metadata.namespace,
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deployment_created.metadata.name,
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deployment_created.metadata.annotations,
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deployment_created.spec.template.metadata.annotations,
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)
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)
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# Patching the `spec.template.metadata` section to add `kubectl.kubernetes.io/restartedAt` annotation
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# In order to perform a rolling restart on the deployment `nginx-deployment`
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deployment_manifest["spec"]["template"]["metadata"] = {
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"annotations": {
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"kubectl.kubernetes.io/restartedAt": datetime.datetime.now(tz=pytz.UTC)
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.isoformat()
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}
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}
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deployment_patched = api.patch(
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body=deployment_manifest, name=name, namespace="default"
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)
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print("\n[INFO] deployment `nginx-deployment` restarted\n")
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print(
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"%s\t%s\t\t\t%s\t\t\t\t\t\t%s"
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% ("NAMESPACE", "NAME", "REVISION", "RESTARTED-AT")
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)
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print(
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"%s\t\t%s\t%s\t\t%s\n"
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% (
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deployment_patched.metadata.namespace,
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deployment_patched.metadata.name,
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deployment_patched.metadata.annotations,
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deployment_patched.spec.template.metadata.annotations,
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)
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)
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# Deleting deployment `nginx-deployment` from the `default` namespace
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deployment_deleted = api.delete(name=name, body={}, namespace="default")
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print("\n[INFO] deployment `nginx-deployment` deleted\n")
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if __name__ == "__main__":
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main()
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