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# 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 following:
- Creation of a k8s deployment using dynamic-client
- Rolling restart of the deployment (demonstrate patch/update action)
- Listing & deletion of the deployment
"""
from kubernetes import config, dynamic
from kubernetes.client import api_client
import datetime
import pytz
def main():
# Creating a dynamic client
client = dynamic.DynamicClient(
api_client.ApiClient(configuration=config.load_kube_config())
)
# fetching the deployment api
api = client.resources.get(api_version="apps/v1", kind="Deployment")
name = "nginx-deployment"
deployment_manifest = {
"apiVersion": "apps/v1",
"kind": "Deployment",
"metadata": {"labels": {"app": "nginx"}, "name": name},
"spec": {
"replicas": 3,
"selector": {"matchLabels": {"app": "nginx"}},
"template": {
"metadata": {"labels": {"app": "nginx"}},
"spec": {
"containers": [
{
"name": "nginx",
"image": "nginx:1.14.2",
"ports": [{"containerPort": 80}],
}
]
},
},
},
}
# Creating deployment `nginx-deployment` in the `default` namespace
deployment = api.create(body=deployment_manifest, namespace="default")
print("\n[INFO] deployment `nginx-deployment` created\n")
# Listing deployment `nginx-deployment` in the `default` namespace
deployment_created = api.get(name=name, namespace="default")
print("%s\t%s\t\t\t%s\t%s" % ("NAMESPACE", "NAME", "REVISION", "RESTARTED-AT"))
print(
"%s\t\t%s\t%s\t\t%s\n"
% (
deployment_created.metadata.namespace,
deployment_created.metadata.name,
deployment_created.metadata.annotations,
deployment_created.spec.template.metadata.annotations,
)
)
# Patching the `spec.template.metadata` section to add `kubectl.kubernetes.io/restartedAt` annotation
# In order to perform a rolling restart on the deployment `nginx-deployment`
deployment_manifest["spec"]["template"]["metadata"] = {
"annotations": {
"kubectl.kubernetes.io/restartedAt": datetime.datetime.now(tz=pytz.UTC)
.isoformat()
}
}
deployment_patched = api.patch(
body=deployment_manifest, name=name, namespace="default"
)
print("\n[INFO] deployment `nginx-deployment` restarted\n")
print(
"%s\t%s\t\t\t%s\t\t\t\t\t\t%s"
% ("NAMESPACE", "NAME", "REVISION", "RESTARTED-AT")
)
print(
"%s\t\t%s\t%s\t\t%s\n"
% (
deployment_patched.metadata.namespace,
deployment_patched.metadata.name,
deployment_patched.metadata.annotations,
deployment_patched.spec.template.metadata.annotations,
)
)
# Deleting deployment `nginx-deployment` from the `default` namespace
deployment_deleted = api.delete(name=name, body={}, namespace="default")
print("\n[INFO] deployment `nginx-deployment` deleted\n")
if __name__ == "__main__":
main()
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