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# Copyright 2016 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.
"""
The example covers the following:
- Creation of a deployment using AppsV1Api
- update/patch to perform rolling restart on the deployment
- deletetion of the deployment
"""
import datetime
import pytz
from kubernetes import client, config
DEPLOYMENT_NAME = "nginx-deployment"
def create_deployment_object():
# Configureate Pod template container
container = client.V1Container(
name="nginx",
image="nginx:1.15.4",
ports=[client.V1ContainerPort(container_port=80)],
resources=client.V1ResourceRequirements(
requests={"cpu": "100m", "memory": "200Mi"},
limits={"cpu": "500m", "memory": "500Mi"},
),
)
# Create and configure a spec section
template = client.V1PodTemplateSpec(
metadata=client.V1ObjectMeta(labels={"app": "nginx"}),
spec=client.V1PodSpec(containers=[container]),
)
# Create the specification of deployment
spec = client.V1DeploymentSpec(
replicas=3, template=template, selector={
"matchLabels":
{"app": "nginx"}})
# Instantiate the deployment object
deployment = client.V1Deployment(
api_version="apps/v1",
kind="Deployment",
metadata=client.V1ObjectMeta(name=DEPLOYMENT_NAME),
spec=spec,
)
return deployment
def create_deployment(api, deployment):
# Create deployment
resp = api.create_namespaced_deployment(
body=deployment, namespace="default"
)
print("\n[INFO] deployment `nginx-deployment` created.\n")
print("%s\t%s\t\t\t%s\t%s" % ("NAMESPACE", "NAME", "REVISION", "IMAGE"))
print(
"%s\t\t%s\t%s\t\t%s\n"
% (
resp.metadata.namespace,
resp.metadata.name,
resp.metadata.generation,
resp.spec.template.spec.containers[0].image,
)
)
def update_deployment(api, deployment):
# Update container image
deployment.spec.template.spec.containers[0].image = "nginx:1.16.0"
# patch the deployment
resp = api.patch_namespaced_deployment(
name=DEPLOYMENT_NAME, namespace="default", body=deployment
)
print("\n[INFO] deployment's container image updated.\n")
print("%s\t%s\t\t\t%s\t%s" % ("NAMESPACE", "NAME", "REVISION", "IMAGE"))
print(
"%s\t\t%s\t%s\t\t%s\n"
% (
resp.metadata.namespace,
resp.metadata.name,
resp.metadata.generation,
resp.spec.template.spec.containers[0].image,
)
)
def restart_deployment(api, deployment):
# update `spec.template.metadata` section
# to add `kubectl.kubernetes.io/restartedAt` annotation
deployment.spec.template.metadata.annotations = {
"kubectl.kubernetes.io/restartedAt": datetime.datetime.now(tz=pytz.UTC)
.isoformat()
}
# patch the deployment
resp = api.patch_namespaced_deployment(
name=DEPLOYMENT_NAME, namespace="default", body=deployment
)
print("\n[INFO] deployment `nginx-deployment` restarted.\n")
print("%s\t\t\t%s\t%s" % ("NAME", "REVISION", "RESTARTED-AT"))
print(
"%s\t%s\t\t%s\n"
% (
resp.metadata.name,
resp.metadata.generation,
resp.spec.template.metadata.annotations,
)
)
def delete_deployment(api):
# Delete deployment
resp = api.delete_namespaced_deployment(
name=DEPLOYMENT_NAME,
namespace="default",
body=client.V1DeleteOptions(
propagation_policy="Foreground", grace_period_seconds=5
),
)
print("\n[INFO] deployment `nginx-deployment` deleted.")
def main():
# Configs can be set in Configuration class directly or using helper
# utility. If no argument provided, the config will be loaded from
# default location.
config.load_kube_config()
apps_v1 = client.AppsV1Api()
# Uncomment the following lines to enable debug logging
# c = client.Configuration()
# c.debug = True
# apps_v1 = client.AppsV1Api(api_client=client.ApiClient(configuration=c))
# Create a deployment object with client-python API. The deployment we
# created is same as the `nginx-deployment.yaml` in the /examples folder.
deployment = create_deployment_object()
create_deployment(apps_v1, deployment)
update_deployment(apps_v1, deployment)
restart_deployment(apps_v1, deployment)
delete_deployment(apps_v1)
if __name__ == "__main__":
main()
|
