How to create a Deployment

In this notebook, we show you how to create a Deployment with 3 ReplicaSets. These ReplicaSets are owned by the Deployment and are managed by the Deployment controller. We would also learn how to carry out RollingUpdate and RollBack to new and older versions of the deployment.



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from kubernetes import client, config

Load config from default location



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config.load_kube_config()
extension = client.ExtensionsV1beta1Api()

Create Deployment object



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deployment = client.ExtensionsV1beta1Deployment()

Fill required Deployment fields (apiVersion, kind, and metadata)



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deployment.api_version = "extensions/v1beta1"
deployment.kind = "Deployment"
deployment.metadata = client.V1ObjectMeta(name="nginx-deployment")

A Deployment also needs a .spec section



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spec = client.ExtensionsV1beta1DeploymentSpec()
spec.replicas = 3

Add Pod template in .spec.template section



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spec.template = client.V1PodTemplateSpec()
spec.template.metadata = client.V1ObjectMeta(labels={"app": "nginx"})
spec.template.spec = client.V1PodSpec()

Pod template container description



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container = client.V1Container()
container.name="nginx"
container.image="nginx:1.7.9"
container. ports = [client.V1ContainerPort(container_port=80)]



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spec.template.spec.containers = [container]
deployment.spec = spec

Create Deployment



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extension.create_namespaced_deployment(namespace="default", body=deployment)

Update container image



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deployment.spec.template.spec.containers[0].image = "nginx:1.9.1"

Apply update (RollingUpdate)



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extension.replace_namespaced_deployment(name="nginx-deployment", namespace="default", body=deployment)

Create DeploymentRollback object

This object is used to rollback to a previous version of the deployment.



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rollback = client.ExtensionsV1beta1DeploymentRollback()
rollback.api_version = "extensions/v1beta1"
rollback.kind = "DeploymentRollback"
rollback.rollback_to = client.ExtensionsV1beta1RollbackConfig()
rollback.rollback_to.revision = 0
rollback.name = "nginx-deployment"

Execute RollBack



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extension.create_namespaced_deployment_rollback_rollback(name="nginx-deployment", namespace="default", body=rollback)

Delete Deployment



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extension.delete_namespaced_deployment(name="nginx-deployment", namespace="default", body=client.V1DeleteOptions(propagation_policy="Foreground", grace_period_seconds=5))



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