update deployment_crud.py to include a deployment rolling restart method for typed client

Priyankasaggu11929 · Priyankasaggu11929 · commit c77a8ba3e8ac · 2021-05-04T02:29:58.000+05:30
diff --git a/examples/deployment_crud.py b/examples/deployment_crud.py
@@ -13,10 +13,15 @@
 # limitations under the License.
 
 """
-Creates, updates, and deletes a deployment using AppsV1Api.
+The example covers the following:
+    - Creation of a deployment using AppsV1Api
+    - update/patch to perform rolling restart on the deployment
+    - deletetion of the deployment 
 """
 
 from kubernetes import client, config
+import datetime
+import pytz
 
 DEPLOYMENT_NAME = "nginx-deployment"
 
@@ -29,45 +34,94 @@ def create_deployment_object():
         ports=[client.V1ContainerPort(container_port=80)],
         resources=client.V1ResourceRequirements(
             requests={"cpu": "100m", "memory": "200Mi"},
-            limits={"cpu": "500m", "memory": "500Mi"}
-        )
+            limits={"cpu": "500m", "memory": "500Mi"},
+        ),
     )
     # Create and configurate a spec section
     template = client.V1PodTemplateSpec(
         metadata=client.V1ObjectMeta(labels={"app": "nginx"}),
-        spec=client.V1PodSpec(containers=[container]))
+        spec=client.V1PodSpec(containers=[container]),
+    )
     # Create the specification of deployment
     spec = client.V1DeploymentSpec(
-        replicas=3,
-        template=template,
-        selector={'matchLabels': {'app': 'nginx'}})
+        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)
+        spec=spec,
+    )
 
     return deployment
 
 
 def create_deployment(api_instance, deployment):
     # Create deployement
     api_response = api_instance.create_namespaced_deployment(
-        body=deployment,
-        namespace="default")
-    print("Deployment created. status='%s'" % str(api_response.status))
+        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"
+        % (
+            api_response.metadata.namespace,
+            api_response.metadata.name,
+            api_response.metadata.generation,
+            api_response.spec.template.spec.containers[0].image,
+        )
+    )
+    return api_response
 
 
 def update_deployment(api_instance, deployment):
     # Update container image
     deployment.spec.template.spec.containers[0].image = "nginx:1.16.0"
-    # Update the deployment
+
+    # patch the deployment
     api_response = api_instance.patch_namespaced_deployment(
-        name=DEPLOYMENT_NAME,
-        namespace="default",
-        body=deployment)
-    print("Deployment updated. status='%s'" % str(api_response.status))
+        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"
+        % (
+            api_response.metadata.namespace,
+            api_response.metadata.name,
+            api_response.metadata.generation,
+            api_response.spec.template.spec.containers[0].image,
+        )
+    )
+
+
+def rolling_restart_deployment(api_instance, deployment):
+    # update `spec.template.metadata` section to add `kubectl.kubernetes.io/restartedAt` annotation
+    deployment.spec.template.metadata.annotations = {
+        "kubectl.kubernetes.io/restartedAt": datetime.datetime.utcnow()
+        .replace(tzinfo=pytz.UTC)
+        .isoformat()
+    }
+
+    # patch the deployment
+    api_response = api_instance.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"
+        % (
+            api_response.metadata.name,
+            api_response.metadata.generation,
+            api_response.spec.template.metadata.annotations,
+        )
+    )
 
 
 def delete_deployment(api_instance):
@@ -76,9 +130,10 @@ def delete_deployment(api_instance):
         name=DEPLOYMENT_NAME,
         namespace="default",
         body=client.V1DeleteOptions(
-            propagation_policy='Foreground',
-            grace_period_seconds=5))
-    print("Deployment deleted. status='%s'" % str(api_response.status))
+            propagation_policy="Foreground", grace_period_seconds=5
+        ),
+    )
+    print("\n[INFO] deployment `nginx-deployment` deleted.")
 
 
 def main():
@@ -101,8 +156,10 @@ def main():
 
     update_deployment(apps_v1, deployment)
 
+    rolling_restart_deployment(apps_v1, deployment)
+
     delete_deployment(apps_v1)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()
