Add Job examples

Author: haiker2011

examples/job_examples.py

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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.
+
+from os import path
+
+import yaml
+
+from kubernetes import client, config
+
+JOB_NAME = "pi"
+
+
+def create_job_object():
+    # Configureate Pod template container
+    container = client.V1Container(
+        name="pi",
+        image="perl",
+        command=["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"],
+        )
+    # Create and configurate a spec section
+    template = client.V1PodTemplateSpec(
+        metadata=client.V1ObjectMeta(labels={"app": "pi"}),
+        spec=client.V1PodSpec(restart_policy="Never", containers=[container]))
+    # Create the specification of deployment
+    spec = client.V1JobSpec(
+        template=template,
+        backoff_limit=4)
+    # Instantiate the job object
+    job = client.V1Job(
+        api_version="batch/v1",
+        kind="Job",
+        metadata=client.V1ObjectMeta(name=JOB_NAME),
+        spec=spec)
+
+    return job
+
+
+def create_job(api_instance, job):
+    # Create job
+    api_response = api_instance.create_namespaced_job(
+        body=job,
+        namespace="default")
+    print("Job created. status='%s'" % str(api_response.status))
+
+
+def update_job(api_instance, job):
+    # Update container image
+    job.spec.template.spec.containers[0].image = "perl"
+    # Update the job
+    api_response = api_instance.patch_namespaced_job(
+        name=JOB_NAME,
+        namespace="default",
+        body=job)
+    print("Job updated. status='%s'" % str(api_response.status))
+
+
+def delete_job(api_instance):
+    # Delete job
+    api_response = api_instance.delete_namespaced_job(
+        name=JOB_NAME,
+        namespace="default",
+        body=client.V1DeleteOptions(
+            propagation_policy='Foreground',
+            grace_period_seconds=5))
+    print("Job deleted. status='%s'" % str(api_response.status))
+
+
+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()
+    batch_v1 = client.BatchV1Api()
+    # Create a job object with client-python API. The job we
+    # created is same as the `pi-job.yaml` in the /examples folder.
+    job = create_job_object()
+
+    create_job(batch_v1, job)
+
+    update_job(batch_v1, job)
+
+    delete_job(batch_v1)
+
+
+if __name__ == '__main__':
+    main()

examples/pi-job.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: pi
+spec:
+  template:
+    spec:
+      containers:
+      - name: pi
+        image: perl
+        command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
+      restartPolicy: Never
+  backoffLimit: 4
+
+