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from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
from airflow.contrib.kubernetes import kube_client, pod_generator, pod_launcher
from airflow.contrib.kubernetes.pod import Resources
from airflow.utils.state import State
from airflow.contrib.kubernetes.volume_mount import VolumeMount # noqa
from airflow.contrib.kubernetes.volume import Volume # noqa
from airflow.contrib.kubernetes.secret import Secret # noqa
template_fields = ('templates_dict',)
template_ext = tuple()
ui_color = '#ffefeb'
[docs]class KubernetesPodOperator(BaseOperator):
"""
Execute a task in a Kubernetes Pod
:param image: Docker image you wish to launch. Defaults to dockerhub.io,
but fully qualified URLS will point to custom repositories
:type image: str
:param: namespace: the namespace to run within kubernetes
:type: namespace: str
:param cmds: entrypoint of the container. (templated)
The docker images's entrypoint is used if this is not provide.
:type cmds: list of str
:param arguments: arguments of to the entrypoint. (templated)
The docker image's CMD is used if this is not provided.
:type arguments: list of str
:param volume_mounts: volumeMounts for launched pod
:type volume_mounts: list of VolumeMount
:param volumes: volumes for launched pod. Includes ConfigMaps and PersistentVolumes
:type volumes: list of Volume
:param labels: labels to apply to the Pod
:type labels: dict
:param startup_timeout_seconds: timeout in seconds to startup the pod
:type startup_timeout_seconds: int
:param name: name of the task you want to run,
will be used to generate a pod id
:type name: str
:param env_vars: Environment variables initialized in the container. (templated)
:type env_vars: dict
:param secrets: Kubernetes secrets to inject in the container,
They can be exposed as environment vars or files in a volume.
:type secrets: list of Secret
:param in_cluster: run kubernetes client with in_cluster configuration
:type in_cluster: bool
:param cluster_context: context that points to kubernetes cluster.
Ignored when in_cluster is True. If None, current-context is used.
:type cluster_context: string
:param get_logs: get the stdout of the container as logs of the tasks
:type get_logs: bool
:param affinity: A dict containing a group of affinity scheduling rules
:type affinity: dict
:param node_selectors: A dict containing a group of scheduling rules
:type node_selectors: dict
:param config_file: The path to the Kubernetes config file
:type config_file: str
:param xcom_push: If xcom_push is True, the content of the file
/airflow/xcom/return.json in the container will also be pushed to an
XCom when the container completes.
:type xcom_push: bool
:param tolerations: Kubernetes tolerations
:type list of tolerations
"""
template_fields = ('cmds', 'arguments', 'env_vars', 'config_file')
[docs] def execute(self, context):
try:
client = kube_client.get_kube_client(in_cluster=self.in_cluster,
cluster_context=self.cluster_context,
config_file=self.config_file)
gen = pod_generator.PodGenerator()
for mount in self.volume_mounts:
gen.add_mount(mount)
for volume in self.volumes:
gen.add_volume(volume)
pod = gen.make_pod(
namespace=self.namespace,
image=self.image,
pod_id=self.name,
cmds=self.cmds,
arguments=self.arguments,
labels=self.labels,
)
pod.service_account_name = self.service_account_name
pod.secrets = self.secrets
pod.envs = self.env_vars
pod.image_pull_policy = self.image_pull_policy
pod.annotations = self.annotations
pod.resources = self.resources
pod.affinity = self.affinity
pod.node_selectors = self.node_selectors
pod.hostnetwork = self.hostnetwork
pod.tolerations = self.tolerations
launcher = pod_launcher.PodLauncher(kube_client=client,
extract_xcom=self.xcom_push)
(final_state, result) = launcher.run_pod(
pod,
startup_timeout=self.startup_timeout_seconds,
get_logs=self.get_logs)
if self.is_delete_operator_pod:
launcher.delete_pod(pod)
if final_state != State.SUCCESS:
raise AirflowException(
'Pod returned a failure: {state}'.format(state=final_state)
)
if self.xcom_push:
return result
except AirflowException as ex:
raise AirflowException('Pod Launching failed: {error}'.format(error=ex))
@apply_defaults
def __init__(self,
namespace,
image,
name,
cmds=None,
arguments=None,
volume_mounts=None,
volumes=None,
env_vars=None,
secrets=None,
in_cluster=False,
cluster_context=None,
labels=None,
startup_timeout_seconds=120,
get_logs=True,
image_pull_policy='IfNotPresent',
annotations=None,
resources=None,
affinity=None,
config_file=None,
xcom_push=False,
node_selectors=None,
image_pull_secrets=None,
service_account_name="default",
is_delete_operator_pod=False,
hostnetwork=False,
tolerations=None,
*args,
**kwargs):
super(KubernetesPodOperator, self).__init__(*args, **kwargs)
self.image = image
self.namespace = namespace
self.cmds = cmds or []
self.arguments = arguments or []
self.labels = labels or {}
self.startup_timeout_seconds = startup_timeout_seconds
self.name = name
self.env_vars = env_vars or {}
self.volume_mounts = volume_mounts or []
self.volumes = volumes or []
self.secrets = secrets or []
self.in_cluster = in_cluster
self.cluster_context = cluster_context
self.get_logs = get_logs
self.image_pull_policy = image_pull_policy
self.node_selectors = node_selectors or {}
self.annotations = annotations or {}
self.affinity = affinity or {}
self.xcom_push = xcom_push
self.resources = resources or Resources()
self.config_file = config_file
self.image_pull_secrets = image_pull_secrets
self.service_account_name = service_account_name
self.is_delete_operator_pod = is_delete_operator_pod
self.hostnetwork = hostnetwork
self.tolerations = tolerations or []