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feat: Add support for loading in-cluster config when running inside a pod

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in some cases, tutor might run inside a pod, which that pod has access to a cluster via role binding and a service account. this way, there's no ./kube/config file, but kubectl commands run with no issue.

Close #843
This commit is contained in:
Emad Rad 2023-06-01 16:36:44 +03:30 committed by Régis Behmo
parent 4bb8671f26
commit 86f846aba3
1 changed files with 15 additions and 1 deletions
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16
tutor/commands/k8s.py
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@ -1,3 +1,4 @@
import os
from datetime import datetime
from time import sleep
from typing import Any, Iterable, List, Optional, Type
@ -26,7 +27,20 @@ class K8sClients:
# pylint: disable=import-outside-toplevel
from kubernetes import client, config
config.load_kube_config()
if os.path.exists(config.kube_config.KUBE_CONFIG_DEFAULT_LOCATION):
# found the kubeconfig file, let's load it!
config.load_kube_config()
elif (
config.incluster_config.SERVICE_HOST_ENV_NAME in os.environ
and config.incluster_config.SERVICE_PORT_ENV_NAME in os.environ
):
# We are running inside a cluster, let's load the in-cluster configuration.
config.load_incluster_config()
else:
raise exceptions.TutorError(
f"there is no Kubernetes configuration file located in {config.kube_config.KUBE_CONFIG_DEFAULT_LOCATION}, and the service environment variables {config.incluster_config.SERVICE_HOST_ENV_NAME} and {config.incluster_config.SERVICE_PORT_ENV_NAME} have not been defined. To connect to a cluster, please configure your host appropriately."
)
self._batch_api = None
self._core_api = None
self._client = client