Add an environment variable that defines which config to load

See https://stackoverflow.com/a/63873828

config.py

@@ -15,3 +15,8 @@ KRATOS_PUBLIC_URL = str(os.environ.get("KRATOS_PUBLIC_URL")) + "/"
 
 SQLALCHEMY_DATABASE_URI = os.environ.get("DATABASE_URL")
 SQLALCHEMY_TRACK_MODIFICATIONS = False
+
+# Set this to "true" to load the config from a Kubernetes serviceaccount
+# running in a Kubernetes pod. Set it to "false" to load the config from the
+# `KUBECONFIG` environment variable.
+LOAD_INCLUSTER_CONFIG = os.environ.get("LOAD_INCLUSTER_CONFIG").lower() == "true"

docker-compose.yml

@@ -32,6 +32,9 @@ services:
       - SECRET_KEY=$FLASK_SECRET_KEY
       - HYDRA_CLIENT_SECRET=$HYDRA_CLIENT_SECRET
       - KUBECONFIG=/.kube/config
+
+      # Disable loading config from the service account
+      - LOAD_INCLUSTER_CONFIG=false
     ports:
       - "5000:5000"
     user: "${KUBECTL_UID}:${KUBECTL_GID}"

helpers/kubernetes.py

@@ -14,12 +14,17 @@ from kubernetes.utils import create_from_yaml
 from kubernetes.utils.create_from_yaml import FailToCreateError
 from flask import current_app
 
+from config import LOAD_INCLUSTER_CONFIG
+
 # Load the kube config once
 #
 # By default this loads whatever we define in the `KUBECONFIG` env variable,
 # otherwise loads the config from default locations, similar to what kubectl
 # does.
-config.load_kube_config()
+if LOAD_INCLUSTER_CONFIG:
+    config.load_incluster_config()
+else:
+    config.load_kube_config()
 
 def create_variables_secret(app_slug, variables_filepath):
     """Checks if a variables secret for app_name already exists, generates it if necessary.