Mount volumes with Secrets using Python Kubernetes API

Question

I'm writing an Airflow DAG using the KubernetesPodOperator. A Python process running in the container must open a file with sensitive data:

with open('credentials/jira_credentials.json', 'r') as f:
    creds = json.load(f)

and a CloudStorage client must be authenticated:

os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = "credentials/cloud_storage_credentials.json"

According to the best security practices I don't package a container's image with sensitive data. Instead I use Kubernetes Secrets. Using Python API for Kubernetes I'm trying to mount them as a volume but with no success. The credentials/ directory exists in the container but it's empty. What should I do to make files jira_crendentials.json and cloud_storage_credentials.json accessible in the container?

My DAG's code:

from airflow import DAG
from datetime import datetime, timedelta
from airflow.contrib.operators.kubernetes_pod_operator import KubernetesPodOperator
from airflow.kubernetes.secret import Secret
from airflow.kubernetes.volume import Volume
from airflow.kubernetes.volume_mount import VolumeMount
from airflow.operators.dummy_operator import DummyOperator
from kubernetes.client import models as k8s

default_args = {
    'owner': 'airflow',
    'depends_on_past': False,
    'start_date': datetime.utcnow(),
    'email': ['[email protected]'],
    'email_on_failure': False,
    'email_on_retry': False,
    'retry_delay': timedelta(minutes=5)
}

volume = Volume(name="volume-credentials", configs={})
volume_mnt = VolumeMount(mount_path="/credentials", name="volume-credentials", sub_path="", read_only=True)

secret_jira_user = Secret(deploy_type="volume",
                          deploy_target="/credentials",
                          secret="jira-user-secret",
                          key="jira_credentials.json")
secret_storage_credentials = Secret(deploy_type="volume",
                                    deploy_target="/credentials",
                                    secret="jira-trans-projects-cloud-storage-creds",
                                    key="cloud_storage_credentials.json")



dag = DAG(
    dag_id="jira_translations_project",
    schedule_interval="0 1 * * MON",
    start_date=datetime(2021, 9, 5, 0, 0, 0),
    max_active_runs=1,
    default_args=default_args
)

start = DummyOperator(task_id='START', dag=dag)

passing = KubernetesPodOperator(namespace='default',
                                image="eu.gcr.io/data-engineering/jira_downloader:v0.18",
                                cmds=["/usr/local/bin/run_process.sh"],
                                name="jira-translation-projects-01",
                                task_id="jira-translation-projects-01",
                                get_logs=True,
                                dag=dag,
                                volumes=[volume],
                                volume_mounts=[volume_mnt],
                                secrets=[
                                    secret_jira_user,
                                    secret_storage_credentials],
                                env_vars={'MIGRATION_DATETIME': '2021-01-02T03:04:05'}, 
                                )

start >> passing

Artem Yarmoliuk · Accepted Answer · 2021-09-15 14:35:14Z

2

According to this example, Secret is a special class that will handle creating volume mounts automatically. Looking at your code, seems that your own volume with mount /credentials is overriding /credentials mount created by Secret, and because you provide empty configs={}, that mount is empty as well.

Try supplying just secrets=[secret_jira_user,secret_storage_credentials] and removing manual volume_mounts.

Code that generates secret volume mounts under the hood

answered Sep 15, 2021 at 14:35

Artem Yarmoliuk

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