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Using GCS connector with custom Flink images

To use Google Cloud Storage as remote storage for checkpoints, savepoints or job jar, you can create a custom Docker image based on the official Flink image and add GCS connector in it.

Create custom Docker image with GCS connector

Edit the Flink, Scala, GCS connections versions in properties file as you need. Then run the following command to build and push the image:

make build push IMAGE_TAG=gcr.io/[MY_PROJECT]/flink:[FLINK_VERSION]-scala_[SCALA_VERSION]-gcs

Before creating a Flink cluster

Before you create a Flink cluster with the custom image, you need to prepare several things:

GCP service account

  1. Create a service account with required GCS IAM roles on the bucket or use an existing service account, download the key file (JSON) to your local machine.

  2. Create Kubernetes Secret object with your service account key file.

kubectl create secret generic gcp-service-account-secret --from-file gcp_service_account_key.json=[/PATH/TO/KEY]

GCS connector config

GCS connector uses Hadoop core-site.xml as its config file, we need to create a ConfigMap and make the file available to the Flink TaskManager containers:

  1. Create a configMap with the core-site.xml.
kubectl create configmap hadoop-configmap --from-file [/PATH/TO/CORE-SITE.XML]

Create a Flink cluster

Now you can create a Flink cluster with the Secret and ConfigMap created in the previous steps.

apiVersion: flinkoperator.k8s.io/v1beta1
kind: FlinkCluster
metadata:
  name: my-flinkjobcluster
spec:
  image:
    name: gcr.io/[MY_PROJECT]/flink:[FLINK_VERSION]-scala_[SCALA_VERSION]-gcs
  jobManager:
    ...
  taskManager:
    ...
  job:
    jarFile: gs://my-bucket/my-job.jar
    savepoint: gs://my-bucket/path-to-savepoints/savepoint-1234
    savepointsDir: gs://my-bucket/path-to-savepoints
    autoSavepointSeconds: 300
  hadoopConfig:
    configMapName: hadoop-configmap
    mountPath: /etc/hadoop/conf
  gcpConfig:
    serviceAccount:
      secretName: gcp-service-account-secret
      keyFile: gcp_service_account_key.json
      mountPath: /etc/gcp/keys

Then run:

kubectl apply -f my_flinkjobcluster.yaml

The operator will automatically mount the service account key file to the specified path and set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the key file in the JobManager, TaskManager and Job containers.