Build Dataproc custom images

This page describes how to generate a custom Dataproc image.

Important notes

To help ensure that clusters receive the latest service updates and bug fixes, the creation of clusters with a custom image is limited to 365 days from the image creation date, but existing custom-image clusters can run indefinitely. Automation to continuously build a custom image may be necessary if you wish to create clusters with a custom image for a period greater than 365 days.

Creating clusters with expired custom images is possible by following these instructions, but Cloud Dataproc cannot guarantee support of issues that arise with these clusters.

Requirements

1. Python 2.7+.
2. gcloud 181.0.0 (2017-11-30).
3. Bash 3.0.
4. A GCE project with billing, Google Cloud Dataproc API, Google Compute Engine API, and Google Cloud Storage APIs enabled.
5. Use gcloud config set project <your-project> to specify which project to use to create and save your custom image.

Generate custom image

To generate a custom image, you can run the following command:

python generate_custom_image.py \
    --image-name '<new_custom_image_name>' \
    --dataproc-version '<dataproc_version>' \
    --customization-script '<custom_script_to_install_custom_packages>' \
    --zone '<zone_to_create_instance_to_build_custom_image>' \
    --gcs-bucket '<gcs_bucket_to_write_logs>'

Arguments

• --image-name: The name for custom image.
• --dataproc-version: The Dataproc version for this custom image to build on. Examples: 1.5.9-debian10, 1.5.0-RC10-debian10, 1.5.9-ubuntu18. If the sub-minor version is unspecified, the latest available one will be used. Examples: 1.5-centos8, 2.0-debian10. For a complete list of Dataproc image versions, please refer to Dataproc release notes. To understand Dataproc versioning, please refer to documentation. This argument is mutually exclusive with --base-image-uri and --source-image-family.
• --base-image-uri: The full image URI for the base Dataproc image. The customization script will be executed on top of this image instead of an out-of-the-box Dataproc image. This image must be a valid Dataproc image. This argument is mutually exclusive with --dataproc-version and --source-image-family.
• --base-image-family: The image family that the boot disk will be initialized with. The latest non-deprecated image from the family will be used. An example base image family URI is projects/PROJECT_NAME/global/images/family/<FAMILY_NAME>. To get the list of image families (and the associated image), run gcloud compute images list [--project <PROJECT_NAME>]. This argument is mutually exclusive with --dataproc-version and --base-image-uri.
• --customization-script: The script used to install custom packages on the image.
• --zone: The GCE zone for running your GCE instance.
• --gcs-bucket: A GCS bucket to store the logs of building custom image.

Optional Arguments

• --family: The family of the source image. This will cause the latest non-deprecated image in the family to be used as the source image.
• --project-id: The project Id of the project where the custom image is created and saved. The default project Id is the current project id specified in gcloud config get-value project.
• --oauth: The OAuth credential file used to call Google Cloud APIs. The default OAuth is the application-default credentials from gcloud.
• --machine-type: The machine type used to build custom image. The default is n1-standard-1.
• --no-smoke-test: This parameter is used to disable smoke testing the newly built custom image. The smoke test is used to verify if the newly built custom image can create a functional Dataproc cluster. Disabling this step will speed up the custom image build process; however, it is not advised. Note: The smoke test will create a Dataproc cluster with the newly built image, runs a short job and deletes the cluster in the end.
• --network: This parameter specifies the GCE network to be used to launch the GCE VM instance which builds the custom Dataproc image. The default network is 'global/networks/default'. If the default network does not exist in your project, please specify a valid network interface. For more information on network interfaces, please refer to GCE VPC documentation.
• --subnetwork: This parameter specifies the subnetwork that is used to launch the VM instance that builds the custom Dataprocimage. A full subnetwork URL is required. The default subnetwork is None. For more information, please refer to GCE VPC documentation.
• --no-external-ip: This parameter is used to disables external IP for the image build VM. The VM will not be able to access the internet, but if Private Google Access is enabled for the subnetwork, it can still access Google services (e.g., GCS) through internal IP of the VPC.
• --service-account: The service account that is used to launch the VM instance that builds the custom Dataproc image. The scope of this service account is defaulted to "/auth/cloud-platform", which authorizes VM instance the access to all cloud platform services that is granted by IAM roles. Note: IAM role must allow the VM instance to access GCS bucket in order to access scripts and write logs.
• --extra-sources: Additional files/directories uploaded along with customization script. This argument is evaluated to a json dictionary.
• --disk-size: The size in GB of the disk attached to the VM instance used to build custom image. The default is 20 GB.
• --accelerator: The accelerators (e.g. GPUs) attached to the VM instance used to build custom image. This flag supports the same values as gcloud compute instances create --accelerator flag. By default no accelerators are attached.
• --base-image-uri: The partial image URI for the base Dataproc image. The customization script will be executed on top of this image instead of an out-of-the-box Dataproc image. This image must be a valid Dataproc image. The format of the partial image URI is the following: projects/<project_id>/global/images/<image_name>.
• --storage-location: The storage location (e.g. US, us-central1) of the custom GCE image. This flag supports the same values as gcloud compute images create --storage-location flag. If not specified, the default GCE image storage location is used.
• --shutdown-instance-timer-sec: The time to wait in seconds before shutting down the VM instance. This value may need to be increased if your init script generates a lot of output on stdout. If not specified, the default value of 300 seconds will be used.
• --dry-run: Dry run mode which only validates input and generates workflow script without creating image. Disabled by default.
• --metadata: VM metadata which can be read by the customization script with /usr/share/google/get_metadata_value attributes/<key> at runtime. The value of this flag takes the form of key1=value1,key2=value2,.... If the value includes special characters (e.g., =, , or spaces) which needs to be escaped, consider encoding the value, then decode it back in the customization script. See more information about VM metadata on https://cloud.google.com/sdk/gcloud/reference/compute/instances/create.

Overriding cluster properties with a custom image

You can use custom images to overwrite any cluster properties set during cluster creation. If a user creates a cluster with your custom image but sets cluster properties different from those you set with your custom image, your custom image cluster property settings will take precedence.

To set cluster properties with your custom image:

In your custom image customization script, create a dataproc.custom.properties file in /etc/google-dataproc, then set cluster property values in the file.

• Sample dataproc.custom.properties file contents:

  dataproc.conscrypt.provider.enable=true
  dataproc.logging.stackdriver.enable=false

• Sample customization script file-creation snippet to override two cluster properties:

  cat <<EOF >/etc/google-dataproc/dataproc.custom.properties
  dataproc.conscrypt.provider.enable=true
  dataproc.logging.stackdriver.enable=false EOF

Examples

Create a custom image

Create a custom image with name custom-image-1-5-9 with Dataproc version 1.5.9-debian10:

python generate_custom_image.py \
    --image-name custom-image-1-5-9 \
    --dataproc-version 1.5.9-debian10 \
    --customization-script ~/custom-script.sh \
    --metadata 'key1=value1,key2=value2' \
    --zone us-central1-f \
    --gcs-bucket gs://my-test-bucket

Create a custom image without running smoke test

python generate_custom_image.py \
    --image-name custom-image-1-5-9 \
    --dataproc-version 1.5.9-debian10 \
    --customization-script ~/custom-script.sh \
    --zone us-central1-f \
    --gcs-bucket gs://my-test-bucket \
    --no-smoke-test