Terra

Terra is a fully managed bioinformatics platform powered by Google Cloud Platform and Cromwell, with native support for WDL workflows. This guide demonstrates running the 02_download_collection_files.wdl workflow in Terra, typically taking 5-10 minutes to complete.

Prerequisites

Before starting, you'll need:

• Google Account

• Google Cloud Platform Account (includes $300 free compute credit for 90-day trial)

• Terra Account

• Optional: git

Refer to Terra's getting started guide for linking your GCP account and billing information.

Initial Setup

Get the Example Workflow

Download the worked examples repository containing 02_download_collection_files.wdl:

Clone with Git

git clone https://github.com/DNAstack/dnastack-client-library-worked-examples.git

Or Download and Unzip

Create a workspace that will house the workflow and output files. A cloud environment is not needed to run WDL workflows and can be skipped when prompted.

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Importing a workflow

• Navigate to "Workflows" and select "Find a Workflow"

• Select "Broad Methods Repository" and log in with your Google account

• Choose "Create New Method"

• Upload 02_download_collection_files.wdl or paste its contents

• Export to your Terra workspace using Blank Configuration

Running a workflow

• Return to your workspace and select your workflow

• Choose "Run workflow with inputs defined by file paths"

• Click "Run Analysis" to begin execution

• Monitor progress in the "Job History" tab

• Access completed files in the "Data" tab under Files

Downloading files from Terra's Google Cloud Bucket may incur charges based on file size.