Distributed-CellProfiler

Run encapsulated docker containers with CellProfiler in the Amazon Web Services infrastructure.

This code is an example of how to use AWS distributed infrastructure for running CellProfiler. The configuration of the AWS resources is done using fabric. The worker is written in Python and is encapsulated in a docker container. There are four AWS components that are needed to run distributed jobs:

An SQS queue
An ECS cluster
An S3 bucket
A spot fleet of EC2 instances

All of them can be managed through the AWS Management Console. However, this code helps to get started quickly and run a job autonomously if all the configuration is correct. The code includes a fabric script that links all these components and prepares the infrastructure to run a distributed job. When the job is completed, the code is also able to stop resources and clean up components.

Running the code

Step 1

Edit the config.py file with all the relevant information for your job. Then, start creating the basic AWS resources by running the following script:

$ fab setup

This script intializes the resources in AWS. Notice that the docker registry is built separately, and you can modify the worker code to build your own. Anytime you modify the worker code, you need to update the docker registry using the Makefile script inside the worker directory.

Step 2

After the first script runs successfully, the job can now be submitted to AWS using the following command:

$ python run.py submitJob files/exampleJob.json

This uploads the tasks that are configured in the json file. This assumes that your data is stored in S3, and the json file has the paths to find input and output directories. You have to customize the exampleJob.json file with paths that make sense for your project. Also, the tasks that compose your job are CP groups, and each one will be run in parallel. You need to define each task in this json file to guide the parallelization.

Step 3

After submitting the job to the queue, we can add computing power to process all tasks in AWS. This code starts a fleet of spot EC2 instances which will run the worker code. The worker code is encapsulated in docker containers, and the code uses ECS services to inject them in EC2. All this is automated with the following command:

$ python run.py startCluster files/exampleFleet.json

The exampleFleet.json file has to be updated to determine the type of EC2 instances that you want and how much you are willing to pay for each machine-hour. Make sure to adjust the values in this json file according to your application. After the cluster is ready, the code informs you that everything is setup, and saves the spot fleet identifier in a file for further references.

Step 4

When the cluster is up and running, you can monitor progress using the following command:

$ python run.py monitor files/APP_NAMESpotFleetRequestId.json

The file APP_NAMESpotFleetRequestId.json is created after the cluster is setup in step 3. It is important to keep this monitor running if you want to automatically shutdown computing resources when there are no more tasks in the queue (recommended).