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Taskcluster AWS Provisioner

Build Status NOTE Travis being green does not mean that we're good to deploy to production!

The AWS Provisioner is responsible for starting Amazon EC2 instances to perform tasks in the Taskcluster queue. It monitors queue lengths and uses spot bidding to maximize the cost-effectiveness of its resources.

Hacking AWS Provisioner

You will need Node 4 to run the AWS provisioner. With this in place, a simple npm install should fetch the prerequisites.


To test, you will need a set of credentials. The best way to find these is to ask another developer for a copy of theirs. The configuration should look something like that in user-config-example.yml.

You can create your own pulse credentials at You'll need to get the Azure configuration from another Taskcluster developer. The AWS user can be found in the shared notes in Lastpass.

The unit test suite only covers the API of the provisioner. Changes to the backend require manual testing. Do not take travis status to mean that changes are working.

Running Locally

To run the provisioner locally, you will need a similar set of configuration. Then run:

npm run compile && NODE_ENV=development DEBUG=* node lib/main.js server # just web server
npm run compile && NODE_ENV=development DEBUG=* node lib/main.js all    # web + provisioner

Note that this is not usually the best way to test the provisioner. Be careful that you manually destroy any resources the provisioner creates while it is running (EC2 instances, spot bids, and SSH keypairs).

Deploying AWS Provisioner

This app is part of the 'provisioner' pipeline.


Environment Staging Production
provisionerId staging-aws aws-provisioner-v1
Web Administration
Base URL (API requests)
Deployment Method Automatic from master branch Manual

Post Deployment Verification

The provisioner is deployed on heroku as a worker process and a web process. A deployment of the provisioner is made by pushing a commit to the master branch, either through the command line or through merging a pull request. Before doing a deployment, you should run the unit tests locally.

Once the deployment is made, you should use the heroku logs -t command to verify that no exceptions are being thrown and that a complete provisioning iteration happens. If the deployment is about adding a new feature or correcting a bug, it would be a good idea to ensure that logging messages confirm the fix.

The unit test suite in the provisioner is limited to the web component. The EC2 api's eventual consistency as well as it taking sometimes more than 20 minutes to launch an instance mean that integration tests for the EC2 interactions are not very feasible.

Service Owner

Service Owner:


AWS Provisioner for Taskcluster




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