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deployer

This is a service that automates deployment of our services so that the services themself can trigger a deployment while still preserving least privileges (e.g. not having root accesses).

It will update and deploy the Ansible playbook defined in https://github.com/blindern/drift/tree/main/ansible

The service exposes a JSON API that is used like this:

POST /deploy
{
  "service": "service-name",
  "attributes": {
    "image": "hello-world"
  },
  "forceDeploy": false
}

Configured services is located at https://github.com/blindern/drift/blob/main/ansible/roles/service-deployer/files/services.json

The request will block until it has completed deployment. On failure a 500 error will be given.

Authorization is based on pre-configured tokens.

Development

This has been built with Python 3.12.

You need Poetry. See https://python-poetry.org/docs/#installation

Copy .env.template to .env and modify it to your needs.

You need to have a SSH key active that can be used to pull and push the drift repo, as well as having root access to all the servers (for Ansible).

poetry install
FLASK_APP=deployer.app poetry run flask run

To run tests:

poetry run pytest

Lint/fix all files:

poetry run pre-commit run --all-files

Testing locally

curl -i -H "authorization: bearer abc" -H "content-type: application/json" -X POST http://localhost:5000/deploy -d '
{
  "service": "CHANGEME",
  "attributes": {
    "image": "CHANGEME"
  }
}'

How a deployment is done

When the application is invoked it will:

  1. Pull drift repo
  2. Check if config actually changes - abort if not (same version) - this will give a OK response
  3. Bump config value
  4. Deploy Ansible playbook with specific tag
  5. Commit and push changes

The application is run as a single instance, and keeps a lock to prevent concurrent deployments of the same service.