Quaker

Extend docker-compose by adding support to:

• include files
• run services (and their dependencies) by tag
• automatically detect service directories by git repository

Installation

gem install quaker

Usage

Suppose, you're developing microservices and want to launch all dependencies while working on some service.

Quaker can help you by:

• Better organizing your docker-compose definitions by adding include directive
• Get rid of hard-coded build paths by automatically resolving service directories using the git directive
• Being able to limit the services you want to run with the tag directives

Directory layout

Suppose all your services are located in ~/projects

You'll need the following directory structure to get running:

-projects
  |-| docker
  | |-| services
  |   |- all.yml
  |- warehouse_service
  |- web
  |- billing_service

Here backend, web and background are cloned git repositories you're working on.

You're all.yml file might look like:

---
include:
  - infra.yml
warehouse:
  git: git@github.com:company/warehouse.git
  links:
    - mongo
  tags:
  - backend
  - warehouse
billing:
  git: git@github.com:company/billing.git
  links:
    - postgres
  tags:
  - backend
  - billing
web:
  git: git@github.com:company/web.git
  links:
    - redis
  tags:
  - warehouse
  - billing
  - ui

In your infra.yml file you'll have:

---
redis:
  image: redis
postgres:
  image: postgres
mongo:
  image: mongo

In this case you can generate docker-compose.yml for only the backend services and their dependencies by running:

quaker -t backend

Note: - the generated docker-compose.yml will not include the redis service as it is not a dependency of any service with the backend tag, but will include mongo and postgres even if they don't explicitly have the backend tag.

Then you can feed the generated docker-compose.yml to docker-compose like this:

qaker -t backend | docker-compose -f - up

Roadmap

• Support service templates
• Automatically feed docker-compose with the generated YAML file