Bundle your first configuration

This tutorial creates two small YAML files and uses Config Mate to collect them into one deployable file.

Before you begin

You need Python 3.10 or newer and access to the package registry that provides Config Mate. Install the package in a virtual environment:

python -m pip install config-mate
config-mate --help

1. Create a reusable component

Create components/runtimes.yaml:

python:
  image: python:3.13-slim
  replicas: 2
  healthcheck:
    path: /health
    interval: 30

The top-level python key gives the component a stable name. Other root documents can reuse the same value.

2. Reference the component

Create config.yaml beside the components directory:

version: 1
services:
  orders:
    runtime:
      $ref: components/runtimes.yaml#/python
    port: 8080

The part before # locates the document. The fragment /python is a JSON Pointer selecting the python key in that document.

Your files now look like this:

.
├── components
│   └── runtimes.yaml
└── config.yaml

3. Preview the collected configuration

Run:

config-mate config.yaml

Because no output path or format was specified, Config Mate writes YAML to standard output. The collected document includes the component in place of the reference:

version: 1
services:
  orders:
    runtime:
      image: python:3.13-slim
      replicas: 2
      healthcheck:
        path: /health
        interval: 30
    port: 8080

4. Write a deployable artifact

Create a JSON bundle:

config-mate config.yaml --ext json --output build/config.json

Config Mate creates the build directory if needed. build/config.json is a single file and no longer requires components/runtimes.yaml at runtime.

You have now separated the maintainable source configuration from its portable delivery artifact.

Next steps