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computer-playbook/templates/roles/web-app/config
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Kevin Veen-Birkenbach ff7b7aeb2d feat(filters): add active_docker_container_count filter and use it for fair resource splits 
Compute per-container CPU/RAM shares based on active services (web-/svc-*, enabled=true or undefined). Cast host facts to numbers, add safe min=1, and output compose-ready values. Include robust unit test.

Also: include resource.yml.j2 in base template and minor formatting tidy-up.

https://chatgpt.com/share/68d2d96c-9bf4-800f-bbec-d4f2c0051c06
2025-09-23 21:35:12 +02:00
..
main.yml.j2
feat(filters): add active_docker_container_count filter and use it for fair resource splits
2025-09-23 21:35:12 +02:00
README.md.j2
Replaced web_protocol by WEB_PROTOCOL
2025-08-07 12:31:20 +02:00

README.md.j2

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# Config

The domains defined here can be customized by the system administrator. By default, they’re loaded from `../../group_vars/all/04_applications.yml`, but you can override them per application in your repository:

```yaml
applications:
  {{ application_id }}:
    variable_a: "test string"  # Replaces the default value
    variable_b: {}             # Merges with the existing content
    variable_c: []             # Replaces the default value (use caution with domains)
```

## Placeholder Logic with `<< >>`

You can reference values from the generated `defaults_applications` dictionary at build time by embedding `<< ... >>` placeholders inside your template. For example:

```yaml
url: "{{ WEB_PROTOCOL }}://<< defaults_applications.web-svc-file.domains.canonical[0] >>/assets"
```

- The `<< ... >>` placeholders are resolved by the [`DictRenderer`](../../../utils/dict_renderer.py) helper class.
- The CLI uses the [`DefaultsGenerator`](../../../cli/build/defaults/applications.py) class to merge all role configurations into a single YAML and then calls the renderer to substitute each `<< ... >>` occurrence.
- Use the `--verbose` flag on the CLI script to log every replacement step, and rely on the built‑in timeout (default: 10 seconds) to prevent infinite loops.