.. _containerization:

================
Containerization
================

Web Reflectivity runs in Docker containers.
The application is loosely coupled to ancillary services and easily deployable.

A quick look to file `docker-compose.local.yml` shows the following images to be generated:

- **web** runs the Web Reflectivity app. Image is built to use the host's network.
- **db** runs the posgreSQL database storing Web Reflectivity data like models and fits
- **redis** runs the queue manager, where fitting jobs requested by the user are queued as tasks to be run later.
- **nginx** runs the reverse proxy engine serving Web Reflectivity to the WWW
- **worker** runs the fitting engine `refl1D`.
  This image is used only when running in the developer's workstation.


Docker Volumes
--------------

Each image mentioned above uses volumes to mount certain directories or configuration files to the appropriate system location.

Named volumes:

- **web-static** is used by `webref` and `nginx` and is mounted to `/var/www/web_reflectivity/static`
- **pgdata** is used by `db` and is mounted to `/var/lib/postgresql/data`

Each image will mount its component logs to `/var/log`.