RASCSI/docker/README.md

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# Docker Environment for Development and Testing
⚠️ **Important:** The Docker environment is unable to connect to the PiSCSI board and is
intended for development and testing purposes only. To setup PiSCSI on a Raspberry Pi
refer to the [setup instructions](https://github.com/PiSCSI/piscsi/wiki/Setup-Instructions)
on the wiki instead.
## Introduction
This documentation currently focuses on using Docker for developing and testing the web UI.
Additions, amendments and contributions for additional workflows are most welcome.
## Getting Started
The easiest way to launch a new environment is to use Docker Compose.
```
cd docker
docker compose up
```
Containers will be built and started for the PiSCSI server and the web UI.
The web UI can be accessed at:
* http://localhost:8080
* https://localhost:8443
To stop the containers, press *Ctrl + C*, or run `docker compose stop`
from another terminal.
## Environment Variables
The following environment variables are available when using Docker Compose:
| Environment Variable | Default |
| -------------------- |----------|
| `OS_VERSION` | bullseye |
| `WEB_HTTP_PORT` | 8080 |
| `WEB_HTTPS_PORT` | 8443 |
| `WEB_LOG_LEVEL` | info |
| `BACKEND_HOST` | backend |
| `BACKEND_PORT` | 6868 |
| `BACKEND_PASSWORD` | *[None]* |
| `BACKEND_LOG_LEVEL` | debug |
**Examples:**
Run Debian "bullseye":
```
OS_VERSION=bullseye docker compose up
```
Start the web UI with the log level set to debug:
```
WEB_LOG_LEVEL=debug docker compose up
```
## Volumes
When using Docker Compose the following volumes will be mounted automatically:
| Local Path | Container Path |
| ----------------------- | ------------------------ |
| docker/volumes/images/ | /home/pi/images/ |
| docker/volumes/config/ | /home/pi/.config/piscsi/ |
## How To
### Rebuild Containers
You should rebuild the container images after checking out a different version of
PiSCSI or making changes which affect the environment at build time, e.g.
`easyinstall.sh`.
```
docker compose up --build
```
### Open a Shell on a Running Container
Run the following command, replacing `[CONTAINER]` with `backend` or `web`.
```
docker compose exec [CONTAINER] bash
```
### Setup Live Editing for the Web UI
Use a `docker-compose.override.yml` to mount the local `python` directory to
`/home/pi/piscsi/python/` in the `web` container.
Any changes to *.py files on the host computer (i.e. in your IDE) will trigger
the web UI process to be restarted in the container.
**Example:**
```
services:
web:
volumes:
- ../python:/home/pi/piscsi/python:delegated
```
### Connect the Web UI to a Real PiSCSI
This can be useful for testing, but there are some caveats, e.g. the PiSCSI and the
web UI will be accessing separate `images` directories.
```
BACKEND_HOST=foo BACKEND_PASSWORD=bar docker compose up
```