vector-im-hydrogen-web/doc/docker.md

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## Warning
Usage of docker is a third-party contribution and not actively tested, used or supported by the main developer(s).
Having said that, you can also use Docker to create a local dev environment or a production deployment.
## Dev environment
In this repository, create a Docker image:
```
docker build -t hydrogen-dev -f Dockerfile-dev .
```
Then start up a container from that image:
```
docker run \
--name hydrogen-dev \
--publish 3000:3000 \
--volume "$PWD":/code \
--interactive \
--tty \
--rm \
hydrogen-dev
```
Then point your browser to `http://localhost:3000`. You can see the server logs in the terminal where you started the container.
To stop the container, simply hit `ctrl+c`.
## Production deployment
### Build or pull image
In this repository, create a Docker image:
```sh
# Enable BuildKit https://docs.docker.com/develop/develop-images/build_enhancements/
export DOCKER_BUILDKIT=1
docker build -t hydrogen .
```
Or, pull the docker image from GitHub Container Registry:
```
docker pull ghcr.io/element-hq/hydrogen-web
docker tag ghcr.io/element-hq/hydrogen-web hydrogen
```
### Start container image
Then, start up a container from that image:
```
docker run \
--name hydrogen \
--publish 8080:8080 \
hydrogen
```
n.b. the image is now based on the unprivileged nginx base, so the port is now `8080` instead of `80` and you need a writable `/tmp` volume.
You can override the default `config.json` using the `CONFIG_OVERRIDE` environment variable. For example to specify a different Homeserver and :
```
docker run \
--name hydrogen \
--publish 8080:8080 \
--env CONFIG_OVERRIDE='{
"push": {
"appId": "io.element.hydrogen.web",
"gatewayUrl": "https://matrix.org",
"applicationServerKey": "BC-gpSdVHEXhvHSHS0AzzWrQoukv2BE7KzpoPO_FfPacqOo3l1pdqz7rSgmB04pZCWaHPz7XRe6fjLaC-WPDopM"
},
"defaultHomeServer": "https://fosdem.org",
"themeManifests": [
"assets/theme-element.json"
],
"defaultTheme": {
"light": "element-light",
"dark": "element-dark"
}
}' \
hydrogen
```