# Deploying on a KIT HPC login node (no Docker daemon)

This path is for machines like the ETP login nodes: `/ceph`, `/work`, `/web` are
mounted directly, but there's no Docker daemon available, and your `public_html`
is already served by KIT's own web infrastructure — so no web server needs to
run here at all, only the generator on a schedule.

## 1. Install into a venv

```bash
python3 -m venv ~/.venvs/gallery
~/.venvs/gallery/bin/pip install -e /work/lbogner/ETPlot   # path to your clone
```

PyMuPDF (a base dependency) handles PDF→PNG conversion; ImageMagick is not required.

## 2. Point a config at your paths

Copy/edit `config.lbogner.yaml` from the repo root (already has `web_folder:
/web/lbogner/public_html/` and placeholder `sources:` — fill in the real
plot-output directories under `/work/lbogner/...` or `/ceph/...`). Put it
wherever you like, e.g. `~/gallery/config.lbogner.yaml`, and adjust the path in
`gallery-generate.service` if you move it.

## 3. Install the systemd --user timer

```bash
mkdir -p ~/.config/systemd/user
cp deploy/systemd/gallery-generate.{service,timer} ~/.config/systemd/user/
systemctl --user daemon-reload
systemctl --user enable --now gallery-generate.timer
```

Check status/logs:

```bash
systemctl --user list-timers gallery-generate.timer
journalctl --user -u gallery-generate.service -f
```

By default a user's systemd instance (and its timers) stops when you log out.
Enable lingering so it keeps running:

```bash
loginctl enable-linger $USER
```

If lingering isn't permitted on your login node, or `systemctl --user` isn't
usable there at all, fall back to a crontab entry instead:

```
*/5 * * * * ~/.venvs/gallery/bin/gallery --config ~/gallery/config.lbogner.yaml generate >> ~/gallery-generate.log 2>&1
```

## Why not the Docker Compose stack?

`docker-compose.yml` at the repo root (generator + nginx) is for a scenario
where you control a dedicated VM/server and need to serve the output yourself.
On the ETP login nodes there's no Docker daemon (Apptainer/Singularity only),
and `public_html` is already auto-served — running your own nginx there would
be redundant. Docker is still used for CI (`.gitlab-ci.yml`) and remains a fine
option for anyone deploying this on their own server.