pobsync/README.md

# pobsync

`pobsync` is a pull-based backup service. It runs on a central backup server and pulls data from remote machines via
rsync over SSH.

The current refactor is SQL-first:

- Django is the management layer and source of truth.
- SQLite is the default database; MariaDB is optional.
- Backups use the existing rsync snapshot engine internally.
- Scheduling is handled by a Django scheduler service, not host cron.
- SSH keys can be managed from Django and selected globally or per host.

## Recommended Production Install

The recommended production deployment is native systemd services on the backup server. Docker Compose remains available
for development and disposable test installs, but native systemd avoids Docker friction around SSH, filesystem mounts,
large backup storage, and host-level service logs.

Recommended layout:

```
/opt/pobsync/app          # installed app checkout
/opt/pobsync/venv         # Python virtualenv
/etc/pobsync/pobsync.env  # settings and secrets
/var/lib/pobsync          # SQLite database, state, runtime SSH key files, static files
/backups                  # backup storage, or set another absolute path
```

From a checked-out copy of this repository, run:

```
sudo scripts/install-systemd
```

The installer will, by default:

- install required Debian/Ubuntu OS packages with `apt-get`
- copy the checkout to `/opt/pobsync/app`
- create `/opt/pobsync/venv`
- write `/etc/pobsync/pobsync.env` if it does not exist
- create `/var/lib/pobsync`, `/var/log/pobsync`, and the backup root
- install Python dependencies
- run migrations and collect static files
- install and start `pobsync-web`, `pobsync-worker`, and `pobsync-scheduler`

Common overrides:

```
sudo scripts/install-systemd \
  --backup-root /mnt/backups/pobsync \
  --allowed-hosts backup.example.com,localhost,127.0.0.1 \
  --csrf-trusted-origins https://backup.example.com
```

Use `--no-install-os-packages` if you want to manage system packages yourself. Use `--force-env` only when you want the
installer to rewrite an existing `/etc/pobsync/pobsync.env`.

For MariaDB support, add:

```
sudo scripts/install-systemd --install-extras mariadb
```

## Services

The installer creates:

- `pobsync-web.service`: Gunicorn Django control panel on `127.0.0.1:8010`
- `pobsync-worker.service`: queued backup worker
- `pobsync-scheduler.service`: SQL-backed schedule dispatcher

Check service state and logs:

```
systemctl status pobsync-web pobsync-worker pobsync-scheduler
journalctl -u pobsync-worker -f
```

Restart after configuration changes:

```
sudo systemctl restart pobsync-web pobsync-worker pobsync-scheduler
```

## Reverse Proxy

Use an existing reverse proxy by forwarding to:

```
http://127.0.0.1:8010
```

To install a starter nginx site file:

```
sudo scripts/install-systemd --with-nginx --server-name backup.example.com
```

For HTTPS behind a reverse proxy, set:

```
POBSYNC_DJANGO_ALLOWED_HOSTS=backup.example.com,localhost,127.0.0.1
POBSYNC_DJANGO_CSRF_TRUSTED_ORIGINS=https://backup.example.com
```

## Django UI

After install, open the control panel through your reverse proxy or directly at:

```
http://127.0.0.1:8010/
```

Create a superuser if needed:

```
sudo -u pobsync /opt/pobsync/venv/bin/python /opt/pobsync/app/manage.py createsuperuser
```

The UI includes:

- dashboard and host detail pages
- global and per-host config forms
- schedule editing
- manual backup queueing
- snapshot discovery
- SQL retention planning and apply flow
- Django-managed SSH keys
- `/self-check/` for runtime checks

## SSH Keys

SSH keys can be managed from `/ssh-credentials/`. Add a private key, optionally paste `known_hosts` entries, and select
the credential either as the global default or as a per-host override.

When a backup starts, the worker writes the selected key to:

```
$POBSYNC_HOME/state/ssh-credentials/<id>/identity
```

The key file is written with `0600` permissions and injected into the rsync SSH command with `IdentityFile`.

## Updates

From a fresh checkout or the existing app directory:

```
git pull
sudo scripts/install-systemd --app-dir /opt/pobsync/app
```

Then check:

```
systemctl status pobsync-web pobsync-worker pobsync-scheduler
```

## Development

Development, Docker, migration helper commands, and architecture notes live in:

- [docs/development.md](docs/development.md)