Self-Hosting Impri

Impri is fully self-hostable. docker compose up gives you the complete stack: API server, web inbox, SQLite database, and the watcher scheduler. No licence required, no external services needed to get started.

Requirements

• Docker Engine 24+ and Docker Compose v2
• A machine with at least 256 MB of free RAM (SQLite; a Hetzner CX22 is more than enough)
• (Optional) A domain name and a reverse proxy (Caddy, nginx, Traefik) for HTTPS

Quick start

git clone https://github.com/impri-dev/impri.git
cd impri

# Generate a strong webhook secret (required — do not leave it as "change-me-in-production")
echo "WEBHOOK_SECRET=$(openssl rand -hex 32)" > .env

docker compose up -d

The server is now running:

• API: http://localhost:8484/v1
• Web inbox: http://localhost:8080
• Health check: http://localhost:8484/healthz
• OpenAPI spec: http://localhost:8484/v1/openapi.json

On first start, the bootstrap admin key is printed to the server log. Retrieve it:

docker compose logs server | grep "Admin API Key"

Store this key somewhere safe — it is hashed in the database and will not be shown again.

Environment variables

All configuration is passed via environment variables. The easiest way to manage them is a .env file in the project root (Docker Compose picks it up automatically).

Required

Server

Notifications

Impri can notify you via email (SMTP) and/or ntfy. Both are optional; the server starts without them and falls back to logging the notification.

Email (SMTP):

ntfy (recommended for self-hosters):

ntfy is an open-source push notification service with mobile apps. It works with the public ntfy.sh instance or your own self-hosted ntfy server, and requires no registration for basic use.

Example: to receive notifications at https://ntfy.sh/my-secret-topic-abc123:

NTFY_URL=https://ntfy.sh
NTFY_TOPIC=my-secret-topic-abc123

Install the ntfy app on your phone, subscribe to the topic, and you will receive a push notification for every pending action.

Web push (VAPID) — optional

Browser push notifications for the web inbox. Generate a keypair once and set it in the environment; without these keys the web-push channel is simply off (email / ntfy still work).

npx web-push generate-vapid-keys   # prints a public + private key

Once enabled, open the web inbox and use Enable push notifications in the Notifications section — the browser subscribes and you get a push for every new pending action.

Redis (rate limiter) — optional, multi-instance only

Security

Example .env for a production self-host

WEBHOOK_SECRET=a6f3b2c1d0e9f8a7b6c5d4e3f2a1b0c9d8e7f6a5b4c3d2e1f0a9b8c7d6e5f4
BASE_URL=https://impri.yourdomain.com

# Notifications via ntfy
NTFY_URL=https://ntfy.sh
NTFY_TOPIC=my-secret-topic-abc123

# Email backup notifications
SMTP_HOST=smtp.mailgun.org
SMTP_PORT=587
[email protected]
SMTP_PASS=your-smtp-password
[email protected]
[email protected]

Reverse proxy (HTTPS)

For production use, put a reverse proxy in front that handles TLS. The UI container serves on port 8080 and the API server on 8484. A typical setup proxies both through a single domain:

• https://impri.yourdomain.com → UI (port 8080)
• https://impri.yourdomain.com/v1 → API (port 8484/v1)

Or run them on separate subdomains. The important variable is BASE_URL, which must match the public URL the UI and API are reachable at.

Example Caddy config:

impri.yourdomain.com {
  reverse_proxy /v1/* localhost:8484
  reverse_proxy /* localhost:8080
}

Backups

Impri uses SQLite. The database file is stored in the impri-data Docker volume, mounted at /app/data/impri.db inside the container.

Manual backup:

# Hot backup using SQLite's built-in online backup
docker compose exec server sqlite3 /app/data/impri.db ".backup /app/data/impri-backup-$(date +%Y%m%d).db"

Automated daily backup (cron example):

# /etc/cron.daily/impri-backup
#!/bin/bash
BACKUP_DIR=/var/backups/impri
mkdir -p "$BACKUP_DIR"
docker compose -f /home/impri/docker-compose.yml exec -T server \
  sqlite3 /app/data/impri.db ".backup /tmp/impri-$(date +%Y%m%d).db"
docker compose -f /home/impri/docker-compose.yml cp \
  server:/tmp/impri-$(date +%Y%m%d).db "$BACKUP_DIR/"
# Optionally: rsync to offsite storage

Decisions (what a human approved or rejected) are the most critical data. The database schema stores them in an append-only decisions table with a decisions unique constraint that prevents overwrite.

Upgrading

# Pull the latest images
docker compose pull

# Restart with zero-downtime (the server handles SQLite migrations on startup)
docker compose up -d

There are no manual migration steps for v1 — schema migrations run automatically on startup. Database backups before upgrading are always a good idea.

Monitoring

• Health endpoint: GET /healthz returns {"status":"ok","ts":<unix>} — use it for uptime checks.
• Prometheus metrics: GET /metrics (if enabled in your build — check the deployment).
• Structured logs: the server writes JSON logs via Fastify's built-in logger. API keys are redacted from all log output.

Watcher scheduler

When watchers are enabled (the default), the scheduler polls each active watcher on its configured interval and delivers matching items to your inbox or a webhook. The scheduler runs inside the same server container and requires no external queue.

To disable it (approval inbox only):

DISABLE_WATCHER_SCHEDULER=1

Watcher state is persisted in SQLite. A degraded watcher (3 consecutive failures) is surfaced in the UI and triggers a notification. After 24 hours of failures it is automatically paused.