pad/docs/deployment.md

Deployment Guide

Pad is a single Go binary with an embedded web UI. It supports SQLite (default) for single-node deployments and PostgreSQL + Redis for production multi-node setups.

Architecture

                    ┌─────────────────┐
                    │  Reverse Proxy  │
                    │  (Caddy/nginx)  │
                    └────────┬────────┘
                             │ :443
                    ┌────────▼────────┐
                    │      Pad        │
                    │   Go binary     │
                    │  (web UI + API) │
                    └──┬──────────┬───┘
                       │          │
              ┌────────▼──┐  ┌───▼────────┐
              │ PostgreSQL │  │   Redis    │
              │ (storage)  │  │ (pub/sub)  │
              └────────────┘  └────────────┘

• Pad serves the REST API and embedded SvelteKit web UI on a single port (default: 7777)
• PostgreSQL stores all data (workspaces, items, users, activity). SQLite works for single-node.
• Redis enables real-time SSE events across multiple Pad instances. Optional for single-node.

Quick Start with Docker Compose

# Clone the repo
git clone https://github.com/xarmian/pad.git
cd pad

# Start everything (Pad + PostgreSQL + Redis)
docker compose up -d

# Check status
docker compose ps

# View logs
docker compose logs -f pad

Access the web UI at http://localhost:7777. On first visit, you'll be prompted to create an admin account.

Production Docker Compose

# Use the production overlay for resource limits and secure settings
docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d

Edit docker-compose.prod.yml to set your domain, email credentials, and database password.

Environment Variables

All configuration is via environment variables or a config file (~/.pad/config.toml / /data/config.toml).

Core

Variable	Default	Description
PAD_HOST	127.0.0.1	Listen address (0.0.0.0 for Docker/production)
PAD_PORT	7777	Listen port
PAD_URL	—	Public-facing base URL (e.g., https://pad.example.com). Used for invitation links.
PAD_DATA_DIR	~/.pad	Data directory for SQLite DB, logs, and config
PAD_LOG_LEVEL	info	Log level: debug, info, warn, error
PAD_MODE	local	Mode: local, remote, docker, cloud

Database

Variable	Default	Description
PAD_DB_DRIVER	sqlite	Database driver: sqlite or postgres
PAD_DB_PATH	~/.pad/pad.db	SQLite database path (ignored when using PostgreSQL)
PAD_DATABASE_URL	—	PostgreSQL connection string (required when PAD_DB_DRIVER=postgres)

Real-time Events

Variable	Default	Description
PAD_REDIS_URL	—	Redis URL for cross-instance pub/sub. Without Redis, SSE events are in-process only.
PAD_SSE_MAX_CONNECTIONS	1000	Global maximum SSE connections
PAD_SSE_MAX_PER_WORKSPACE	100	Per-workspace maximum SSE connections

Security

Variable	Default	Description
PAD_SECURE_COOKIES	false	Set Secure flag on session cookies (requires TLS)
PAD_CORS_ORIGINS	—	Comma-separated allowed CORS origins

Email (Optional)

Email enables sending workspace invitation links. Without it, users can still join via CLI invite codes.

Variable	Default	Description
PAD_MAILEROO_API_KEY	—	Maileroo sending API key
PAD_EMAIL_FROM	noreply@getpad.dev	Sender email address
PAD_EMAIL_FROM_NAME	Pad	Sender display name

Deployment Options

Single Binary (SQLite)

The simplest deployment — one binary, one file for the database.

# Download or build
make build

# Run directly
PAD_HOST=0.0.0.0 ./pad server start

# Or install as a systemd service (see below)

Best for: single-user, small teams, evaluations.

Docker Compose (PostgreSQL + Redis)

See Quick Start above. This is the recommended setup for teams.

Kubernetes

Manifests are in deploy/k8s/. Apply them in order:

# Create namespace
kubectl apply -f deploy/k8s/namespace.yaml

# Configure secrets (edit first!)
kubectl apply -f deploy/k8s/secret.yaml

# Deploy
kubectl apply -f deploy/k8s/configmap.yaml
kubectl apply -f deploy/k8s/deployment.yaml
kubectl apply -f deploy/k8s/service.yaml
kubectl apply -f deploy/k8s/ingress.yaml
kubectl apply -f deploy/k8s/hpa.yaml

Prerequisites:

• External PostgreSQL (e.g., AWS RDS, Cloud SQL, managed PG)
• External Redis (e.g., ElastiCache, Memorystore)
• Ingress controller (nginx-ingress or similar)
• TLS certificates (cert-manager recommended)

Systemd Service

# /etc/systemd/system/pad.service
[Unit]
Description=Pad
After=network.target postgresql.service redis.service

[Service]
Type=simple
User=pad
Group=pad
ExecStart=/usr/local/bin/pad server start
Environment=PAD_HOST=0.0.0.0
Environment=PAD_DATA_DIR=/var/lib/pad
Environment=PAD_DB_DRIVER=postgres
Environment=PAD_DATABASE_URL=postgres://pad:secret@localhost:5432/pad
Environment=PAD_REDIS_URL=redis://localhost:6379
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl enable --now pad

Reverse Proxy

Pad needs a reverse proxy for TLS termination. SSE connections require specific proxy settings to avoid buffering.

Caddy (Recommended)

Caddy handles TLS automatically. See deploy/Caddyfile:

pad.example.com {
    reverse_proxy pad:7777 {
        flush_interval -1
    }
}

nginx

See deploy/nginx.conf. Critical settings for SSE:

location /api/v1/events {
    proxy_buffering off;
    proxy_cache off;
    proxy_read_timeout 86400s;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
}

Monitoring

Pad exposes Prometheus metrics at /metrics (unauthenticated). Key metrics:

Metric	Type	Description
pad_http_requests_total	counter	Total HTTP requests by method, path, status
pad_http_request_duration_seconds	histogram	Request latency
pad_http_response_size_bytes	histogram	Response body sizes
pad_sse_connections_active	gauge	Current SSE connections
pad_eventbus_publish_total	counter	Events published
pad_eventbus_subscribers	gauge	Active event subscribers
pad_db_open_connections	gauge	Database connection pool stats

Health Check

curl http://localhost:7777/api/v1/health
# {"status":"ok"}

Production Checklist

• Database: PostgreSQL configured with PAD_DB_DRIVER=postgres
• Redis: Connected for multi-instance SSE (PAD_REDIS_URL)
• TLS: Reverse proxy with valid certificates
• Secure cookies: PAD_SECURE_COOKIES=true (requires TLS)
• Public URL: PAD_URL set to your public-facing domain
• CORS: PAD_CORS_ORIGINS set if serving from a different domain
• Backups: PostgreSQL backup strategy in place (see docs/backup.md)
• Monitoring: Prometheus scraping /metrics
• Admin account: Created via pad auth setup or web UI on first visit
• Email (optional): Maileroo configured for invitation emails
• Resource limits: Set in Docker Compose or K8s manifests
• Log level: PAD_LOG_LEVEL=info (use debug only for troubleshooting)