v0.2.11 - Picky shit
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systemd/README.md
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systemd/README.md
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# C-Relay Systemd Service
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This directory contains files for running C-Relay as a Linux systemd service.
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## Files
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- **`c-relay.service`** - Systemd service unit file
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- **`install-systemd.sh`** - Installation script (run as root)
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- **`uninstall-systemd.sh`** - Uninstallation script (run as root)
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- **`README.md`** - This documentation file
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## Quick Start
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### 1. Build the relay
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```bash
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# From the project root directory
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make
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```
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### 2. Install as systemd service
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```bash
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# Run the installation script as root
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sudo ./systemd/install-systemd.sh
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```
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### 3. Start the service
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```bash
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sudo systemctl start c-relay
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```
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### 4. Check status
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```bash
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sudo systemctl status c-relay
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```
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## Service Details
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### Installation Location
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- **Binary**: `/opt/c-relay/c_relay_x86`
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- **Database**: `/opt/c-relay/db/`
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- **Service File**: `/etc/systemd/system/c-relay.service`
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### User Account
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- **User**: `c-relay` (system user, no shell access)
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- **Group**: `c-relay`
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- **Home Directory**: `/opt/c-relay`
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### Network Configuration
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- **Default Port**: 8888
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- **Default Host**: 127.0.0.1 (localhost only)
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- **WebSocket Endpoint**: `ws://127.0.0.1:8888`
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## Configuration
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### Environment Variables
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Edit `/etc/systemd/system/c-relay.service` to configure:
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```ini
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Environment=C_RELAY_CONFIG_PRIVKEY=your_private_key_here
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Environment=C_RELAY_PORT=8888
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Environment=C_RELAY_HOST=0.0.0.0
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```
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After editing, reload and restart:
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```bash
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sudo systemctl daemon-reload
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sudo systemctl restart c-relay
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```
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### Security Settings
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The service runs with enhanced security:
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- Runs as unprivileged `c-relay` user
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- No new privileges allowed
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- Protected system directories
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- Private temporary directory
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- Limited file access (only `/opt/c-relay/db` writable)
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- Network restrictions to IPv4/IPv6 only
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## Service Management
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### Basic Commands
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```bash
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# Start service
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sudo systemctl start c-relay
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# Stop service
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sudo systemctl stop c-relay
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# Restart service
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sudo systemctl restart c-relay
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# Enable auto-start on boot
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sudo systemctl enable c-relay
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# Disable auto-start on boot
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sudo systemctl disable c-relay
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# Check service status
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sudo systemctl status c-relay
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# View logs (live)
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sudo journalctl -u c-relay -f
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# View logs (last 100 lines)
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sudo journalctl -u c-relay -n 100
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```
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### Log Management
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Logs are handled by systemd's journal:
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```bash
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# View all logs
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sudo journalctl -u c-relay
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# View logs from today
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sudo journalctl -u c-relay --since today
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# View logs with timestamps
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sudo journalctl -u c-relay --since "1 hour ago" --no-pager
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```
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## Database Management
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The database is automatically created on first run. Location: `/opt/c-relay/db/c_nostr_relay.db`
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### Backup Database
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```bash
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sudo cp /opt/c-relay/db/c_nostr_relay.db /opt/c-relay/db/backup-$(date +%Y%m%d).db
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```
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### Reset Database
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```bash
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sudo systemctl stop c-relay
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sudo rm /opt/c-relay/db/c_nostr_relay.db*
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sudo systemctl start c-relay
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```
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## Updating the Service
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### Update Binary
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1. Build new version: `make`
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2. Stop service: `sudo systemctl stop c-relay`
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3. Replace binary: `sudo cp build/c_relay_x86 /opt/c-relay/`
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4. Set permissions: `sudo chown c-relay:c-relay /opt/c-relay/c_relay_x86`
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5. Start service: `sudo systemctl start c-relay`
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### Update Service File
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1. Stop service: `sudo systemctl stop c-relay`
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2. Copy new service file: `sudo cp systemd/c-relay.service /etc/systemd/system/`
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3. Reload systemd: `sudo systemctl daemon-reload`
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4. Start service: `sudo systemctl start c-relay`
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## Uninstallation
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Run the uninstall script to completely remove the service:
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```bash
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sudo ./systemd/uninstall-systemd.sh
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```
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This will:
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- Stop and disable the service
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- Remove the systemd service file
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- Optionally remove the installation directory
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- Optionally remove the `c-relay` user account
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## Troubleshooting
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### Service Won't Start
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```bash
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# Check detailed status
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sudo systemctl status c-relay -l
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# Check logs for errors
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sudo journalctl -u c-relay --no-pager -l
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```
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### Permission Issues
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```bash
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# Fix ownership of installation directory
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sudo chown -R c-relay:c-relay /opt/c-relay
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# Ensure binary is executable
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sudo chmod +x /opt/c-relay/c_relay_x86
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```
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### Port Already in Use
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```bash
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# Check what's using port 8888
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sudo netstat -tulpn | grep :8888
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# Or with ss command
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sudo ss -tulpn | grep :8888
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```
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### Database Issues
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```bash
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# Check database file permissions
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ls -la /opt/c-relay/db/
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# Check database integrity
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sudo -u c-relay sqlite3 /opt/c-relay/db/c_nostr_relay.db "PRAGMA integrity_check;"
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```
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## Custom Configuration
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For advanced configurations, you can:
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1. Modify the service file for different ports or settings
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2. Use environment files: `/etc/systemd/system/c-relay.service.d/override.conf`
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3. Configure log rotation with journald settings
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4. Set up reverse proxy (nginx/apache) for HTTPS support
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## Security Considerations
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- The service runs as a non-root user with minimal privileges
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- Database directory is only writable by the c-relay user
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- Consider firewall rules for the relay port
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- For internet-facing relays, use reverse proxy with SSL/TLS
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- Monitor logs for suspicious activity
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