Tunnel (Tailscale)

Remote access to Dagu via embedded Tailscale node. No port forwarding, firewall rules, or VPN setup required.

Architecture

How it works:

1. Dagu starts an embedded Tailscale node using tsnet
2. The node joins your Tailscale network (tailnet)
3. A reverse proxy forwards requests to the local Dagu server
4. Access via http://dagu.<your-tailnet>.ts.net

Quick Start

dagu server --tunnel

First run:

To start this tsnet server, go to: https://login.tailscale.com/a/abc123

Click the URL to authorize. Credentials are saved for subsequent runs.

Access:

http://dagu.<your-tailnet>.ts.net

CLI Flags

Flag	Type	Default	Description
--tunnel, -t	bool	false	Enable tunnel mode
--tunnel-token	string	""	Tailscale auth key for headless login
--tunnel-funnel	bool	false	Enable public internet access
--tunnel-https	bool	false	Use HTTPS (requires admin setup)

Configuration File

# ~/.config/dagu/config.yaml
tunnel:
  enabled: true

  tailscale:
    # Auth key for headless authentication (optional)
    # Generate at: https://login.tailscale.com/admin/settings/keys
    authKey: "tskey-auth-xxxxx"

    # Machine name in tailnet (default: "dagu")
    hostname: "dagu"

    # Enable Tailscale Funnel for public access
    funnel: false

    # Use HTTPS for tailnet-only access
    https: false

    # State directory (default: ~/.dagu_data/tailscale)
    stateDir: ""

  # Allow terminal access via tunnel (default: false)
  allowTerminal: false

  # IP allowlist (empty = allow all)
  allowedIPs: []

  # Rate limiting for authentication
  rateLimiting:
    enabled: false
    loginAttempts: 5        # Max attempts per window
    windowSeconds: 300      # 5 minutes
    blockDurationSeconds: 900  # 15 minutes

Environment Variables

Variable	Config Key
DAGU_TUNNEL_ENABLED	tunnel.enabled
DAGU_TUNNEL_TAILSCALE_AUTH_KEY	tunnel.tailscale.authKey
DAGU_TUNNEL_TAILSCALE_HOSTNAME	tunnel.tailscale.hostname
DAGU_TUNNEL_TAILSCALE_FUNNEL	tunnel.tailscale.funnel
DAGU_TUNNEL_TAILSCALE_HTTPS	tunnel.tailscale.https
DAGU_TUNNEL_TAILSCALE_STATE_DIR	tunnel.tailscale.stateDir
DAGU_TUNNEL_ALLOW_TERMINAL	tunnel.allowTerminal
DAGU_TUNNEL_RATE_LIMITING_ENABLED	tunnel.rateLimiting.enabled
DAGU_TUNNEL_RATE_LIMITING_LOGIN_ATTEMPTS	tunnel.rateLimiting.loginAttempts
DAGU_TUNNEL_RATE_LIMITING_WINDOW_SECONDS	tunnel.rateLimiting.windowSeconds
DAGU_TUNNEL_RATE_LIMITING_BLOCK_DURATION_SECONDS	tunnel.rateLimiting.blockDurationSeconds

Modes

Default: HTTP (Tailnet Only)

dagu server --tunnel

Property	Value
URL	http://dagu.<tailnet>.ts.net
Port	80
Encryption	WireGuard (network layer)
Access	Tailnet devices only
Setup	None

Traffic is encrypted by WireGuard. HTTP is used because TLS on top of WireGuard is redundant.

HTTPS (Tailnet Only)

dagu server --tunnel --tunnel-https

Property	Value
URL	https://dagu.<tailnet>.ts.net
Port	443
Encryption	WireGuard + TLS
Access	Tailnet devices only
Setup	Enable HTTPS in Tailscale admin

Setup:

1. Go to https://login.tailscale.com/admin/dns
2. Enable "HTTPS Certificates"

Funnel: Public Internet

dagu server --tunnel --tunnel-funnel

Property	Value
URL	https://dagu.<tailnet>.ts.net
Port	443
Encryption	TLS
Access	Anyone on internet
Setup	Enable Funnel in Tailscale admin

Setup:

1. Go to https://login.tailscale.com/admin/acls
2. Add to policy:

{
  "nodeAttrs": [
    {
      "target": ["*"],
      "attr": ["funnel"]
    }
  ]
}

Authentication Required

When using Funnel, ensure authentication is enabled:

server:
  auth:
    mode: builtin  # or oidc

Authentication Flow

Interactive Login (Default)

1. Start server
   $ dagu server --tunnel

2. Server prints login URL
   To start this tsnet server, go to: https://login.tailscale.com/a/abc123

3. Click URL → Authorize in browser

4. State saved to ~/.dagu_data/tailscale/tailscaled.state

5. Subsequent runs auto-connect (no login needed)

Headless Login (Auth Key)

For automated deployments without interactive login:

# Generate auth key at https://login.tailscale.com/admin/settings/keys
dagu server --tunnel --tunnel-token=tskey-auth-kxxxxxxx

Or via environment:

export DAGU_TUNNEL_TAILSCALE_AUTH_KEY=tskey-auth-kxxxxxxx
dagu server --tunnel

File Locations

~/.dagu_data/
├── tailscale/
│   └── tailscaled.state   # Persistent auth credentials
└── tunnel_url             # Last known tunnel URL

API Endpoint

GET /api/v2/services/tunnel

Response:

{
  "enabled": true,
  "provider": "tailscale",
  "status": "connected",
  "publicUrl": "http://dagu.tail01cbab.ts.net",
  "mode": "direct",
  "isPublic": false,
  "startedAt": "2024-01-27T12:45:44Z"
}

Status values: disabled, connecting, connected, reconnecting, error

Mode values: direct (tailnet), funnel (public)

Technical Details

• Connection timeout: 60 seconds
• Status poll interval: 100ms
• Graceful degradation: Tunnel failure does not stop the server
• Proxy target: Connects to 127.0.0.1:<port> (auto-converts 0.0.0.0)

See Also

• Server Configuration - Host, port, authentication
• Authentication - Securing access
• Remote Nodes - Multi-instance setup