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Your terminal watchtower

Sentinel is a host operations platform delivered as a single binary. It gives you a realtime browser interface to manage tmux sessions, monitor services, track alerts, run operational procedures, and recover from failures — all on your own machine.

No Electron. No cloud relay. Just your host and your shell.

Documentation • Releases • Quick Start

Why Sentinel

• One binary, fast setup, low operational overhead.
• Realtime tmux control with session, window, and pane visibility.
• Service monitoring and control for systemd and launchd.
• Alerts, timeline, and metrics for host-level observability.
• Runbooks for executable operational procedures with job tracking.
• Recovery snapshots and restore workflows.
• Guardrails for safer destructive terminal actions.
• Optimistic and responsive UI tuned for desktop and mobile.

Core Capabilities

• Tmux — Interactive PTY in the browser with tmux workspace management.
• Services — Monitor and control systemd/launchd units from /services.
• Alerts — Deduplicated alert feed from watchtower and service health at /alerts.
• Timeline — Searchable operational audit log at /timeline.
• Metrics — System and runtime resource dashboard at /metrics.
• Runbooks — Step-by-step operational procedures with job history at /runbooks.
• Recovery — Session snapshots and restore workflows.
• Guardrails — Safety rules for destructive terminal actions.
• Event-driven updates over WebSocket (/ws/events).
• Service mode and daily autoupdate (Linux/macOS).
• Optional token auth and origin allowlist.

Requirements

• Linux or macOS host.
• tmux installed for tmux workspace features.

Quick Start

Install

curl -fsSL https://raw.githubusercontent.com/opus-domini/sentinel/main/install.sh | bash

Open Sentinel

• http://127.0.0.1:4040

Validate Runtime

sentinel doctor
sentinel service status

Security Baseline for Remote Access

If you expose Sentinel outside localhost (0.0.0.0), always configure:

• token
• allowed_origins

Documentation

• Getting Started
• Architecture
• Security
• CLI Reference
• HTTP API
• WebSocket and Events
• Troubleshooting

Screenshots

Terminal Workspace

Manage tmux sessions, windows, and panes with realtime sync — no terminal tab juggling.

Attach to any pane with a full interactive PTY, right in the browser.

Full terminal control on mobile — touch-optimized with gesture-safe zones.

Ops Control Plane

Services: Monitor and control systemd/launchd services with live status, logs, and one-click actions.

Alerts: Catch failures early with deduplicated alerts from watchtower and service health checks.

Metrics: CPU, memory, disk, and runtime stats at a glance — no external agents needed.

Timeline: Searchable audit log of every operation, alert, and service event on your host.

Runbooks: Executable step-by-step procedures with job tracking and per-step output history.

Settings

Theme, token auth, storage management, and guardrails — all configurable from the UI.

Stargazers over time ⭐