A NAS appliance built on bcachefs.
NASty is a NAS operating system built on NixOS and bcachefs. It turns commodity hardware into a storage appliance serving NFS, SMB, iSCSI, and NVMe-oF — managed from a single web UI, updated atomically, and rolled back when things go sideways.
- bcachefs — compression, checksumming, erasure coding, tiering, encryption, O(1) snapshots
- File sharing — NFS and SMB with per-share ACLs
- Block storage — iSCSI and NVMe-oF with dedicated targets per volume
- Subvolumes — filesystem and block subvolumes with quotas, compression, and tiering per subvolume
- Snapshots — instant, space-efficient point-in-time copies
- File browser — browse, upload, and manage files from the web UI
- Dashboard — CPU, memory, storage, temperature, frequency — with scrollable history charts (30-day retention)
- Alerts — configurable rules for filesystem usage, disk health, temperatures, scrub errors, and more
- Notifications — alert delivery via SMTP email, Telegram, webhooks, and ntfy push notifications
- S.M.A.R.T. — disk health monitoring with per-disk details
- nasty-top — standalone TUI for live per-device IO, latency, and tuning
- Apps — Docker containers and Compose stacks with auto-enable, image pull progress, and container inspect
- Virtual machines — QEMU/KVM with VNC console, disk snapshots, and VM cloning (experimental)
- Web UI — manage filesystems, subvolumes, snapshots, shares, disks, services, and more
- Web terminal — built-in shell with command cheatsheets and diagnostic tools
- Glossary — built-in help page with storage terms, protocol guidance, and FAQ
- Let's Encrypt — automatic TLS certificates via ACME (TLS-ALPN and DNS challenges)
- Tailscale — built-in VPN with one-click setup
- Access control — local user accounts with role-based permissions and API tokens
- UPS monitoring — NUT integration for graceful shutdown on power loss (opt-in)
- Atomic updates — NixOS-based, with one-click rollback to any previous generation
- Binary cache — fast updates via cachix (bcachefs-tools, engine, webui pre-built)
- Kubernetes integration — CSI driver for dynamic volume provisioning across all 4 protocols
Dashboard
Filesystems
Subvolumes
Sharing
Updates
Terminal
- Download the latest ISO from Releases
- Boot it on your hardware — the installer lets you pick a disk and press Enter
- Open the WebUI at
https://<nasty-ip> - Default credentials: admin / admin
ISO won't boot? Some UEFI firmware doesn't like NixOS ISOs. See INSTALL.md for an alternative installation method from any Linux live environment.
NASty has three update flavors:
| Flavor | What you get | Description |
|---|---|---|
| Mild | Tagged stable releases (v0.0.1) |
Stable releases |
| Spicy | Pre-release builds (s0.0.1) |
Pre-release builds with newer features |
| Nasty | Latest commit on main | Bleeding edge, no guarantees |
Switch flavors from Settings → Update → Flavor in the WebUI.
| Component | Technology | Why |
|---|---|---|
| Engine | Rust | Async runtime, handles all storage and system operations |
| Web UI | SvelteKit + TypeScript | Reactive UI with real-time WebSocket updates |
| OS | NixOS | Atomic updates, rollback, reproducible system config |
| Filesystem | bcachefs | Checksumming, compression, tiering, snapshots, erasure coding |
| API | JSON-RPC 2.0 over WebSocket | Persistent connection, bidirectional, low overhead |
engine/ Rust workspace — storage, sharing, system management
webui/ SvelteKit web interface
nixos/ NixOS modules and ISO configuration
The full ecosystem (CSI driver, Helm chart, kubectl plugin, and more) lives at github.com/nasty-project.
See FAQ.md for common questions about bcachefs, NixOS, and project status.
NASty collects anonymous usage data (drive count and storage capacity). Disable anytime from Settings → Telemetry. Details: nasty-telemetry.
GPLv3
