Files
start-os/container-runtime/CLAUDE.md
Aiden McClelland 3a63f3b840 feat: add mdns hostname metadata variant and fix vhost routing
- Add HostnameMetadata::Mdns variant to distinguish mDNS from private domains
- Mark mDNS addresses as private (public: false) since mDNS is local-only
- Fall back to null SNI entry when hostname not found in vhost mapping
- Simplify public detection in ProxyTarget filter
- Pass hostname to update_addresses for mDNS domain name generation
2026-02-14 15:34:48 -07:00

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# Container Runtime — Node.js Service Manager
Node.js runtime that manages service containers via JSON-RPC. See `RPCSpec.md` in this directory for the full RPC protocol.
## Architecture
```
LXC Container (uniform base for all services)
└── systemd
└── container-runtime.service
└── Loads /usr/lib/startos/package/index.js (from s9pk javascript.squashfs)
└── Package JS launches subcontainers (from images in s9pk)
```
The container runtime communicates with the host via JSON-RPC over Unix socket. Package JavaScript must export functions conforming to the `ABI` type defined in `sdk/base/lib/types.ts`.
## `/media/startos/` Directory (mounted by host into container)
| Path | Description |
| -------------------- | ----------------------------------------------------- |
| `volumes/<name>/` | Package data volumes (id-mapped, persistent) |
| `assets/` | Read-only assets from s9pk `assets.squashfs` |
| `images/<name>/` | Container images (squashfs, used for subcontainers) |
| `images/<name>.env` | Environment variables for image |
| `images/<name>.json` | Image metadata |
| `backup/` | Backup mount point (mounted during backup operations) |
| `rpc/service.sock` | RPC socket (container runtime listens here) |
| `rpc/host.sock` | Host RPC socket (for effects callbacks to host) |
## S9PK Structure
See `../core/s9pk-structure.md` for the S9PK package format.