> ## Documentation Index
> Fetch the complete documentation index at: https://docs.microsandbox.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# VSock

> Ruby SDK - VSock API reference

Expose a host Unix socket or local Windows named pipe to a sandbox over virtio-vsock. See [VSock](/networking/host-sockets) for guest connection details, platform support, and security considerations.

<Note>VSock routes are local-only and unavailable with the multi-tenant deployment profile.</Note>

## Typical flow

```ruby theme={null}
require "microsandbox"

sandbox = Microsandbox::Sandbox.builder("worker")
  .image("alpine")
  .vsock("/run/host-api.sock", 5000)
  .create
```

## SandboxBuilder

### vsock()

```ruby theme={null}
builder.vsock(host_path, port) # => SandboxBuilder
```

Expose a host Unix stream socket or local Windows named pipe on host CID `2` at `port`.

### vsock\_dgram()

```ruby theme={null}
builder.vsock_dgram(host_path, port) # => SandboxBuilder
```

Expose a host Unix datagram socket while preserving datagram boundaries. Datagram routes are unavailable on Windows.

Both methods can be called repeatedly to add routes. Host paths must be absolute, and each socket type and port pair must be unique.