lighthouse-pulse/book/src/interop-cli.md
2019-09-03 11:23:21 +10:00

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# Interop CLI Overview
The Lighthouse CLI has two primary tasks:
- **Resuming** an existing database with `$ ./beacon_node`.
- **Creating** a new testnet database using `$ ./beacon_node testnet`.
_See [Scenarios](./interop-scenarios.md) for methods we're likely to use
during interop._
## Creating a new database
There are several methods for creating a new beacon node database:
- `quick`: using the `(validator_client, genesis_time)` tuple.
- `recent`: as above but `genesis_time` is set to the start of some recent time
window.
- `file`: loads the genesis file from disk in one of multiple formats.
- `bootstrap`: a Lighthouse-specific method where we connect to a running node
and download it's specification and genesis state via the HTTP API.
See `$ ./beacon_node testnet --help` for more detail.
## Resuming from an existing database
Once a database has been created, it can be resumed by running `$ ./beacon_node`.
Presently, this command will fail if no existing database is found. You must
use the `$ ./beacon_node testnet` command to create a new database.