lighthouse/book/src/interop-environment.md

Interop Environment

All that is required for inter-op is a built and tested development environment.

Repositories

You will only require the sigp/lighthouse library.

To allow for faster build/test iterations we will use the interop branch of sigp/lighthouse for September 2019 interop. Please use ensure you git checkout interop after cloning the repo.

File System

When lighthouse boots, it will create the following directories:

• ~/.lighthouse: database and configuration for the beacon node.
• ~/.lighthouse-validator: database and configuration for the validator client.

After building the binaries with cargo build --release --all, there will be a target/release directory in the root of the Lighthouse repository. This is where the beacon_node and validator_client binaries are located.

You do not need to create any of these directories manually.