Install Hydra

Prerequisites

• Both Hydra-CLI and the generated project files have dependencies that require Node v10.16 or higher

• npm and (optional, but recommended) npx

• Hydra stores the substrate data in an external PostgresSQL 12 instance. The scaffolding tool provides a convenient shortcut for running the database instance from a Docker image. In this case the standard docker environment (docker and docker-compose) should be available.

• (Optional) Docker engine. The scaffolding tool provides targets for building Docker images for external deployment.

Installation

The npm repository and thehydra-cliversion will likely change in the near future. In such a case simply replace @dzlzv/hydra-cliwith<npm_repo>/hydra-cli@<version> in the instructions below ``

Global installation:

npm install -g @dzlzv/hydra-cli

The path to hydra-cli binaries will be added to the system-wide $PATH.

Local installation:

npm install @dzlzv/hydra-cli

The binaries will be installed to the local .bin folder. You can execute hydra-cli commands by adding the.binfolder within your local node_modules to $PATH.

Isolated set-up:

Execute hydra-cli commands directly by typing

npx @dzlzv/hydra-cli <command>

This provides an isolated way to execute hydra-cli commands.

Run hydra-cli --version to check your installation

It may be convenient to create an alias for quick access to hydra-cli e.g.

alias hydra-cli='npx @dzlzv/hydra-cli'