unleash.unleash/docs/getting-started.md

id	title
getting_started	Getting Started

Requirements

You will need Node.js >= 8.0.0 and a PostgreSQL 9.5+ database instance to be able to run Unleash.

When starting Unleash you must specify a database URI (can be set as environment variable DATABASE_URL) which includes a username and password, that have rights to migrate the database.

On startup Unleash will perform necessary migrations if needed.

Start Unleash

1. The simplest way to get started:

$ npm install unleash-server -g
$ unleash -d postgres://unleash_user:passord@localhost:5432/unleash -p 4242

Unleash started on http://localhost:4242

2. Or programmatically:

You can also depend on unleash

const unleash = require('unleash-server');

unleash
  .start({
    databaseUrl: 'postgres://unleash_user:passord@localhost:5432/unleash',
    port: 4242,
  })
  .then(unleash => {
    console.log(
      `Unleash started on http://localhost:${unleash.app.get('port')}`,
    );
  });

Available unleash options include:

• databaseUrl - the postgres database url to connect to. Should include username/password.
• databaseSchema - the postgres database schema to use. Defaults to 'public'.
• port - which port the unleash-server should bind to. If port is omitted or is 0, the operating system will assign an arbitrary unused port. Will be ignored if pipe is specified.
• host - which host the unleash-server should bind to. If host is omitted, the server will accept connections on the unspecified IPv6 address (::) when IPv6 is available, or the unspecified IPv4 address (0.0.0.0) otherwise.
• pipe - parameter to identify IPC endpoints. See https://nodejs.org/api/net.html#net_identifying_paths_for_ipc_connections for more details
• enableLegacyRoutes (boolean) - allows you to turn on/off support for legacy routes to support older clients. Enabled by default.
• serverMetrics (boolean) - use this option to turn on/off prometheus metrics.
• preHook (function) - this is a hook if you need to provide any middlewares to express before unleash adds any. Express app instance is injected as first argument.
• preRouterHook (function) - use this to register custom express middlewares before the unleash specific routers are added. This is typically how you would register custom middlewares to handle authentication.
• secret (string) - set this when you want to secure unleash. Used to encrypt the user session.
• adminAuthentication (string) - use this when implementing custom admin authentication securing-unleash. Possible values are:
  • none - will disable authentication altogether
  • unsecure - (default) will use simple cookie based authentication. UI will require the user to specify an email in order to use unleash.
  • custom - use this when you implement your own custom authentication logic.
• ui (object) - Set of UI specific overrides. You may set the following keys: headerBackground, environment, slogan.
• getLogger (function) - Used to register a [custom log provider](#How do I configure the log output).

3. Docker

You can also use the hosted docker image to start the Unleash server

docker run -d -e DATABASE_URL=postgres://user:pass@10.200.221.11:5432/unleash unleashorg/unleash-server

How do I configure the log output?

By default, unleash uses log4js to log important information. It is possible to swap out the logger provider (only when using Unleash programmatically). You do this by providing an implementation of the getLogger function as This enables filtering of log levels and easy redirection of output streams.

function getLogger(name) {
  // do something with the name
  return {
    debug: console.log,
    info: console.log,
    warn: console.log,
    error: console.error,
  };
}

The logger interface with its debug, info, warn and error methods expects format string support as seen in debug or the JavaScript console object. Many commonly used logging implementations cover this API, e.g., bunyan, pino or winston.