Frontrunner

Frontrunner is a daemon which triggers a reconfiguration of HAProxy, when an application is modified on Marathon.

It uses node-zookeeper-client to connect to the ZooKeeper cluster used by Marathon and detect changes.

Requirements

* node.js 0.10+

Installation

git clone https://github.com/Wizcorp/frontrunner.git

To install dependencies, run the following command in the created directory:

npm install --production

If you don't plan to use yaml config files, you can use the following:

npm install --production  --no-optional

Configuration

Frontrunner use node-config to manage its configuration files. You can write your configuration files in JavaScript, JSON or YAML.

A default configuration file is provided. It shouldn't be edited.

It contains the following options:

• zookeeper.connectionString: Comma separated host:port pairs, each represents a ZooKeeper server.
• marathon: Marathon configuration.
  • url: Marathon API url used to get the tasks.
  • retryDelay: Delay between two attemps to get the tasks from the Marathon API, if the first request fails.
• activeProxy: The name of the proxy to use.
• proxy: Configuration objects for the supported proxies. Each object is as follows:
  • templatePath: Path to the proxy config generator.
  • configFile: Path to the proxy config file.
  • reloadCommand: Command to run to reload the proxy.
  • reloadDelay: The minimal time interval between two reload.

To override some values, you have to create a new file with your environment name.

# config/production.yml

zookeeper:
  connectionString: "192.168.1.1:2181,192.168.1.2:2181,192.168.1.3:2181"
marathon:
  url: "http://192.168.1.1:8080"
proxy:
  haproxy:
    templatePath: "haproxy_custom.cfg"
    reloadCommand: "service haproxy reload"

Usage

To run Frontrunner in the production environment and use the config file, you've just created, run the following:

NODE_ENV=production npm start