Description

Installs the Disco map-reduce framework using the default settings.

Requirements

It is possible that earlier versions of these cookbooks will work as well.
These are the versions with which I've tested the cookbook.

• python >= 1.0.6

Platforms

The cookbook is tested and works on Debian 6.0 and later. It may also work
on other platforms, but the templates are set up for Debian SysV init-type
systems. Contributions to support other platforms are gladly welcomed.

Attributes

• disco
  • repository - URL to Git repository with Disco source code to clone and install. Default: "https://github.com/discoproject/disco.git"
  • revision - Revision to check out from within the repository. Default: "0.4.2" (tag)
  • checkout - Directory to clone repository into. Default: "/usr/src/disco"
  • user, group: User and group to run Disco as. Cookbook assumes that the user and group already exist. Note: a default SSH configuration will be generated for the user, as Disco requires passwordless SSH key access between the master and slaves. Default: "disco" (for both)
  • slave_search: A Chef search query which will identify nodes that are configured to be Disco slaves. Default: "recipes:disco".
• erlang
  • magic_cookie: Value to use as an Erlang magic cookie. This value must be the same on all Disco nodes (master and slaves). Default: "set_me_to_something_random"

Usage

The cookbook has two recipes: default and master.

default Recipe

The default recipe clones and installs the Disco source. This recipe
should be used on Disco slave nodes.

Note: This recipe installs

master Recipe

The master recipe includes default, and configures and starts a Service
for running the Disco master node. This recipe additionally configures the
Disco master via "/usr/local/var/disco/disco_8989.config", a JSON
configuration file for the Disco cluster, based on a node search. It may
take several Chef runs for the search to stabilize, and the Disco master
will be restarted each time this templated file changes.