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Gosen (ごせん)

Gosen is a Ruby library for the Grid'5000 RESTful API. It relies on the Restfully library for interacting with the API.


Currently, this library allows to submit deployments that retry automatically when too many nodes fail. A clone of the Katapult script, called Trebuchet, is also included and can be used on the command line.


$ gem install gosen

Library Usage

The following example deploys the latest version of the Lenny-x64-big environment on the paramount-1 and paramount-2 nodes. If both nodes are not successfully deployed, Gosen retries again (in this case, at most 5 deployment are submitted).

#!/usr/bin/env ruby

require 'gosen'
require 'logger'
require 'restfully'

logger = => '') do |grid, session|
  site = grid.sites[:rennes]
  nodes = [ '', '' ]
  deployment =, 'lenny-x64-big', nodes,
    :logger => logger,
    :max_deploy_runs => 5,
    :min_deployed_nodes => nodes.length,
    :ssh_public_key =>'~/.ssh/authorized_keys'))

The logger allows to print information about the deployment, in a style similar to Katapult:

I, [2010-04-21T11:31:09.351803 #21673]  INFO -- : Kadeploy run 1 with 2 nodes (0 already deployed, need 2 more)
I, [2010-04-21T11:37:11.817323 #21673]  INFO -- : Nodes deployed:
I, [2010-04-21T11:37:11.817440 #21673]  INFO -- : Had to run 1 kadeploy runs, deployed 2 nodes

The Gosen specific options accepted by are:

  • :logger, a Ruby Logger object,
  • :min_deployed_nodes, the minimal number of successfully deployed nodes (defaults to 1),
  • :max_deploy_runs, the maximal number of deploy runs to perform (defaults to 1),
  • :continue_if_error, a boolean allowing to retry if a deployment returned with an error (defaults to false),
  • :ssh_public_key, an SSH public key to be installed in the deployed environment.

It is also possible to pass options accepted by the Deployments API, such as version, block_device, partition_number, etc.

Script usage

Trebuchet was designed to be used like Katapult:

$ trebuchet -e lenny-x64-base --env-version 3 --min-deployed-nodes 4 --max-deploy-runs 2 -c

Run trebuchet --help to get usage information.

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


Copyright (c) 2010 Pierre Riteau. See LICENSE for details.