A tool for rolling changes out to servers.

To roll stuff out, select a group of hosts to affect:

• a master list of hosts is collected by the "host source" which is pluggable.
• aliased hostname glob expressions specify which hosts to pay attention to (-h)
• the list may be truncated by starting after (--startat) or stopping before (--stopbefore) specified hosts

And what commands you'd like to run:

• components to deploy get built on configurable build servers then deployed to individual hosts (-d)
• restart services (-r)
• arbitrary other commands may be specified as long as the remote end knows how to execute them (-c)

The rollout will then begin:

• rollouts are executed by the "transport" which is pluggable and defaults to ssh.
• hosts are "enqueued" one at a time with an optional delay between them (--sleeptime)
• multiple hosts can be worked on in parallel (--parallel)
• after a number of hosts have completed their work, the rollout can pause to allow sanity checking before continuing on (--pauseafter)

If configured, graphite will be sent a metric of the form events.deploy.{component} for each component deployed.

The rolling pin also features integration with Harold.

See example.ini for configuration instructions.