Run a single site across multiple servers

Grow beyond a single box by running one site across multiple servers, each with its own role as a web, database, cache or worker machine. Rocketeers keeps every server in the set in step: deployments roll out to all of them in parallel and only ever go live together. Each server first prepares and checks the health of the new release, and only once they all pass does the site switch over. If a single server fails, the whole cluster rolls back, so your site is never live on an unfinished or unhealthy release. Ports between servers open automatically, and you decide where after deployment tasks and commands run: every server, the web server only (handy for steps like migrations that should run only once), or a specific set.