deploy rails application

I want to deploy my rails application, so I spent a few time to search related articles.
In my opinion, the easiest way to deploy your application is to use virtual host. the second choice is to use the Alias mechanism of web server.

HowToUseRailsWithAliasedURLs
HowToInstallApplicationsInSubdirectories
HowToSetTheBaseURLsOfYourRailsApps
HowToUseRailsWithRewrittenURLs
HowtoDeployMoreThanOneRailsAppOnOneMachine
HowtoUseSymLinksToGraftRailsOntoYourWebsite