Run an interactive console session on a production machine with Capistrano.

Capfile

require 'bundler/capistrano'
set :bundle_flags, "--deployment --binstubs"
set :default_environment, 'PATH' => '$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH'

role :web, "your.ip.here"
set :user, "passenger"

namespace :rails do
  desc "Remote console"
  task :console, roles: :app do
    run_interactively "bin/rails console #{rails_env}"
  end

  desc "Remote dbconsole"
  task :dbconsole, roles: :app do
    run_interactively "bin/rails dbconsole #{rails_env}"
  end
end

def run_interactively(command, server=nil)
  server ||= find_servers_for_task(current_task).first
  system 'ssh', '-l', user, server.host, '-t', "cd '#{current_path}' && env #{environment} #{command}"
end

def environment
  default_environment.map { |k, v| "#{k}=#{v}" }.join(' ')
end