Install log rotate script for Capistrano

logrotate.capify

    desc "Install log rotate script"
    task :rotate_logs, :roles => :app do
      set :use_sudo, true
      default_run_options[:pty] = true
      rotate_script = %Q{#{shared_path}/log/*.log {
        daily
        missingok
        rotate 30
        compress
        size 5M
        delaycompress
        sharedscripts
        postrotate
          touch #{current_path}/tmp/restart.txt
        endscript
      }}
      put rotate_script, "#{shared_path}/logrotate_script"
      sudo "cp #{shared_path}/logrotate_script /etc/logrotate.d/#{application}_#{rails_env}"
      run "rm #{shared_path}/logrotate_script"
      # run manually with: logrotate -f /etc/logrotate.d/homesav_staging
    end

I am assuming you're restarting Passenger because the logfiles are not being freed up. You can use the copytruncate parameter in the rotate script and you shouldn't have to worry about bouncing it.