deploy.rb

  task :logrotate do
    require 'erb'
    upload_path = "#{shared_path}/system/logrotate" 
    template = File.read("deploy/logrotate.erb")
    file = ERB.new(template).result(binding) 
    put file, upload_path, :mode => 0644
    run "if [ -e /etc/logrotate.d ]; then sudo cp #{shared_path}/system/logrotate /etc/logrotate.d/#{name}; fi"
  end

after 'deploy:symlink', 'deploy:logrotate'

gistfile1.rb

    # Stolen from Unicorn::Util
    #
    # This reopens ALL logfiles in the process that have been rotated
    # using logrotate(8) (without copytruncate) or similar tools.
    # A +File+ object is considered for reopening if it is:
    #   1) opened with the O_APPEND and O_WRONLY flags
    #   2) opened with an absolute path (starts with "/")
    #   3) the current open file handle does not match its original open path
    #   4) unbuffered (as far as userspace buffering goes, not O_SYNC)
    # Returns the number of files reopened
    def reopen_logs
      nr = 0
      append_flags = File::WRONLY | File::APPEND
      Rails.logger.info "Rotating logs"

      #logs = [STDOUT, STDERR]
      #logs.each do |fp|
      ObjectSpace.each_object(File) do |fp|
        next if fp.closed?
        next unless (fp.sync && fp.path[0..0] == "/")
        next unless (fp.fcntl(Fcntl::F_GETFL) & append_flags) == append_flags

        begin
          a, b = fp.stat, File.stat(fp.path)
          next if a.ino == b.ino && a.dev == b.dev
        rescue Errno::ENOENT
        end

        open_arg = 'a'
        if fp.respond_to?(:external_encoding) && enc = fp.external_encoding
          open_arg << ":#{enc.to_s}"
          enc = fp.internal_encoding and open_arg << ":#{enc.to_s}"
        end
        Rails.logger.info "Rotating path: #{fp.path}"
        fp.reopen(fp.path, open_arg)
        fp.sync = true
        nr += 1
      end # each_object
      nr
    end


    Signal.trap("HUP") { reopen_logs }

logrotate.erb

<%= shared_path %>/log/*.log {
  daily
  missingok
  compress
  rotate 7
  sharedscripts

  postrotate
    for i in <%= shared_path %>/pids/*.pid; do
      kill -HUP `cat $i`
    done
  endscript
}