[a different version of this message was previously posted on rails talk]
I'm trying to get a daemon to work on debian using daemons gem. I installed daemons via gems and I'm running version 1.0.3.
I used daemon_generator from
http://kylemaxwell.typepad.com/everystudent/2006/08/after_writing_r.html
I created a daemon called test and ran it on OSX with no problem,
meaning that
./script/daemons start
and
./script/daemons stop
both work fine.
I moved it to a debian system, modifed test.rb to use the production
environment, and I can't get it to work. I've tried a bunch of things.
On the debian system
./script/daemons start
sometimes works. I see the daemon running, I see the monitor daemon
running, and
messages are going into the production log file.
If I try to stop it with
./script/daemons stop
the test daemon stops but the monitor does *not* stop. Then I get a log file for the test daemon (see content below).
It appears that the monitor is not responding to the TERM signal -- it seems to gobble it up and
keep running. On the theory that something else in
rails may ALSO be setting a term trap we added this code in an attempt to expose the trap:
def watch(applications)
foo = trap('TERM', { })
bar = trap('TERM', foo)
foo turned out to be 'default' and was no help. However, IT STARTED WORKING. I don't know why.
I hope this is of use to someone in finding and fixing this problem.
-Kelly
# Logfile created on Thu Dec 07 15:33:33 -0800 2006 by
logger.rb/1.5.2.9
failed to allocate memory
stack level too deep
exception reentered
uninitialized constant Rails
no such file to load -- rails.rb
No such file or directory - [snip]/log/test.rb.pid
no such file to load -- openssl
no such file to load -- http-access2
no such file to load -- xmlscan/scanner
no such file to load -- xml/parser
no such file to load -- tmail/scanner_c.so
no such file to load -- tmail/base64.so
test.rb.log (END)
Here is lib/daemons/test.rb:
#!/usr/bin/env ruby
#You might want to change this
ENV["RAILS_ENV"] ||= "production"
require File.dirname(__FILE__) + "/../../config/environment"
$running = true;
Signal.trap("TERM") do
$running = false
end
while($running) do
# Replace this with your code
ActiveRecord::Base.logger << "This daemon is still running at
#{Time.now}.\n"
sleep 10
end
and here is the ctl file:
#!/usr/bin/env ruby
require 'rubygems'
require "daemons"
require 'yaml'
require 'erb'
require 'active_support'
options = YAML.load(
ERB.new(
IO.read(
File.dirname(__FILE__) + "/../../config/daemons.yml"
)).result).with_indifferent_access
options[:dir_mode] = options[:dir_mode].to_sym
Daemons.run File.dirname(__FILE__) + '/test.rb', options
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