Created
January 26, 2010 01:57
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#!/usr/bin/env ruby | |
################################################################################ | |
# | |
# Copyright (C) 2006 Peter J Jones (pjones@pmade.com) | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining | |
# a copy of this software and associated documentation files (the | |
# "Software"), to deal in the Software without restriction, including | |
# without limitation the rights to use, copy, modify, merge, publish, | |
# distribute, sublicense, and/or sell copies of the Software, and to | |
# permit persons to whom the Software is furnished to do so, subject to | |
# the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be | |
# included in all copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | |
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | |
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | |
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
# | |
################################################################################ | |
# This script will update your monit configuration file to monitor your | |
# mongrel cluster by reading the mongrel cluster file and generating monit | |
# check entries. It places delimiters in the configuration file so that you | |
# can run this script multiple times without generating duplicate entries. | |
# | |
# Run it like this: | |
# | |
# mongrel_monit --mongrel=/path/to/mongrel/config.yml --monit=/path/to/monitrc | |
# | |
# You can edit the ERB template below to control the generated monit config. | |
# | |
TEMPLATE = <<EOT | |
check process mongrel_<%= @port %> with pidfile <%= @pidfile %> | |
group mongrel | |
start program = "/usr/local/bin/<%= @start %>" | |
stop program = "/usr/local/bin/<%= @stop %>" | |
if failed host 127.0.0.1 port <%= @port %> protocol http | |
with timeout 10 seconds | |
then restart | |
if totalmem > 100 Mb then restart | |
if cpu is greater than 60% for 2 cycles then alert | |
#if cpu > 90% for 5 cycles then restart | |
#if loadavg(5min) greater than 10 for 8 cycles then restart | |
if 3 restarts within 5 cycles then timeout | |
EOT | |
################################################################################ | |
require 'erb' | |
require 'optparse' | |
require 'fileutils' | |
require 'rubygems' | |
require 'mongrel_cluster/init' | |
################################################################################ | |
module Kernel | |
$commands = [] | |
# Hack Kernel::` so that we can capture what mongrel_cluster does | |
def ` (cmd) | |
$commands << cmd | |
system(':') # to set $? | |
end | |
# Hack Kernel::puts to shut mongrel_cluster up | |
def puts (str) | |
true | |
end | |
end | |
################################################################################ | |
options = OptionParser.new | |
options.on('--mongrel=FILE', 'Mongrel configuration file') do |o| | |
$mongrel_config = o | |
end | |
options.on('--monit=FILE', 'Monit configuration file') do |o| | |
$monit_config = o | |
end | |
options.parse! | |
unless $mongrel_config and $monit_config | |
puts "please give --mongrel and --monit" | |
exit 1 | |
end | |
################################################################################ | |
mongrel_config_data = YAML.load_file($mongrel_config) | |
Dir.chdir(mongrel_config_data['cwd']) if mongrel_config_data['cwd'] | |
################################################################################ | |
# This is the only way to access the cmd that mongrel_cluster uses so that we | |
# can keep things DRY | |
start = Cluster::Start.new | |
start.instance_variable_set(:@config_file, $mongrel_config) | |
start.run | |
start_commands = $commands.dup | |
$commands.clear | |
stop = Cluster::Stop.new | |
stop.instance_variable_set(:@config_file, $mongrel_config) | |
stop.run | |
stop_commands = $commands.dup | |
$commands.clear | |
################################################################################ | |
template = ERB.new(TEMPLATE) | |
config = '' | |
0.upto(start_commands.length - 1) do |i| | |
@port = start_commands[i].match(/-p\s*(\d+)/)[1] | |
@pidfile = File.expand_path(start_commands[i].match(/-P\s*(\S+)/)[1]) | |
@start = start_commands[i] | |
@stop = stop_commands[i] | |
config << template.result(binding) | |
end | |
################################################################################ | |
monit_config_data = File.open($monit_config) {|f| f.read} | |
# TODO: if you have more than one cluster, this won't do | |
banner_start = "#= Mongrel_Monit Config Start =#\n" | |
banner_stop = "#= Mongrel_Monit Config End =#\n" | |
if monit_config_data.match(/#{banner_start}.*#{banner_stop}/m) | |
monit_config_data.sub!(/#{banner_start}.*#{banner_stop}/m, "#{banner_start}#{config}#{banner_stop}") | |
else | |
monit_config_data << "#{banner_start}#{config}#{banner_stop}" | |
end | |
File.open($monit_config, 'w') {|f| f << monit_config_data} | |
################################################################################ |
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