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Copyright (c) 2006 Bradley Taylor, bradley@fluxura.com
GNU LESSER GENERAL PUBLIC LICENSE
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59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Copyright (c) 2006 Bradley Taylor, bradley@fluxura.com
GNU LESSER GENERAL PUBLIC LICENSE
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Copyright (C) 1991, 1999 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
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That's all there is to it!

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== Mongrel Cluster Plugin
Tool to help start/stop/restart multiple mongrel servers to use behind a load balancer like Apache 2.2 (mod_proxy_balancer), Lighttpd, Pound, Pen or Balance. This plugin adds an option to specify a number of Mongrel servers to launch, a range of ports, and a configuration file for the cluster. Use "-h" to see command syntax.
Configure cluster and write configuration file:
mongrel_rails cluster::configure
Start cluster:
mongrel_rails cluster::start
Restart cluster:
mongrel_rails cluster::restart
Stop cluster:
mongrel_rails cluster::stop
Capistrano Recipe
Add to config/deploy.rb:
require 'mongrel_cluster/recipes'
Example usage:
cap -a configure_mongrel_cluster
Variables
mongrel_servers: Number of Mongrel servers to start.
mongrel_port: Starting port to bind to.
mongrel_address: Address to bind to.
mongrel_environment: Rails environment to run as.
mongrel_conf: Path to conf file. Defaults to /etc/mongrel_cluster/app_name.conf
mongrel_user: User to run mongrels in cluster as. Unset by default
mongrel_group: Group to run mongrels in cluster as. Unset by default.
Tasks (performed on :app role)
configure_mongrel_cluster: Configure the cluster with variables.
start_mongrel_cluster: Start Mongrel processes on the app server.
stop_mongrel_cluster: Stop the Mongrel processes on the app server.
restart_mongrel_cluster: Restart the Mongrel processes on the app server by starting and stopping mongrel_cluster.
restart: Calls restart_mongrel_cluster to allow Mongrel to be used with the standard Capistrano deploy task.
spinner: Calls start_mongrel_cluster to allow Mongrel to be used with the standard Capistrano cold_deploy task.
Supporting starting clusters on boot.
1. Create mongrel_cluster conf directory (/etc/mongrel_cluster).
2. Assign ownership to your capistrano user.
3. Copy the init.d script from this gem's resouces directory /etc/init.d.
4. chmod +x /etc/init.d/mongrel_cluster
5. Add to init.d startup. On RHEL/CentOS use: /sbin/chkconfig --level 345 mongrel_cluster on

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require 'rake'
require 'rake/testtask'
require 'rake/clean'
require 'rake/gempackagetask'
require 'rake/rdoctask'
require 'tools/rakehelp'
require 'fileutils'
include FileUtils
setup_tests
setup_clean ["pkg", "lib/*.bundle", "*.gem", ".config"]
setup_rdoc ['README', 'LICENSE', 'COPYING', 'lib/**/*.rb', 'doc/**/*.rdoc']
desc "Does a full compile, test run"
task :default => [:test, :package]
version="0.2.1"
name="mongrel_cluster"
setup_gem(name, version) do |spec|
spec.summary = "Mongrel plugin that provides commands and Capistrano tasks for managing multiple Mongrel processes."
spec.description = spec.summary
spec.author="Bradley Taylor"
spec.add_dependency('gem_plugin', '>= 0.2.1')
spec.add_dependency('mongrel', '>= 0.3.13.4')
spec.files += Dir.glob("resources/**/*")
spec.has_rdoc = false
spec.files += Dir.glob("bin/*")
spec.files += Dir.glob("examples/*")
spec.default_executable = "mongrel_cluster_ctl"
spec.executables = ["mongrel_cluster_ctl"]
end
task :install => [:test, :package] do
sh %{sudo gem install pkg/#{name}-#{version}.gem}
end
task :uninstall => [:clean] do
sh %{sudo gem uninstall #{name}}
end
task :gem_source do
mkdir_p "pkg/gems"
FileList["**/*.gem"].each { |gem| mv gem, "pkg/gems" }
FileList["pkg/*.tgz"].each {|tgz| rm tgz }
rm_rf "pkg/#{name}-#{version}"
sh %{ generate_yaml_index.rb -d pkg }
sh %{ scp -r pkg/* #{ENV['SSH_USER']}@rubyforge.org:/var/www/gforge-projects/railsmachine/releases/ }
end

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#!/usr/bin/env ruby
# Copyright (c) 2006 Bradley Taylor, bradley@fluxura.com
require 'optparse'
def run(command, verbose)
Dir.chdir @options[:conf_path] do
confs = Dir.glob("*.yml")
confs += Dir.glob("*.conf")
confs.each do |conf|
cmd = "mongrel_rails cluster::#{command} -c #{conf}"
cmd += " -v" if verbose
puts cmd if verbose
output = `#{cmd}`
puts output if verbose
puts "mongrel_rails cluster::#{command} returned an error." unless $?.success?
end
end
end
@options = {}
@options[:conf_path] = "/etc/mongrel_cluster"
@options[:verbose] = false
OptionParser.new do |opts|
opts.banner = "Usage: #{$0} (start|stop|restart) [options]"
opts.on("-c", "--conf_path PATH", "Path to mongrel_cluster configuration files") { |value| @options[:conf_path] = value }
opts.on('-v', '--verbose', "Print all called commands and output.") { |value| @options[:verbose] = value }
if ARGV.empty?
puts opts
exit
else
@cmd = opts.parse!(ARGV)
if @cmd.nil?
puts opts
exit
end
end
end
if @options[:conf_path] == nil && !File.directory?(@options[:conf_path])
puts "Invalid path to mongrel_cluster configuration files: #{@options[:conf_path]}"
exit
end
case @cmd[0]
when "start":
puts "Starting all mongrel_clusters..."
run "start", @options[:verbose]
when "stop":
puts "Stopping all mongrel_clusters..."
run "stop", @options[:verbose]
when "restart":
puts "Restarting all mongrel_clusters..."
run "stop", @options[:verbose]
run "start", @options[:verbose]
else
puts "Unknown command."
end
exit

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require 'gem_plugin'
require 'mongrel'
require 'yaml'
module Cluster
module ExecBase
include Mongrel::Command::Base
def validate
valid_exists?(@config_file, "Configuration file does not exist. Run mongrel_rails cluster::configure.")
return @valid
end
def read_options
@options = {
"environment" => ENV['RAILS_ENV'] || "development",
"port" => 3000,
"pid_file" => "log/mongrel.pid",
"servers" => 2
}
conf = YAML.load_file(@config_file)
@options.merge! conf if conf
end
def start
read_options
port = @options["port"].to_i - 1
pid = @options["pid_file"].split(".")
puts "Starting #{@options["servers"]} Mongrel servers..."
1.upto(@options["servers"].to_i) do |i|
argv = [ "mongrel_rails" ]
argv << "start"
argv << "-d"
argv << "-e #{@options["environment"]}" if @options["environment"]
argv << "-p #{port+i}"
argv << "-a #{@options["address"]}" if @options["address"]
argv << "-l #{@options["log_file"]}" if @options["log_file"]
argv << "-P #{pid[0]}.#{port+i}.#{pid[1]}"
argv << "-c #{@options["cwd"]}" if @options["cwd"]
argv << "-t #{@options["timeout"]}" if @options["timeout"]
argv << "-m #{@options["mime_map"]}" if @options["mime_map"]
argv << "-r #{@options["docroot"]}" if @options["docroot"]
argv << "-n #{@options["num_procs"]}" if @options["num_procs"]
argv << "-B" if @options["debug"]
argv << "-S #{@options["config_script"]}" if @options["config_script"]
argv << "--user #{@options["user"]}" if @options["user"]
argv << "--group #{@options["group"]}" if @options["group"]
argv << "--prefix #{@options["prefix"]}" if @options["prefix"]
cmd = argv.join " "
puts cmd if @verbose
output = `#{cmd}`
unless $?.success?
puts cmd unless @verbose
puts output
end
end
end
def stop
read_options
port = @options["port"].to_i - 1
pid = @options["pid_file"].split(".")
puts "Stopping #{@options["servers"]} Mongrel servers..."
1.upto(@options["servers"].to_i) do |i|
argv = [ "mongrel_rails" ]
argv << "stop"
argv << "-P #{pid[0]}.#{port+i}.#{pid[1]}"
argv << "-c #{@options["cwd"]}" if @options["cwd"]
argv << "-f" if @force
cmd = argv.join " "
puts cmd if @verbose
output = `#{cmd}`
unless $?.success?
puts cmd unless @verbose
puts output
end
end
end
end
class Start < GemPlugin::Plugin "/commands"
include ExecBase
def configure
options [
['-C', '--config PATH', "Path to cluster configuration file", :@config_file, "config/mongrel_cluster.yml"],
['-v', '--verbose', "Print all called commands and output.", :@verbose, false]
]
end
def run
start
end
end
class Stop < GemPlugin::Plugin "/commands"
include ExecBase
def configure
options [
['-C', '--config PATH', "Path to cluster configuration file", :@config_file, "config/mongrel_cluster.yml"],
['-f', '--force', "Force the shutdown.", :@force, false],
['-v', '--verbose', "Print all called commands and output.", :@verbose, false]
]
end
def run
stop
end
end
class Restart < GemPlugin::Plugin "/commands"
include ExecBase
def configure
options [
['-C', '--config PATH', "Path to cluster configuration file", :@config_file, "config/mongrel_cluster.yml"],
['-f', '--force', "Force the shutdown.", :@force, false],
['-v', '--verbose', "Print all called commands and output.", :@verbose, false]
]
end
def run
stop
start
end
end
class Configure < GemPlugin::Plugin "/commands"
include Mongrel::Command::Base
def configure
options [
["-e", "--environment ENV", "Rails environment to run as", :@environment, nil],
['-p', '--port PORT', "Starting port to bind to", :@port, 3000],
['-a', '--address ADDR', "Address to bind to", :@address, nil],
['-l', '--log FILE', "Where to write log messages", :@log_file, nil],
['-P', '--pid FILE', "Where to write the PID", :@pid_file, "log/mongrel.pid"],
['-c', '--chdir PATH', "Change to dir before starting (will be expanded)", :@cwd, nil],
['-t', '--timeout SECONDS', "Timeout all requests after SECONDS time", :@timeout, nil],
['-m', '--mime PATH', "A YAML file that lists additional MIME types", :@mime_map, nil],
['-r', '--root PATH', "Set the document root (default 'public')", :@docroot, nil],
['-n', '--num-procs INT', "Number of processor threads to use", :@num_procs, nil],
['-B', '--debug', "Enable debugging mode", :@debug, nil],
['-S', '--script PATH', "Load the given file as an extra config script.", :@config_script, nil],
['-N', '--num-servers INT', "Number of Mongrel servers", :@servers, 2],
['-C', '--config PATH', "Path to cluster configuration file", :@config_file, "config/mongrel_cluster.yml"],
['', '--user USER', "User to run as", :@user, nil],
['', '--group GROUP', "Group to run as", :@group, nil],
['', '--prefix PREFIX', "Rails prefix to use", :@prefix, nil]
]
end
def validate
@servers = @servers.to_i
valid?(@servers > 0, "Must give a valid number of servers")
valid_dir? File.dirname(@config_file), "Path to config file not valid: #{@config_file}"
return @valid
end
def run
@options = {
"port" => @port,
"servers" => @servers,
"pid_file" => @pid_file
}
@options["log_file"] = @log_file if @log_file
@options["debug"] = @debug if @debug
@options["num_procs"] = @num_procs if @num_procs
@options["docroot"] = @docroot if @docroots
@options["address"] = @address if @address
@options["timeout"] = @timeout if @timeout
@options["environment"] = @environment if @environment
@options["mime_map"] = @mime_map if @mime_map
@options["config_script"] = @config_script if @config_script
@options["cwd"] = @cwd if @cwd
@options["user"] = @user if @user
@options["group"] = @group if @group
@options["prefix"] = @prefix if @prefix
puts "Writing configuration file to #{@config_file}."
File.open(@config_file,"w") {|f| f.write(@options.to_yaml)}
end
end
end

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Capistrano.configuration(:must_exist).load do
set :mongrel_servers, 2
set :mongrel_port, 8000
set :mongrel_address, "127.0.0.1"
set :mongrel_environment, "production"
set :mongrel_conf, nil
set :mongrel_user, nil
set :mongrel_group, nil
set :mongrel_prefix, nil
desc <<-DESC
Configure Mongrel processes on the app server. This uses the :use_sudo
variable to determine whether to use sudo or not. By default, :use_sudo is
set to true.
DESC
task :configure_mongrel_cluster, :roles => :app do
set_mongrel_conf
argv = []
argv << "mongrel_rails cluster::configure"
argv << "-N #{mongrel_servers.to_s}"
argv << "-p #{mongrel_port.to_s}"
argv << "-e #{mongrel_environment}"
argv << "-a #{mongrel_address}"
argv << "-c #{current_path}"
argv << "-C #{mongrel_conf}"
argv << "--user #{mongrel_user}" if mongrel_user
argv << "--group #{mongrel_group}" if mongrel_group
argv << "--prefix #{mongrel_prefix}" if mongrel_prefix
cmd = argv.join " "
send(run_method, cmd)
end
desc <<-DESC
Start Mongrel processes on the app server. This uses the :use_sudo variable to determine whether to use sudo or not. By default, :use_sudo is
set to true.
DESC
task :start_mongrel_cluster , :roles => :app do
set_mongrel_conf
send(run_method, "mongrel_rails cluster::start -C #{mongrel_conf}")
end
desc <<-DESC
Restart the Mongrel processes on the app server by starting and stopping the cluster. This uses the :use_sudo
variable to determine whether to use sudo or not. By default, :use_sudo is set to true.
DESC
task :restart_mongrel_cluster , :roles => :app do
set_mongrel_conf
send(run_method, "mongrel_rails cluster::restart -C #{mongrel_conf}")
end
desc <<-DESC
Stop the Mongrel processes on the app server. This uses the :use_sudo
variable to determine whether to use sudo or not. By default, :use_sudo is
set to true.
DESC
task :stop_mongrel_cluster , :roles => :app do
set_mongrel_conf
send(run_method, "mongrel_rails cluster::stop -C #{mongrel_conf}")
end
desc <<-DESC
Restart the Mongrel processes on the app server by calling restart_mongrel_cluster.
DESC
task :restart, :roles => :app do
restart_mongrel_cluster
end
desc <<-DESC
Start the Mongrel processes on the app server by calling start_mongrel_cluster.
DESC
task :spinner, :roles => :app do
start_mongrel_cluster
end
def set_mongrel_conf
set :mongrel_conf, "/etc/mongrel_cluster/#{application}.yml" unless mongrel_conf
end
end

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---
:debug: false

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#!/bin/bash
#
# Copyright (c) 2006 Bradley Taylor, bradley@railsmachine.com
#
# mongrel_cluster Startup script for Mongrel clusters.
#
# chkconfig: - 85 15
# description: mongrel_cluster manages multiple Mongrel processes for use \
# behind a load balancer.
#
CONF_DIR=/etc/mongrel_cluster
RETVAL=0
# Gracefully exit if the controller is missing.
which mongrel_cluster_ctl >/dev/null || exit 0
# Go no further if config directory is missing.
[ -d "$CONF_DIR" ] || exit 0
case "$1" in
start)
mongrel_cluster_ctl start -c $CONF_DIR
RETVAL=$?
;;
stop)
mongrel_cluster_ctl stop -c $CONF_DIR
RETVAL=$?
;;
restart)
mongrel_cluster_ctl restart -c $CONF_DIR
RETVAL=$?
;;
*)
echo "Usage: mongrel_cluster {start|stop|restart}"
exit 1
;;
esac
exit $RETVAL

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#!/bin/sh
#
# PROVIDE: mongrel_cluster
# REQUIRE: DAEMON
# KEYWORD: shutdown
#
# Author: Andrew Bennett, potatosaladx@gmail.com
#
# Add the following line to /etc/rc.conf to enable 'mongrel_cluster':
#
# mongrel_cluster_enable="YES"
# # optional
# mongrel_cluster_config="/usr/local/etc/mongrel_cluster"
. "/etc/rc.subr"
# Set some defaults
mongrel_cluster_enable=${mongrel_cluster_enable:-"NO"}
mongrel_cluster_config=${mongrel_cluster_config:-"/usr/local/etc/mongrel_cluster"}
name="mongrel_cluster"
rcvar=`set_rcvar`
load_rc_config $name
: ${mongrel_cluster_enable="NO"}
command=/usr/local/bin/mongrel_cluster_ctl
command_args="$1 -c ${mongrel_cluster_config}"
restart_cmd="restart_cmd"
start_cmd="start_cmd"
stop_cmd="stop_cmd"
restart_cmd()
{
eval "${command} restart -c ${mongrel_cluster_config}"
}
start_cmd()
{
eval "${command} start -c ${mongrel_cluster_config}"
}
stop_cmd()
{
eval "${command} stop -c ${mongrel_cluster_config}"
}
run_rc_command "$1"

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def make(makedir)
Dir.chdir(makedir) do
sh(PLATFORM =~ /win32/ ? 'nmake' : 'make')
end
end
def extconf(dir)
Dir.chdir(dir) do ruby "extconf.rb" end
end
def setup_tests
Rake::TestTask.new do |t|
t.libs << "test"
t.test_files = FileList['test/test*.rb']
t.verbose = true
end
end
def setup_clean otherfiles
files = ['build/*', '**/*.o', '**/*.so', '**/*.a', 'lib/*-*', '**/*.log'] + otherfiles
CLEAN.include(files)
end
def setup_rdoc files
Rake::RDocTask.new do |rdoc|
rdoc.rdoc_dir = 'doc/rdoc'
rdoc.options << '--line-numbers'
rdoc.rdoc_files.add(files)
end
end
def setup_extension(dir, extension)
ext = "ext/#{dir}"
ext_so = "#{ext}/#{extension}.#{Config::CONFIG['DLEXT']}"
ext_files = FileList[
"#{ext}/*.c",
"#{ext}/*.h",
"#{ext}/extconf.rb",
"#{ext}/Makefile",
"lib"
]
task "lib" do
directory "lib"
end
desc "Builds just the #{extension} extension"
task extension.to_sym => ["#{ext}/Makefile", ext_so ]
file "#{ext}/Makefile" => ["#{ext}/extconf.rb"] do
extconf "#{ext}"
end
file ext_so => ext_files do
make "#{ext}"
cp ext_so, "lib"
end
end
def base_gem_spec(pkg_name, pkg_version)
pkg_version = pkg_version
pkg_name = pkg_name
pkg_file_name = "#{pkg_name}-#{pkg_version}"
Gem::Specification.new do |s|
s.name = pkg_name
s.version = pkg_version
s.platform = Gem::Platform::RUBY
s.has_rdoc = true
s.extra_rdoc_files = [ "README" ]
s.files = %w(COPYING LICENSE README Rakefile) +
Dir.glob("{bin,doc/rdoc,test,lib}/**/*") +
Dir.glob("ext/**/*.{h,c,rb}") +
Dir.glob("examples/**/*.rb") +
Dir.glob("tools/*.rb")
s.require_path = "lib"
s.extensions = FileList["ext/**/extconf.rb"].to_a
s.bindir = "bin"
end
end
def setup_gem(pkg_name, pkg_version)
spec = base_gem_spec(pkg_name, pkg_version)
yield spec if block_given?
Rake::GemPackageTask.new(spec) do |p|
p.gem_spec = spec
p.need_tar = true
end
end
def setup_win32_gem(pkg_name, pkg_version)
spec = base_gem_spec(pkg_name, pkg_version)
yield spec if block_given?
Gem::Builder.new(spec).build
end