start.rb

#! /usr/bin/env ruby

require 'fileutils'

$pids = []
$first_child = true

def kill_all
  $pids.each do |pid|
    begin
      puts "Killing #{pid}..."
      Process.kill(:INT, pid)
    rescue Exception, Errno::ECHILD
    end
  end
  $pids = []

  Process.waitall
end

# Handle dead children
trap("SIGCHLD") { 
  begin
    next unless $first_child
    $first_child = false
    child_pid = Process.waitpid(-1, Process::WNOHANG)

    puts "Atleast one Redis process died. Let's stop all and bail out. (pid=#{child_pid})"
    exit
  rescue Errno::ECHILD
  end
}

# Catch Ctrl-C
trap("SIGINT") { 
  $first_child = false
  exit 
}

# On exit, make sure all Redis instances are killed
at_exit { kill_all }

sentinel_conf = "sentinel/sentinel.conf.tmpl"
unless File.exist?(sentinel_conf)
  puts "Please make sure that the Sentinel config template is available in #{sentinel_conf}"
  exit 2
end

dirs =["r1", "r2", "r3", "s1", "s2", "s3"]

dirs.each do |dir|
  FileUtils.mkdir_p("sentinel/#{dir}")

  if dir.start_with?("s")
    FileUtils.cp(sentinel_conf, "sentinel/#{dir}/sentinel.conf")
  end
end

# Masters
Dir.chdir("sentinel/r1") { $pids << spawn("redis-server --port 6380") }
#$pids << spawn("redis-server --port 6381")

# Slaves of Master 1
Dir.chdir("sentinel/r2") { $pids << spawn("redis-server --port 63800 --slaveof 127.0.0.1 6380") }
Dir.chdir("sentinel/r3") { $pids << spawn("redis-server --port 63801 --slaveof 127.0.0.1 6380") }

# Slaves of Master 2
#$pids << spawn("redis-server --port 63810 --slaveof 127.0.0.1 6381")
#$pids << spawn("redis-server --port 63811 --slaveof 127.0.0.1 6381")

# Sentinels
Dir.chdir("sentinel/s1") { $pids << spawn("redis-server sentinel.conf --sentinel --port 26379") }
Dir.chdir("sentinel/s1") { $pids << spawn("redis-server sentinel.conf --sentinel --port 26380") }
Dir.chdir("sentinel/s1") { $pids << spawn("redis-server sentinel.conf --sentinel --port 26381") }

sleep 5
$first_child = false

Process.waitall