joemiller

#!/bin/sh
# chkconfig: 2345 20 80
# description: sensu-api

. /lib/lsb/init-functions

start() {
  source "/usr/local/rvm/scripts/rvm"
  rvm use ruby-1.9.2-p290\@sensu
  nohup sensu-api &

joemiller

# sensu-server -vconfiguration valid -- running server

/usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/amqp-0.7.4/lib/amqp/channel.rb:833:in `block (3 levels) in send': The channel 1 was closed, you can't use it anymore! (AMQP::ChannelClosedError)
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/amqp-0.7.4/lib/amqp/channel.rb:826:in `each'
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/amqp-0.7.4/lib/amqp/channel.rb:826:in `block (2 levels) in send'
	from <internal:prelude>:10:in `synchronize'
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/amqp-0.7.4/lib/amqp/channel.rb:825:in `block in send'
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/eventmachine-1.0.0.beta.4/lib/em/deferrable.rb:48:in `call'
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/eventmachine-1.0.0.beta.4/lib/em/deferrable.rb:48:in `callback'
	from /usr/local/rvm/gems/ruby-1.9.2-p290@sensu/gems/amqp-0.7.4/lib/amqp/channel.rb:824:in `send'

joemiller

{
  "checks": {
    "graphite_test1": {
      "type": "metric",
      "command": "/etc/sensu/plugins/graphite_test1.rb",
	  "subscribers": [ "role_sensu_server" ],
      "interval": 10,
      "handlers": ["graphite"]
    }
  }

joemiller

root@natty:/# sensu-server -h
Usage: sensu-server [options]
    -h, --help                       Display this screen
    -w, --worker                     Only consume jobs, no check publishing (default: false)
    -c, --config FILE                Sensu JSON config FILE (default: /etc/sensu/config.json)
    -d, --config_dir DIR             Directory for supplemental Sensu JSON config files (default: /etc/sensu/conf.d/)
    -l, --log FILE                   Sensu log FILE (default: /tmp/sensu.log)
    -v, --verbose                    Enable verbose logging (default: false)
    -b, --background                 Fork into backgaround (daemon) (default: false)
    -p, --pid_file FILE              Sensu PID FILE (default: /tmp/sensu.log)

joemiller

/var/lib/gems/1.8/gems/sensu-0.8.19/lib/sensu/helpers/redis.rb:5:in `unpack_sockaddr_in': can't convert nil into String (TypeError)
	from /var/lib/gems/1.8/gems/sensu-0.8.19/lib/sensu/helpers/redis.rb:5:in `connection_completed'
	from /var/lib/gems/1.8/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run_machine'
	from /var/lib/gems/1.8/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run'
	from /var/lib/gems/1.8/gems/sensu-0.8.19/lib/sensu/server.rb:15:in `run'
	from /var/lib/gems/1.8/gems/sensu-0.8.19/bin/sensu-server:16
	from /var/lib/gems/1.8/bin/sensu-server:19:in `load'
	from /var/lib/gems/1.8/bin/sensu-server:19

joemiller

require 'daemons/daemonize'

module Sensu
  VERSION = "0.8.19"
  
  def self.write_pid(pid_file)
    File.open(pid_file, 'w') { |f| f.write(Process.pid.to_s + "\n") }
  end
  
  def self.daemonize(log_file)

joemiller

    DEFAULT_OPTIONS = {
      :log_file => '/tmp/sensu.log',
      :config_file => '/etc/sensu/config.json',
      :config_dir => '/etc/sensu/conf.d',
      :pid_file => '/tmp/' + $0.split('/').last + '.pid'
      :validate => true,
      :daemonize => false,
    }

joemiller

Intro
- Ruby-based, messaging-oriented, modern monitoring system
- based around rabbitmq
- goal, lightweight, small, low LOC (<1200 ?)
- "the monitoring router"

Concepts
- sensu-server
  - handlers
  - subscriptions

joemiller

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joemiller

#### install rabbitmq
We will use the rabbit install guide from: http://www.rabbitmq.com/install-rpm.html

The EPEL-5 yum repo contains the older R12B version of Erlang which would work fine ok with rabbit except we wouldn't have access to some of the nice management plugins nor SSL. Thus, we'll be installing a newer Erlang from the `epel-erlang` repo. We still need the EPEL-5 repo for some dependencies so we will install both repos.

    sudo rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm
    sudo wget -O /etc/yum.repos.d/epel-erlang.repo http://repos.fedorapeople.org/repos/peter/erlang/epel-erlang.repo
    sudo yum install erlang
    
Download rabbitmq rpm from rabbitmq and install: