bin/check-cloudwatch-alarms.rb
#! /usr/bin/env ruby
#
# check-cloudwatch-alarms
#
# DESCRIPTION:
# This plugin raise a critical if one of cloud watch alarms are in given state.
#
# OUTPUT:
# plain-text
#
# PLATFORMS:
# Linux
#
# DEPENDENCIES:
# gem: aws-sdk
# gem: sensu-plugin
#
# USAGE:
# ./check-cloudwatch-alarms --name-prefix "staging"
# ./check-cloudwatch-alarms --exclude-alarms "CPUAlarmLow"
# ./check-cloudwatch-alarms --aws-region eu-west-1 --exclude-alarms "CPUAlarmLow"
#
# NOTES:
#
# LICENSE:
# Copyright (c) 2017, Olivier Bazoud, olivier.bazoud@gmail.com
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.
#
require 'sensu-plugin/check/cli'
require 'sensu-plugins-aws/common'
require 'aws-sdk'
class CloudWatchCheck < Sensu::Plugin::Check::CLI
include Common
option :aws_region,
short: '-r AWS_REGION',
long: '--aws-region REGION',
description: 'AWS Region (defaults to us-east-1).',
default: 'us-east-1'
option :state,
description: 'State of the alarm',
short: '-s STATE',
long: '--state STATE',
default: 'ALARM'
option :name_prefix,
description: 'Alarm name prefix',
short: '-p NAME_PREFIX',
long: '--name-prefix NAME_PREFIX',
default: ''
option :exclude_alarms,
description: 'Exclude alarms',
short: '-e EXCLUDE_ALARMS',
long: '--exclude-alarms',
proc: proc { |a| a.split(',') },
default: []
def run
client = Aws::CloudWatch::Client.new
options = { state_value: config[:state] }
unless config[:name_prefix].empty?
options[:alarm_name_prefix] = config[:name_prefix]
end
alarms = client.describe_alarms(options).metric_alarms
if alarms.empty?
ok "No alarms in '#{config[:state]}' state"
end
config[:exclude_alarms].each do |x|
alarms.delete_if { |alarm| alarm.alarm_name.match(x) }
end
critical "#{alarms.size} in '#{config[:state]}' state: #{alarms.map(&:alarm_name).join(',')}" unless alarms.empty?
ok 'everything looks good'
rescue StandardError => e
puts "Error: exception: #{e}"
critical
end
end