New Feature: Failed Mode

CHANGELOG.md

@@ -5,6 +5,11 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+### Added
+- added 'failed mode'. This Mode checks all systemd service and reports only CRITICAL if any service has state "failed" (@Seji64)
+
+### Fixed
+- check-systemd.rb: NilClass Exception when no service (-s) is set (@Seji64)
 
 ## [0.1.0] - 2017-09-10
 ### Added

README.md

@@ -15,6 +15,13 @@ Pass services as a comma delimited -s option
 check-systemd.rb -s SERVICE1.service,SERVICE2.service
 ```
 
+### Usage/example failed mode
+All services with state 'failed' will be reported as CRITICAL except kdump.service
+
+```
+check-systemd.rb -f -i kdump.service
+```
+
 ## Installation
 
 [Installation and Setup](http://sensu-plugins.io/docs/installation_instructions.html)

bin/check-systemd.rb

@@ -16,6 +16,8 @@
 #
 # USAGE:
 # -s SERVICE - Services to check delimited by commas
+# -f Toogle 'failed mode'
+# -i SERVICES - Services to ignore in 'failed mode'. delimited by commas
 #
 # LICENSE:
 #   Chris McFee <cmcfee@kent.edu>
@@ -24,20 +26,35 @@
 #
 
 require 'sensu-plugin/check/cli'
-
 #
 #  Check systemd services
 #
 class CheckSystemd < Sensu::Plugin::Check::CLI
   option :services,
          short: '-s SERVICES',
-         proc: proc { |a| a.split(',') }
+         proc: proc { |a| a.split(',') },
+         default: [],
+         description: 'comma seperated list of services to check. ignored if --failed is set'
+  option :failed,
+         short: '-f',
+         boolean: true,
+         default: false,
+         long: '--failed',
+         description: 'all services are being checked. One or more failed => CRITICAL'
+  option :failed_ignore,
+         short: '-i SERVICES',
+         proc: proc { |a| a.split(',') },
+         default: [],
+         long: '--failed-ignore',
+         description: 'comma seperated list of services which should be ignored when using --failed mode'
 
   # Setup variables
   #
   def initialize
     super
     @services = config[:services]
+    @failed = config[:failed]
+    @failed_ignore = config[:failed_ignore]
     @crit_service = []
   end
 
@@ -53,7 +70,8 @@ def unit_services
     service_array = []
     systemd_output.split("\n").each do |line|
       line_array = line.split(' ')
-      next unless @services.any? { |service| line_array[0].include?(service) }
+      next unless @services.any? { |service| line_array[0].include?(service) } || @failed == true
+      next if @failed_ignore.any? { |service| line_array[0].include?(service) } && @failed == true
       service_hash = {}
       service_hash['name'] = line_array[0]
       service_hash['load'] = line_array[1]
@@ -66,8 +84,13 @@ def unit_services
   end
 
   def check_systemd
-    @services.reject { |service| validate_presence_of(service) }.each do |gone|
-      @crit_service << "#{gone} - Not Present"
+    unless @services.nil?
+      @services.reject { |service| validate_presence_of(service) }.each do |gone|
+        @crit_service << "#{gone} - Not Present"
+      end
+    end
+    if @services.none? && @failed == false
+      critical 'You must define services to check!'
     end
 
     unit_services.each do |service|

lib/sensu-plugins-systemd.rb

@@ -1,2 +1 @@
-
 require 'sensu-plugins-systemd/version'

sensu-plugins-systemd.gemspec

@@ -1,4 +1,4 @@
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'date'
@@ -24,7 +24,6 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.summary       = 'This provides functionality to check systemd services.'
   s.description   = 'Plugins to provide functionality to check systemd services for Sensu, a monitoring framework'
   s.license       = 'MIT'
-  s.has_rdoc      = false
   s.require_paths = ['lib']
   s.files         = Dir.glob('{bin,lib}/**/*') + %w[LICENSE README.md CHANGELOG.md]
   # s.test_files    = Dir['test/*.rb']
@@ -40,7 +39,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.add_development_dependency 'pry',                       '~> 0.10'
   s.add_development_dependency 'rake',                      '~> 10.5'
   s.add_development_dependency 'redcarpet',                 '~> 3.2'
-  s.add_development_dependency 'rubocop',                   '~> 0.37'
   s.add_development_dependency 'rspec',                     '~> 3.4'
+  s.add_development_dependency 'rubocop',                   '~> 0.37'
   s.add_development_dependency 'yard',                      '~> 0.8'
 end