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#!/usr/bin/env ruby
pod=<<-POD
=head1 NAME
passenger_memory_stats - Munin plugin to monitor the memory usage of passenger application servers.
Monitors the memory consumed by passenger instances.
=head1 APPLICABLE SYSTEMS
All systems that have passenger installed.
=head1 CONFIGURATION
The plugin needs to execute passenger-memory-stats.
This configuration section shows the defaults of the plugin:
[passenger_*]
user root
command /usr/local/bin/ruby %c
Options
env.passenger_memory_stats '/path/to/passenger-memory-stats' # Path to passenger memory status.
env.graph_category 'App' # Graph Category. Defaults to App.
ln -s /usr/share/munin/plugins/passenger_memory_stats /etc/munin/plugins/passenger_memory_stats
=head1 INTERPRETATION
The plugin shows the memory consumed by passenger instances.
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=head1 VERSION
1.5
=head1 BUGS
None known
=head1 AUTHOR
Ilya Lityuga
Bart ten Brinke - railsdoctors.com
=head1 LICENSE
MIT
POD
# Globals
GRAPH_CATEGORY = ENV['graph_category'] || 'App'
PASSENGER_MEMORY_STATS = ENV['passenger_memory_stats'] || '/usr/local/bin/passenger-memory-stats'
# Check if this plugin can run
def autoconf
begin
require 'rubygems'
gem "passenger", ">=2.0"
rescue Exception => e
puts "no (Gem not found: #{e})"
exit 1
end
status = `#{PASSENGER_MEMORY_STATS}`
unless $?.success?
puts "no (error when executing #{PASSENGER_MEMORY_STATS})"
exit 1
end
puts "yes"
exit 0
end
# Describe the graph config
def config
status = `#{PASSENGER_MEMORY_STATS}`
memory_info = open('/proc/meminfo', 'r') do |lines|
lines.inject({}) do |h, line|
matched = line.match(/^([\w_\(\)]+):\s+(\d+)/)
h[matched[1].to_sym] = matched[2].to_i * 1024
h
end
end
upper_limit = memory_info[:MemTotal]
puts <<-CONFIG
graph_category #{GRAPH_CATEGORY}
graph_title Passenger memory stats
graph_vlabel Bytes
graph_args --base 1000 -l 0 --upper-limit #{upper_limit}
graph_info The memory used by passenger instances on this application server
memory.label memory
CONFIG
exit 0
end
# Collect the data
# <tt>debug</tt> Show debug information
def run(debug = false)
stats = `#{PASSENGER_MEMORY_STATS}`
unless $?.success?
$stderr.puts "failed executing passenger-memory-stats"
exit 1
end
puts stats if debug
#### Total private dirty RSS: 81.81 MB
stats =~ /RSS:\s*([\d\.]+)\s*MB\Z/m
memory = ($1.to_f * 1024 * 1024).to_i
puts "memory.value #{memory}"
end
# Main
if ARGV[0] == "config"
config
elsif ARGV[0] == "autoconf"
autoconf
elsif ARGV[0] == "debug"
run(true)
else
run
end
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