Munin plugins for Passenger

munin_passenger_plugins

Munin plugins for Passenger:

- Put the files passenger_status and passenger_memory_status in /etc/munin/plugins
- Configure the Passenger instance registry directory in Apache, nginx or Passenger Standalone to /var/run/passenger
- Edit /etc/munin/plugin-conf.d/munin-node to include:
  [passenger_*]
   user root
   env.PASSENGER_INSTANCE_REGISTRY_DIR /var/run/passenger
   command ruby %c
- Restart munin-node

passenger_memory_status

#!/usr/bin/env ruby
# put in /etc/munin/plugins and restart munin-node
# Adapted from Dan Manges, http://www.dcmanges.com/blog/rails-application-visualization-with-munin
# NOTE: you might need to add munin to allow passwordless sudo for passenger-memory-stats

def output_config
  puts <<-END
graph_category passenger
graph_title Passenger memory stats
graph_vlabel count
memory.label memory
END
  exit 0
end

def output_values
  status = `/usr/sbin/passenger-memory-stats | tail -1`
  unless $?.success?
    $stderr.puts "failed executing passenger-memory-stats"
    exit 1
  end
  status =~ /(\d+\.\d+)/
  puts "memory.value #{$1}"
end

if ARGV[0] == "config"
  output_config
else
  output_values
end

passenger_status

#!/usr/bin/env ruby
# put in /etc/munin/plugins and restart munin-node
# Adapted from Dan Manges, http://www.dcmanges.com/blog/rails-application-visualization-with-munin
# NOTE: you might need to add munin to allow passwordless sudo for passenger-status

def output_config
  puts <<-END
graph_category passenger
graph_title passenger status
graph_vlabel count
sessions.label sessions
max.label max processes
running.label running processes
active.label active processes
END
  exit 0
end

def output_values
  status = `/usr/sbin/passenger-status`
  unless $?.success?
    $stderr.puts "failed executing passenger-status"
    exit 1
  end
  status =~ /Max pool size\s+:\s+(\d+)/
  puts "max.value #{$1}"

  status =~ /App groups\s+:\s+(\d+)/
  puts "running.value #{$1}"

  status =~ /Processes\s+:\s+(\d+)/
  puts "active.value #{$1}"

  total_sessions = 0
  status.scan(/Sessions: (\d+)/).flatten.each { |count| total_sessions += count.to_i }
  puts "sessions.value #{total_sessions}"
end

if ARGV[0] == "config"
  output_config
else
  output_values
end