Procmon
Procmon is a process monitor written in Ruby. Concepts and design are based on Bluepill and God, but with emphasis on simplicity and extensibility.
Procmon allows you to check on processes and then perform arbitary actions based on the result of the checks. For example, you can send notification when mem usage is too high, or you can restart a process if it's dead, etc. It is not meant to run as a daemon. It is designed to be invoked manually or via cron.
Installation
It's hosted on [rubygems.org][rubygems].
sudo gem install procmon
Usage
require 'rubygems'
require 'procmon'
notifier = Proc.new do
puts "I NEED TO SEND OUT AN EMAIL"
end
notifier2 = Proc.new do
puts "I NEED TO SEND OUT AN SMS"
end
# action can be a Proc object. You can define whatever you want to do
Procmon.process("Mail") do |process|
process.checks :mem_usage, :above => 100.megabytes, :actions => [notifier, notifier2]
end
# You can specify a code block as well
Procmon.process("Mail") do |process|
process.pid = 29124
process.checks :mem_usage, :above => 100.megabytes do
puts "I'm in your base"
end
end
# Using built-in email notifier
NOTIFICATION_TARGET='ddao@example.com'
Procmon.process("Mail") do |process|
process.checks :mem_usage, :above => 100.megabytes, :actions => [Procmon::Notifiers::Email]
end
# Check if a process is alive
Procmon.process("libvirtd") do |process|
process.checks :process_health, :status => "down" do
puts "Oh no! My process is not running"
end
end
# Checking for percent cpu usage
Procmon.process("Mail") do |process|
process.checks :cpu_usage, :above => 90 do
puts "This process sure is busy!"
end
end
# You can have multiple checks in one process block
Procmon.process("Mail") do |process|
process.checks :cpu_usage, :above => 90 do
puts "This process sure is busy!"
end
process.checks :mem_usage, :above => 500.megabytes do
puts "Nom nom nom. I'm eating up all of the memory."
end
end
# Would be nice if we can do this as well
# Procmon.process("Mail") do |process|
# process.checks :mem_usage, :above => 100.megabytes do |action|
# action.perform(notifier)
# action.perform(Procmon::Notifiers::Email, 'someone@example.com')
# end
# process.checks :mem_usage, :above => 100.megabytes, :actions => [notifier, notifier2]
# process.checks :mem_usage, :above => 100.megabytes, :actions => [Procmon::Notifiers::Email]
#end