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https://github.com/jnewland/pulse

pls see https://github.com/railsmachine/pulse
https://github.com/jnewland/pulse

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pls see https://github.com/railsmachine/pulse

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h1. Pulse

Pulse adds an action to your rails project that can be used for external health checking. The most common use is by a http proxy such as "haproxy":http://haproxy.1wt.eu/ or a monitoring tool such as "god":http://god.rubyforge.org.

h3. Authors

* "Paul Gross":http://www.prgs.net
* "Jesse Newland":http://jnewland.com
* "Josh Nichols":http://technicalpickles.com

h2. Requirements

* Rails
* MySQL, Postgres, or sqlite

h2. Installation

h3. Rails 3.x

Just add the gem to your @Gemfile@ and then @bundle install@:



gem 'rails-pulse'

In your @config/routes.rb@:



pulse
# or customize the URL
pulse '/admin/pulse'

h3. Rails 2.x

In your @config/environment.rb@:



config.gem 'rails-pulse', :source => "http://gemcutter.org/", :lib => "pulse"

Install the gem:



cd RAILS_ROOT
rake gems:install

Finally, add a route to config/routes.rb:



map.pulse
# or customize the URL
map.pulse '/admin/pulse'

This configures pulse to work at the 'pulse' URL. If you would rather use a different URL:



map.pulse 'some/other/url'

h2. haproxy configuration

haproxy can be configured to use the /pulse url for its health checking. Just add:



option httpchk GET /pulse



listen rails :9000
server rails-1 localhost:8000 maxconn 1 check inter 20000 fall 1
server rails-2 localhost:8001 maxconn 1 check inter 20000 fall 1
...

h2. god configuration

You are using god to watch your mongrels, right?

In your mongrel watch, add the following restart condition:



w.restart_if do |restart|
...
restart.condition(:http_response_code) do |c|
c.code_is_not = 200
c.host = 'localhost'
c.path = '/pulse'
c.port = 8000
c.timeout = 5.seconds
c.interval = 20.seconds
end
end

Also make sure to give your mongrels a nice grace period.



...
w.start_grace = 90.seconds
w.restart_grace = 90.seconds
...

For a complete god configuration example, check out my "god_examples project":http://github.com/jnewland/god_examples and the included "sample rails god config":http://github.com/jnewland/god_examples/tree/master/rails/config/god/app.god.

h2. License

Released under "Ruby's license":http://www.ruby-lang.org/en/LICENSE.txt