Chef and ohai.

The guys at Opscode recently released ohai and Chef. ohai “Ohai profiles your system and emits JSON” and “Chef is a systems management framework masquerading as a configuration management tool.” Ezra Zygmuntowicz explains the details over here. I decided to check out ohai today here’s what I came up with.

First, just for fun I wrote a little rack server that serves up the JSON that ohai produces.

require ‘rubygems’
require ‘rack’

class OhaiRack
def call(env)
data = IO.popen(”ohai”)
info = data.readlines
[200, {"Content-Type"=>"text/plain"}, [”#{info.join}”]]
end
end

app = Rack::Builder.new {
use Rack::CommonLogger, STDERR
run OhaiRack.new
}.to_app

server = Rack::Handler::Mongrel
options = {:Host => “127.0.0.1″, :Port => 3000}
server.run app, options

I also wrote a erlang plugin so that ohai can get the version and details about your erlang installation. I put the following code in /usr/lib/ruby/gems/1.8/gems/ohai-0.1.2/lib/ohai/plugins/erlang.rb, your location may be different depending on your ruby and/or gems installation location.

require_plugin “languages”
require “open3″

languages[:erlang] = Mash.new

stdin, stdout, stderr = Open3.popen3(’erl +V’)

output = stderr.gets
info = output.split

languages[:erlang][:version] = info[5]
languages[:erlang][:options] = info[1]
languages[:erlang][:emulator] = info[2]

The output should look something like:

“erlang”: {
“name”: “Erlang”,
“version”: “5.6.5″,
“emulator”: “(BEAM)”,
“options”: “(SMP,ASYNC_THREADS,HIPE)”

Anywho, kinda fun and worth checking out, especially if you are working on the cloud.

Comments

Seems like a less-featured copy of puppet.

Posted by chuck on 19 Jan 2009 at 03:59

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