This is AngryMob
AngryMob (AM) is the automated system configuration component of YesMaster.
- convenient configuration data (
- idempotent code to ensure the configuration of the parts of a system (
- and a method of controlling the flow of the setup (
AngryMob values having:
- zero external dependencies.
- a small, simple core.
Having zero external dependencies means that AM can be used from the very moment a bare ruby interpreter is installed on a server.
A small, simple core means that debugging and testing the code is simplified. It also allows AM to be embedded directly into other projects.
Please note that AngryMob is a reaction to Chef. Despite this, I retain the utmost respect the Chef movement and the guys who've built it.
AM purposely omits or eschews the following features you might be familiar with from Chef:
- The client and server and its dependencies. AM operates similarly to "chef-solo" or is combined with other components for network based "chef-client"-like operation.
- A built in, fixed cookbook layout and metadata. You can define your own ResourceLocator, or use the basic supplied one.
- A single copy nirvana implementation. Again, define it yourself if you want it.
- The puppet resource/provider separation. I don't have a particular solution to supporting multiple operating systems, but its strongly YAGNI for now.
- Exhaustive system discovery like Ohai. I think Ohai is great, but running it before every AM run to find the hostname and IP is excessive.
- Type-checking of data. This is ruby, where ducks rule the roost.
AngryMob is young and fluid, but I'm using it a lot in the maintainence of VPSes at PLUS2.
In particular, AM lacks any unit-level specs or tests so far. The servers it maintains are valid functional testing in my eyes ;)
nodeis a glob of data representing the thing you're configuring.
targetsare things you want to configure.
actsare groups of target invocations. They can also schedule the execution of other acts.
mobsare groups of acts and targets.
The Node is a place to hang your data. In essence its a
Hash (though more specifically its an AngryHash, which is similar to
Targets are parts of the server which you want to configure, for example:
Note the targets interface is likely to change soon. Its overly complicated right now.
Targets perform a similar role to Chef/puppet resource/providers.
TODO talk about Target definition dsl and SingletonTargets
Acts are groups of targets. They're conceptually similar to a rake task. Subsequent acts can be scheduled.
Mobs are groups of target definitions and acts. They can be mixed and matched.
A small toolkit of handy targets:
- template - ERB
- apt - apt-get package
- gem - a rubygem
- block - a ruby block
- sh - a shell command
- service - a super-class for defining ubuntu service targets
The mob command
"chef-solo"-like command for setting an AngryMob on your server.
It lives at http://github.com/plus2/angry_mob.
Please try it out and send us feedback via the github page.
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