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Circuit Overview

A circuit is a chef ruby-dsl based model of some application or service. It contains the model of what resources / components are required, optional and how they relate to each other. Two common relations are depends_on and managed_via. An architect would usually design a pack to capture best practices for the different availablity modes / operational modes.

An example would be a tomcat circuit. In the circuit file it would contain a compute, java, tomcat, and artifacts and/or build components and describe the dependencies and where they run (managed_via relation).

A prior name of a circuit was a pack. Whenever you see the term pack in oneops, its the same thing as a circuit.

Circuit repo

The basic circuit repo is: https://github.com/oneops/circuit-oneops-1

It contains 3 primary directories for the models:

  1. /components - which can be implmented in chef cookbooks, puppet modules, and soon ansible playbooks. Each component has a doc dir which has the image the ui will use for the component.
  2. /clouds - default / templates for clouds and cloud services.
  3. /packs - the directory with all the packs/circuits

Load content

There is a circuit command which is part of the oneops-admin gem. This circuit command is used to load content / the model.

Download and install the latest gem from the build server or build yourself from https://github.com/oneops/oneops-admin

advanced option to use object store backed images and docs, is to modify the circuit repos .chef/knife.rb with some object store config. Example lines to add to circuit-oneops-1/.chef/knife.rb:

object_store_provider 'OpenStack'
object_store_user 'oneops'
object_store_pass 'redacted'
environment_name 'int-1503'

Then to perform the content upload, aka model sync:

cd /opt/oneops
circuit create
cd circuit
# this will load the base model / classes and relationships.
circuit init
cd /opt/oneops/circuit-oneops-1
# this runs knife model sync, knife pack sync and knife cloud sync
circuit install