corc

Note, corc is a small project that is currently under development for providing a set of tools for managing infrastructure components.

corc is a tool for conducting a range of operations for managing infrastructure components via a set of supported providers. Each provider is defined as a seperate plugin that can be installed and utilized by corc. The list of components that corc exposes are:

• Configurer
• Compute
• Orchestration
• Storage

Currently, the set of plugins/providers is very limited, and the initial development is focused on the area of orchestration and the associated libvirt_provider plugin.

However, plugin/provider contributions for each of these components are very welcome.

Installation

Installation from pypi:

pip install corc

Installation from local git repository:

cd corc
pip install .

If you have cloned the repo, an alternative way to install corc is to run:

make install

Which will create a virtual environment, install the required dependencies, and install corc itself.

Usage

Since corc is a top level interface for managing infrastucture components, specialized providers that provide the specific implementation have to be installed. To accomplish this, each of the different corc components define the add_provider and remove_provider arguments that can be used to install and remove providers:

usage: corc orchestration [-h] {add_provider,remove_provider,pool,stack} ...

options:
  -h, --help            show this help message and exit

COMMAND:
  {add_provider,remove_provider,pool,stack}

For instance, if we want to add the libvirt_provider to the orchestration component, we can do so by running:

corc orchestration add_provider libvirt_provider

Orchestrator Stacks and Pools

As part of the orchestration component, corc defines the concepts of stacks and pools. A stack is a collection of resources that are managed and orchestrated by corc.

Stacks are expected to defined as a yaml file that are passed to corc, which is used to orchestrate a set of resources.

A pool is a construct that can be used to logically group resources. When a pool is constructed, it is saved to a local state file where the pool is constructed.

When defining a stack as a yaml file, it is supported that pools are defined as part of the stack. An example of a stack yaml definition can be seen in the examples/stack.yml

The corc orchestration CLI can be used to manage both stacks and `pools`:

:~ corc orchestration -h
usage: corc orchestration [-h] {add_provider,remove_provider,pool,stack} ...

options:
-h, --help            show this help message and exit

COMMAND:
{add_provider,remove_provider,pool,stack}

When a stack is deployed, corc will orchestrate the defined resources, create the specified pools if nonexistent, and associate resources to their specific pools.