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README
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Custom Pod Autoscaler
This is the Custom Pod Autoscaler (CPA) code and base images.
The CPA is part of the Custom Pod Autoscaler Framework.
What is it?
A Custom Pod Autoscaler is a Kubernetes autoscaler that is customised and user created. Custom Pod Autoscalers are designed to be similar to the Kubernetes Horizontal Pod Autoscaler. The Custom Pod Autoscaler framework allows easier and faster development of Kubernetes autoscalers.
A Custom Pod Autoscaler can be created by using this project, extending the Docker base images provided and inserting your own logic; see the examples for more information.
How does it work?
A Custom Pod Autoscaler has a base program (defined in this repository) that handles interacting with user logic, for example by using shell commands and piping data into them.
When developing a Custom Pod Autoscaler you define logic for two stages:
- Metric gathering - collecting or generating metrics; can be calling metrics APIs, running calculations locally, making HTTP requests.
- Evaluating metrics - taking these gathered metrics and using them to decide how many replicas a resource should have.
These two pieces of logic are all the custom logic required to build a Custom Pod Autoscaler, the base program will handle all Kubernetes API interactions for scaling/retrieving resources.
Getting started
Check out this getting started guide for a quick start for developers.
More information
See the wiki for more information, such as guides and references.
Developing this project
Environment
Developing this project requires these dependencies:
To view docs locally, requires:
Commands
make- builds the CPA binary.make docker- builds the CPA base images.make lint- lints the code.make unittest- runs the unit tests.make vendor- generates a vendor folder.make doc- hosts the documentation locally, at127.0.0.1:8000.
Directories
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| Path | Synopsis |
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api
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v1
Package v1 provides routing and endpoints for the Custom Pod Autoscaler HTTP REST API version 1.
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Package v1 provides routing and endpoints for the Custom Pod Autoscaler HTTP REST API version 1. |
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Package autoscaler provides methods for scaling a resource - by triggering metric gathering, feeding these metrics to an evaluation and using this evaluation to scale the resource.
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Package autoscaler provides methods for scaling a resource - by triggering metric gathering, feeding these metrics to an evaluation and using this evaluation to scale the resource. |
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cmd
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custom-pod-autoscaler
Custom Pod Autoscaler is the core program that runs inside a Custom Pod Autoscaler Image.
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Custom Pod Autoscaler is the core program that runs inside a Custom Pod Autoscaler Image. |
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Package config handles parsing YAML and environment variable input into a Custom Pod Autoscaler configuration file.
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Package config handles parsing YAML and environment variable input into a Custom Pod Autoscaler configuration file. |
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Package evaluate provides functionality for managing evaluating, calling external evaluation logic through shell commands with relevant data piped to them.
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Package evaluate provides functionality for managing evaluating, calling external evaluation logic through shell commands with relevant data piped to them. |
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example
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simple-pod-metrics-golang
Module
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shell
Package shell handles interactions with the OS shell
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Package shell handles interactions with the OS shell |
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Package metric provides functionality for managing gathering metrics, calling external metric gathering logic through shell commands with relevant data piped to them.
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Package metric provides functionality for managing gathering metrics, calling external metric gathering logic through shell commands with relevant data piped to them. |
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Package scale abstracts interactions with the Kubernetes scale API, providing a consistent way to scale resources that are supported by the Custom Pod Autoscaler.
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Package scale abstracts interactions with the Kubernetes scale API, providing a consistent way to scale resources that are supported by the Custom Pod Autoscaler. |