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readme.md

Prometheus Kubernetes Autoscaler

Scale Kubernetes deployments based on Prometheus alerts.

How does it work?

The autoscaler is registered as a webhook alertmanager receiver. When an alert is forwarded to this receiver the alertmanager will contact the autoscaler.
The notifications send by the alertmanager need to contain these annotations:

alertmanager-config.yaml:
global:
    resolve_timeout: 5m

route:
    group_by: ['service']
    group_wait: 10s
    group_interval: 10s 
    repeat_interval: 1h
    receiver: 'webhook'
receivers:
- name: 'webhook'
    webhook_configs:
    - url: 'http://prometheus-kubernetes-autoscaler-go/alert
name description
deployment name of the deployment that should be scaled
action scaling that should be performed. Either up or down

Installation

To run this project you need the following tools:

  1. Run helmfile sync to install the alertmanager
  2. Run draft up to install the autoscaler
  3. Port-forward the alertmanager api to localhost:9093.
  4. Run generate-alert.sh to generate an alert and watch the scaling happen

License

MIT License

Copyright (c) 2018 Lukas Eichler

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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