https://github.com/electrocucaracha/k8s-nonpreemptingpriority-demo

PoC for undestanding NonPreemptingPriority Kubernetes Gate feature
https://github.com/electrocucaracha/k8s-nonpreemptingpriority-demo

kubernetes preemption priority-pod vagrant

Last synced: 20 days ago
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PoC for undestanding NonPreemptingPriority Kubernetes Gate feature

• Host: GitHub
• URL: https://github.com/electrocucaracha/k8s-nonpreemptingpriority-demo
• Owner: electrocucaracha
• Created: 2019-09-10T17:44:47.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-07-17T22:26:28.000Z (over 4 years ago)
• Last Synced: 2024-11-05T16:12:42.555Z (2 months ago)
• Topics: kubernetes, preemption, priority-pod, vagrant
• Language: Shell
• Homepage:
• Size: 293 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Kubernetes NonPreemptingPriority gate feature demo

[![Build Status](https://travis-ci.org/electrocucaracha/k8s-NonPreemptingPriority-demo.png)](https://travis-ci.org/electrocucaracha/k8s-NonPreemptingPriority-demo)

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

In Kubernetes, _Priority_ determines the importance of a Pod to other

Pods and _Preemption_ is the logic which tries to find a Node to

remove one or more low priority Pods to schedule a high priority Pod.

The goal of this project is to clarify those concepts through code

examples. This project deploys an All-in-One Kubernetes Cluster with

the `NonPreemptingPriority` feature gate enabled with the

[installer](installer.sh) bash script which is consumed by the

[Vagrantfile](Vagrantfile).

## Setup

This project uses [Vagrant tool][2] for provisioning Virtual Machines

automatically. It's highly recommended to use the  *setup.sh* script

of the [bootstrap-vagrant project][3] for installing Vagrant

dependencies and plugins required for its project. The script

supports two Virtualization providers (Libvirt and VirtualBox).

    $ curl -fsSL http://bit.ly/initVagrant | PROVIDER=libvirt bash

Once Vagrant is installed, it's possible to deploy the demo with the

following instruction:

    $ vagrant up

## Demo

After the All-in-One Kubernetes Cluster is deployed the

[installer](installer.sh) creates two kubernetes cron jobs with

different `PriorityClass` on their pods. The `trivial-job`

executes a counter job every minute and the `urgent-job` every three

minutes. They are using `preemptionPolicy: Never` to avoid any

preemption process.

![Demo screenshot](docs/src/img/watch_jobs.png )

As you can see, the jobs of the `urgent-job` have preference in the 

queue during the execution of the jobs without any preempt action over

the existing Pods of `trivial-job`.

[1]: https://github.com/kubernetes-sigs/kubespray

[2]: https://www.vagrantup.com/

[3]: https://github.com/electrocucaracha/bootstrap-vagrant