1 of 23

​

Multi-Cloud�Global Content Distribution�at Cloud Native Speeds

​

Jiri Kremser, Yury Tsarev

@JirkaKremser @xnullz @k8gb_io

#ossummit

2 of 23

Software engineer and open-source enthusiast currently working on kedify.io. He is a contributor/maintainer of k8gb project.

​

Previously GiantSwarm.io, ABSA, Red Hat, etc.

​

github.com/jkremser

x.com/JirkaKremser

​

​

dev at Kedify.io

Jiri Kremser

3 of 23

An active contributor to the Kubernetes and Crossplane ecosystems, Yury has worked with leading firms in Linux distribution, big data, video streaming, consulting, and finance. Yury joined Upbound to spearhead the control plane revolution in cloud-native infrastructure.�Creator of k8gb project.

​

https://github.com/ytsarev

https://www.linkedin.com/in/yurytsarev/

​

Principal Solutions Architect at Upbound

Yury Tsarev

4 of 23

Open Source Global Content Distribution

  • Traditional GSLB (Global Server Load Balancing) solutions are often locked into proprietary cloud vendor ecosystems.

​

  • We're here to change the game by providing a solution that is:
    • Open Source
    • Cloud Native
    • Vendor Neutral
    • Multi Cloud, including private clouds and on-premise data centers
    • API-driven for seamless integration with Kubernetes

​

  • Introducing K8GB: The open-source solution transforming how we approach multi-cloud GSLB. Let's dive into how it works.

5 of 23

Project Overview

6 of 23

Kubernetes Global Balancer - k8gb.io

​

​

✅ Handles high impact regional failures

​

✅ DNS-based global traffic steering

�✅ Simple Gslb CRD

​

✅ No Management Cluster

​

✅ No Single Point of Failure

​

✅ Multiple global load balancing strategies

7 of 23

K8GB Project History

​

✅ Originated in Absa to solve the need for cloud native GSLB solution

​

✅ Ability to route traffic to geographically dispersed clusters

​

✅ Response to workload state on a pod health level

​

✅ Designed to replace proprietary vendor solutions

​

✅ K8GB was started in the end of 2019 as OSS project from day 0

8 of 23

Use Case 1.1: Handling Regional Failure

​

9 of 23

Use Case 1.2: Handling Regional Failure

​

​

​

10 of 23

Use Case 1.3: Handling Regional Failure

​

11 of 23

Use Case 2: Spread Load Over Multiple Regions

​

​

​

12 of 23

Use Case 3: Multi-Region Content Distribution

​

​

​

13 of 23

K8GB Components

​

​

Embedded custom CoreDNS to serve DNS requests

​

Integrated ExternalDNS to automatically configure Zone Delegation

� K8GB controller to coordinate the logic according to the GSLB strategy

14 of 23

15 of 23

Simple Way to Control Global Traffic

16 of 23

Multiple Integrations

​

K8GB is architected to run on top of any CNCF-conformant K8s cluster�and Ingress controller, Istio Virtual Service, GatewayAPI is on the roadmap

​

✅ Operates in any on-prem, cloud or hybrid scenarios

​

✅ Supported external DNS providers for full zone delegation automation:

​

✅ AWS Route53

​

✅ Azure Public DNS

​

✅ NS1

​

✅ Infoblox

​

✅ Cloudflare

​

✅ RFC2136 implementations (e.g. Bind/Windows DNS)

​

17 of 23

Global Load Balancing Strategies

✅ roundRobin�

​

​

​

​

​

​

✅ weightedRoundRobin

✅ failover

​

​

​

​

​

​

​

✅ geoip

50% 30% 20%

18 of 23

GEOIP Strategy

​

✅ Works with MaxMind DB format��✅ GeoLite2 Free Geolocation Data

�✅ Custom MMDB file for private networks

​

✅ Checks edns0 CLIENT-SUBNET option

​

✅ For client’s ip fetches a tag like country.iso_code or continent.code from MMDB

​

✅ Returns matching DNS Endpoints (with the same tag)

​

✅ The advanced strategy logic is handled by CoreDNS CRD Plugin

� Caveat: Cloudflare as a resolver on the client side doesn’t support this, Google does

​

​

​

​

​

19 of 23

Demo

script & source

20 of 23

Demo Setup

​

GKE cluster

in US

EKS cluster

in EU

EU’s nginx: 18.132.100.90

​

US’ nginx: 34.48.156.181

21 of 23

Project Status

​

✅ CNCF Sandbox��✅ Incubating proposal is planned for this year

�✅ 3 public adopters

​

✅ 2 times finalist of CNCF Security Slam

​

✅ Perfect CLOMonitor score�

✅ Maintainers from Absa, Upbound, Kedify, Open Systems

​

✅ Contributors from Millennium bcp, Tetrate, D2iQ

​

​

​

​

22 of 23

Roadmap

​

✅ GatewayAPI support

​

✅ Google Cloud DNS support for automated zone delegation

​

✅ Release K8GB 1.0

​

23 of 23

Learn More and Help the Project

​

✅ Visit us at k8gb.io

​

✅ ⭐ Star us on GitHub!

​

✅ Add your organization to ADOPTERS.md

​

✅ Join k8gb Contribfest in Salt Lake City!

bit.ly/k8gb-oss24

​