Name: Dynamic Multi-Cluster Controllers With Controller-runtime - Marvin Beckers, Kubermatic & Stefan Schimanski, Upbound
Start: 2025-04-03T15:00:00+0100
End: 2025-04-03T15:30:00+0100

In-person
1-4 April 2025
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Thursday April 3, 2025 15:00 - 15:30 BST

Level 1 | Hall Entrance S10 | Room D

controller-runtime is the most popular SDK to write controllers for individual Kubernetes clusters. But the Kubernetes landscape is changing quickly: multi-cluster is becoming ubiquitous (e.g. through Cluster API), with clusters joining and leaving dynamically. controller-runtime has had no direct support, making writing uniform multi-cluster controllers hard and fracturing the emerging ecosystem.

This talk explores how to build controllers that reconcile resources across a dynamic fleet of Kubernetes clusters. A key change is the ability to plug in a dynamic cluster provider that registers new Kubernetes clusters from a specific source. While implementation internals are briefly discussed, focus is on a hands-on walkthrough for writing your own cluster provider, event handlers and reconciler functions.

We discuss a simplistic cluster provider implementation for “kind” clusters as an example and extrapolate from that how more complex providers could look like (e.g. for CAPI or kcp).

Speakers

Stefan Schimanski

Senior Principal Engineer, Upbound

Stefan is a Senior Principal Engineer at Upbound working on control planes, Kubernetes, kcp, and as a tech-lead in Sig API Machinery. He contributed a major part of the CRD feature set. Stefan is a 2nd time GoogleSummer of Code mentor with CNCF, loves to teach and help people to learn... Read More →

Marvin Beckers

Team Lead, Kubermatic

Marvin started out as a sysadmin, gradually turned into a software engineer and now works as an Software Engineering Team Lead at Kubermatic. He always had a passion for effective management of large server fleets, which has turned his attention to Kubernetes in 2018. He has been... Read More →

Thursday April 3, 2025 15:00 - 15:30 BST
Level 1 | Hall Entrance S10 | Room D

Emerging + Advanced

Content Experience Level Intermediate

KubeCon + CloudNativeCon Europe 2025

Stefan Schimanski

Marvin Beckers

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