Open Source Summit Europe 2025: Full Schedule

25-27, August 2025
Amsterdam, Netherlands
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Note: The schedule is subject to change.

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IMPORTANT NOTE: Timing of sessions and room locations are subject to change.

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11:00 CEST

VM-Friendly Networking on Kubernetes: Customizable Networks, Live Migration, and Best Practices - Surya Seetharaman & Miguel Barroso, Red Hat

Tuesday August 26, 2025 11:00 - 11:40 CEST

G001-002

Bringing virtual machines into Kubernetes introduces unique networking challenges, especially in public cloud environments. Traditional Kubernetes Networking plugins, designed for ephemeral containers, fall short in supporting virtualization-specific needs like stable IPs during live migrations and network segmentation. This talk explores how the CNCF projects OVN-Kubernetes and KubeVirt work together to provide networking that supports the needs of virtual machines on Kubernetes.

OVN-Kubernetes is a robust network plugin for Kubernetes clusters. KubeVirt is a virtualization plugin that manages the lifecycles of VMs on Kubernetes. In this session, we will introduce these projects and walk you through:

- How to set up multiple, customizable networks in Kubernetes

- How to connect your applications and VMs to separate, isolated networks

- How to perform live VM migration across Layer 2 networks without downtime

- Best practices for configuring your networking setup based on your platform—whether you're running in the cloud or on-prem

Join us to learn how to build flexible, VM-friendly networking on Kubernetes.

Speakers

Miguel Duarte Barroso

Principal Software Engineer, Red Hat

Miguel is a Principal Software Engineer for OpenShift Virtualization at Red Hat.

Surya Seetharaman

Principal Software Engineer, Red Hat

Surya is an Open Source advocate and contributor, active in the Kubernetes SIG-Network working group. She is working as a Principal Software Engineer at Red Hat in the OpenShift Networking team. Her areas of interest include Cloud Infrastructure and Networked Services and Systems... Read More →

Tuesday August 26, 2025 11:00 - 11:40 CEST
G001-002

Cloud & Containers

Audience Experience Level Advanced

11:55 CEST

Defense in Depth: High Speed Cloud Native With Soft- and Hardware Protected Functions - Ralph Squillace, Microsoft

Tuesday August 26, 2025 11:55 - 12:35 CEST

G001-002

GitHub is one of the largest (if not the largest) open-source code repositories in the world, but its growth creates technical challenges: How can it continue to scale up activities at its rate of growth? How can it protect activities from each other if one uses code with a malicious attack in it?

This talk describes a fun experiment using the CNCF project Hyperlight and WebAssembly (wasm) components to investigate radical scaling of GitHub events using WebAssembly Components to both handle heavy event load on smaller, less costly VMs but at the same time use Hyperlight to provide hardware protection to each individual function.

WebAssembly is a form of “cloud native binary” that runs on almost any operating system and architecture. The emerging wasm component model is a series of standards that enables any language to make use of components written in any other language while radically scoping in the capabilities of a function, giving it only the permissions to execute that the host deems necessary.

When combined with the Hyperlight project, it becomes possible to use security-in-depth features to scale compute far more with far less risk.

Speakers

Ralph Squillace

Principal Product Manager, Microsoft

Professionally trained in history; don't tell him, because he's professionally suffered in distributed applications for the past 20 years or so. A veteran of OSS wars inside the megacorp, he's thrived as the world changed. He runs Ubuntu at work, except for those times when he does... Read More →

Tuesday August 26, 2025 11:55 - 12:35 CEST
G001-002

Cloud & Containers

Audience Experience Level Any

14:10 CEST

No Internet - No Problem? Air-Gapped Kubernetes on Bare Metal - Christian Bendieck & Carolin Dohmen, BWI GmbH

Tuesday August 26, 2025 14:10 - 14:50 CEST

G001-002

What do you do when connectivity isn’t just flaky – it’s nonexistent? In this talk, we’ll take you through our experience deploying fully automated, air-gapped Kubernetes clusters on bare metal servers – without internet access, without a pre-existing registry, and minimal reliance on datacenter services such as NTP.

As the IT provider for the German Armed Forces, we operate in environments where isolation isn't optional – it's mandatory. Whether due to strict security requirements or the literal ocean between hardware and surface.

At the heart of our setup is a purpose built origin node based on NixOS – which provides all necessary external services to bootstrap the cluster leveraging Talos OS.

This session will cover the technical architecture, the automation stack, and some of the challenges we faced, including:

- Bootstrapping from air-gapped nothingness

- Pitfalls and amazement of Nix and NixOS

- Talos quirks such as image caching limitations

- The joys of automating server setup by accessing BMCs with the Redfish API

- Considerations of NeoNephos projects for further development

You'll leave with practical insights for spinning up fully disconnected Kubernetes clusters.

Speakers

Christian Bendieck

Cloud Engineer, BWI GmbH

I am a Cloud Engineer at BWI with 10+ years of experience in automating IT infrastructures. Currently, I develop private cloud environments and drive automation, including CI/CD pipelines and Kubernetes platform creation. Previously, I worked as a Technical Cloud & Automation Consultant... Read More →

Carolin Dohmen

Cloud Engineer, BWI GmbH

I am a Cloud Engineer at BWI GmbH, working on building a private cloud for the German Armed Forces.

Tuesday August 26, 2025 14:10 - 14:50 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

15:05 CEST

Declarative Device Virtualization: Orchestrating GPUs & Hardware in Cloud Native Environments - Samrat Priyadarshi & Anmol Krishan Sachdeva, Google

Tuesday August 26, 2025 15:05 - 15:45 CEST

G001-002

This session explores how declarative pipelines revolutionize GPU and hardware virtualization within Kubernetes. We'll address the challenges of managing specialized hardware resources in cloud-native applications and demonstrate how to orchestrate virtualized devices with ease. Attendees will learn to define device configurations using YAML, deploy virtualized GPUs, FPGAs, and other accelerators into Kubernetes clusters, and automate complex hardware interactions. We'll cover practical examples of using declarative pipelines for AI/ML workloads, edge computing, and high-performance computing (HPC). This talk empowers developers and operators to unlock the full potential of hardware resources, building scalable, resilient, and adaptable device virtualization solutions, specifically focusing on GPU management and optimization.

Speakers

Samrat Priyadarshi

Cloud Engineer, Google

Samrat is a Cloud Engineer at Google with 8 years of experience in Cloud Computing focussing mainly on Kubernetes and related landscapes. He has delivered multiple international and national conferences including Open Source Summit, Japan, 2024. He has a Youtube channel with more... Read More →

Anmol Krishan Sachdeva

Sr. Hybrid Cloud Architect, Google

Anmol is a seasoned International Tech Speaker (delivered 75+ talks), a Distinguished Guest Lecturer, an active conference organizer, and has published several notable papers. He works at Google and focuses on Emerging Technologies.

Tuesday August 26, 2025 15:05 - 15:45 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

16:20 CEST

Bridging Worlds: Implementing OpenStack Support for NixOS - Stefan Kober, Cyberus Technology GmbH

Tuesday August 26, 2025 16:20 - 17:00 CEST

G001-002

This talk presents our approach to integrating OpenStack cloud infrastructure with NixOS, addressing a significant gap in development workflows for OpenStack Nova.

Our primary motivation was to simplify testing and development processes by leveraging NixOS' declarative and reproducible environment capabilities. We'll demonstrate how our implementation uses NixOS modules to create deterministic OpenStack deployments where components - particularly the Nova compute and the Neutron network service - are defined as NixOS modules within the Nix expression language. This approach eliminates configuration drift during development cycles and enables developers to quickly reproduce specific environments.

We'll share practical insights from our implementation journey, highlighting how this integration streamlines OpenStack development workflows through consistent test environments and easy service configuration manipulation. We'll discuss the qualitative improvements in developer experience and outline future directions for expanding NixOS support across the OpenStack ecosystem.

Speakers

Stefan Kober

Software Engineer, Cyberus Technology GmbH

Stefan is a software developer from Germany with a background in systems programming and virtualization. He studied computer science at the BTU Cottbus and joined Cyberus Technology after finishing his master thesis.

Tuesday August 26, 2025 16:20 - 17:00 CEST
G001-002

Cloud & Containers

Audience Experience Level Intermediate