KubeCon + CloudNativeCon Europe 2025: Full Schedule

In-person
1-4 April 2025
Learn More and Register to Attend

The Sched app allows you to build your schedule but is not a substitute for your event registration. You must be registered for KubeCon + CloudNativeCon Europe 2025 to participate in the sessions. If you have not registered but would like to join us, please go to the event registration page to purchase a registration.

Please note: This schedule is automatically displayed in British Summer Time (BST) (UTC +1). To see the schedule in your preferred timezone, please select from the drop-down menu to the right, above "Filter by Date." The schedule is subject to change and session seating is available on a first-come, first-served basis.

16:45 BST

⚡Lightning Talk: High Availability With '503: Unavailable' - Robert-Jan Huijsman, Reboot

Thursday April 3, 2025 16:45 - 16:50 BST

Level 0 | ICC Auditorium

Traditionally, we think "high availability" ("HA") means "very rarely responds '503: Unavailable'". Our applications and platforms have a lot of code to support that. For example, Knative contains a "Queue-Proxy" that holds requests while an application is scaling up - so that it doesn't have to respond "503: Unavailable" while the application is unavailable!

However, users don’t care about HTTP return codes - they care when their request is answered. Can we deliver a great user experience without the complexity of buffering in-flight requests?

We recently took a different approach to HA: an application (built using Envoy, Istio, and gRPC) that doesn't hesitate to return "503: Unavailable" and expects clients to retry. We found this approach reduces complexity drastically, while maintaining all the metrics our users care about. In this talk we'll discuss which applications might see benefits from this approach, the pitfalls we had to avoid, and whether we're still "Highly Available".

Speakers

Robert-Jan Huijsman

Founding Engineer, Reboot

My passion is building systems - especially computer systems and the human systems (organizations) that build them. I studied computer science in Amsterdam, worked at Google (Spanner, Firebase) in Silicon Valley, ran my own intercontinental startup (Tracis), and am now the entire... Read More →

Thursday April 3, 2025 16:45 - 16:50 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Application Development

Content Experience Level Any

16:50 BST

⚡Lightning Talk: Kueue: Save Some QPS for the Rest of Us! How To Manage 100k Updates Per Second - Patryk Bundyra, Google

Thursday April 3, 2025 16:50 - 16:55 BST

Level 0 | ICC Auditorium

What if you had to update 100,000 objects every second? How do we avoid choking up the API server with such a load? Is directly modifying etcd objects even a viable option? In Kueue, we asked those questions a lot, and honestly, using standard CustomResourceDefinitions alone couldn’t keep up with the demands of this scale. In this session we will showcase how we combined the best of both worlds: CRDs and the good old K8s API Aggregation Layer to handle the dynamic positioning of up to 100,000 jobs in the queue.

Attendees will also gain valuable insights into system design decisions when dealing with such a scale and practical lessons for addressing similar challenges. We will delve into the pros and cons of both CRDs and the Aggregation Layer, providing clear guidance on when and why to use each. Finally, attendees will see how the K8s API Aggregation Layer extension works in practice and receive hands-on knowledge on choosing the right tool for the job.

Speakers

Patryk Bundyra

Software Engineer, Google

Patryk is a Software Engineer at Google working on Kueue, an open-source SIG project. Member of the Kubernetes Batch Working Group, always willing to collaborate and share his knowledge.

Thursday April 3, 2025 16:50 - 16:55 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Platform Engineering

Content Experience Level Any

16:55 BST

⚡Lightning Talk: Observability Diet: Your 5-Step Plan To Trim the Data Fat - Pranay Prateek, SigNoz

Thursday April 3, 2025 16:55 - 17:00 BST

Level 0 | ICC Auditorium

Many organizations drown in terabytes of telemetry data but often use only 20% of it.

In this lightning talk, we'll sprint through battle-tested strategies in OpenTelemetry to trim your observability costs without compromising visibility. From intelligent sampling to SDK optimization, learn how to implement a lean observability practice that focuses on signal over noise.

Key Takeaways:
- Sampling : Tail based sampling, head based sampling for traces, probabilistic sampler processor for logs
- Using processors in the Otel collector with granular filtering/dropping of irrelevant attributes - to control volume going out of collector
- Reduce the volumes at the SDKs by controlling what attributes are sent - e.g.control what http.headers are sent
- Visibility on cardinality in time series (and suggestions on what attributes to drop)
- Use `Views` in SDKs to customise aggregation or which attributed are reported in metrics
- Using granular retention settings to reduce observability costs

Speakers

Pranay Prateek

Maintainer, SigNoz

Pranay is one of the maintainers at SigNoz, an open source APM. He loves working on open source and observability, and has deep interest in philosophy esp. around Existentialism He is one of the organisers of OpenTelemetry APAC discussion group meetings & has been speaker in events... Read More →

Thursday April 3, 2025 16:55 - 17:00 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Application Development

Content Experience Level Beginner

17:00 BST

⚡Lightning Talk: Resource Roulette: Winning the Kubernetes Allocation Game - Daniele Polencic, Learnk8s

Thursday April 3, 2025 17:00 - 17:05 BST

Level 0 | ICC Auditorium

In this lightning talk, we'll challenge the conventional wisdom of setting static requests and limits for Kubernetes workloads. As applications evolve and usage patterns fluctuate, predefined resource allocations become obsolete, leading to either resource waste or performance bottlenecks.

In just 5 minutes, you'll learn:

- Quick techniques to identify resource misconfigurations
- Simple tricks for implementing adaptive resource management
- Easy-to-apply strategies for balancing cost and performance

Speakers

Daniele Polencic

Instructor, Learnk8s

Daniele teaches containers and Kubernetes at Learnk8s. Daniele is a certified Kubernetes administrator by the Linux Foundation. In the last decade, Daniele trained developers for companies in the e-commerce, finance and public sector.

Thursday April 3, 2025 17:00 - 17:05 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Application Development

Content Experience Level Any

17:05 BST

⚡Lightning Talk: Rust Here, Rust There, Rust Everywhere! How a Crab Conquers the Cloud Native Landscape. - Sascha Grunert, Red Hat

Thursday April 3, 2025 17:05 - 17:10 BST

Level 0 | ICC Auditorium

The Rust ecosystem is growing slow and steady into the cloud native landscape. While some projects like youki completely set on the memory safe programming language, do others like CRI-O try to integrate it only partially into their projects. The overall goal of using Rust over anything else is to achieve a more performant, efficient and reliable software.

In this lightning talk, Sascha will outline the benefits and drawbacks of using Rust over the more commonly used Go language in the cloud native space. It will provide funky examples of how to switch between those languages, what are good and bad practices and how to deliver a Rust application to end users. The talk will provide an overview about which parts of the cloud native landscape are already Rusty and what we can expect in the upcoming years.

Join this lightning talk for a quick and compact cloud native comparison between Rust’s Ferris the crab and Go’s Gopher!

Speakers

Sascha Grunert

Principal Software Engineer, Red Hat

Sascha is a Principle Software Engineer at Red Hat, where he works on many different container related open-source projects like Kubernetes. He joined the open-source community in November 2018. Sascha's passions include contributing to open source, as well as giving talks and evangelizing... Read More →

Thursday April 3, 2025 17:05 - 17:10 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Cloud Native Experience

Content Experience Level Beginner

17:10 BST

⚡Lightning Talk: Scaling To the Stars: Simulating Massive Clusters With KWOK - Soumya Balakrishnan, NVIDIA

Thursday April 3, 2025 17:10 - 17:15 BST

Level 0 | ICC Auditorium

At NVIDIA, we operate a large fleet of GPU Clusters that run Gaming and AI/ML workloads. As we expand, ensuring that we scale safely and efficiently becomes a critical challenge. Enter KWOK(Kubernetes Without Kubelet), our secret weapon for stress-testing new features before they hit production.
This talk will dive into how we integrate KWOK into our development pipeline, showcasing how it's helped us maintain stability while rapidly innovating.
1. Identifying resource utilization boundaries: Demonstrate how KWOK has helped us evaluate the resource limits that need to be set on service pods so they can operate within safe boundaries.
2. Code optimization insights: Share examples of how KWOK has helped optimize our automation tools, significantly reducing their memory footprint.
3. Performance testing at scale: Illustrate how KWOK enables us to simulate large-scale environments, allowing us to identify potential bottlenecks and optimize system performance before production deployment.

Speakers

Soumya Balakrishnan

Senior Software Engineer, NVIDIA

Soumya is a Senior DevOps Engineer at NVIDIA, specializing in cloud infrastructure and Kubernetes technologies.

Thursday April 3, 2025 17:10 - 17:15 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Platform Engineering

Content Experience Level Intermediate

17:15 BST

⚡Lightning Talk: Scheduling Success: Precision Updates for Continuous Manufacturing Operations - Raul - Mihail Galescu, Bosch Connected Industry

Thursday April 3, 2025 17:15 - 17:20 BST

Level 0 | ICC Auditorium

Cloud-native technologies are gaining traction in manufacturing, as the industry strives for zero-downtime deployments in production systems. However, many plants rely on legacy software that doesn’t integrate smoothly with cloud-native environments. Even when containerized, these components often fail to support seamless request redirection between replicas, causing disruptions during cluster or node updates. These disruptions require precise scheduling around plant shift plans. This lightning talk will explain why maintenance windows can still be effective and how Bosch Connected Industry addresses the limitations of public cloud providers' update controls. You’ll learn a simple yet effective approach to managing cluster updates and node image promotions in production-critical environments.

Speakers

Raul Galescu

Junior DevOps Engineer, Bosch Connected Industry

Raul is a Junior DevOps Engineer at Bosch Connected Industry, specializing in optimizing cloud-native solutions. Prior to this role, he worked as a Junior System Administrator at the West University of Timisoara and provided IT solutions to public institutions at a local company in... Read More →

Thursday April 3, 2025 17:15 - 17:20 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Platform Engineering

Content Experience Level Intermediate

17:20 BST

⚡Lightning Talk: Solving Real-World Edge Challenges With K0s, NATS, and Raspberry Pi Clusters - Prashant Ramhit, Mirantis, Inc.

Thursday April 3, 2025 17:20 - 17:25 BST

Level 0 | ICC Auditorium

Monitoring sea algae proliferation and coral growth in real time may seem daunting, but with the right tools, it becomes an exciting edge computing project. Using k0s, the lightweight CNCF-certified Kubernetes distribution, and NATS, the connective technology for edge computing, this project solved the challenges of data collection and processing in a distributed Raspberry Pi cluster.

Leveraging k0s’s minimal resource footprint and automated scaling, paired with NATS’s efficient messaging capabilities, the project enabled real-time sensor data collection and transmission under resource-constrained conditions. Dynamically bootstrapped Raspberry Pi clusters processed data locally while integrating with a central control plane.

Learn about dynamically bootstrapping Raspberry Pi clusters with k0s, managing distributed edge clusters, deploying NATS for scalable messaging, and scaling workloads based on environmental changes. See how k0s and NATS efficiently tackle real-world challenges.

Speakers

Prashant Ramhit

Snr. DevOps & QA, Mirantis, Inc.

Prashant is a skilled technologist with over two decades of experience, starting as a Linux System Administrator in the late 1990s. Progressing into SRE, DevOps, and Platform Engineering, he developed expertise in cloud-native systems and Golang development. Having worked at the BBC... Read More →

Thursday April 3, 2025 17:20 - 17:25 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Operations + Performance

Content Experience Level Beginner

17:25 BST

⚡Lightning Talk: There Is a New Volume Type in Town! - Mario Loriedo, Red Hat

Thursday April 3, 2025 17:25 - 17:30 BST

Level 0 | ICC Auditorium

Volumes of type “image” open new scenarios and ways to use containers. The primary use case is AI workloads, the main drive for KEP-4639, which introduced them. However, these new volumes can have a broader impact. They allow the composition of different OCI images to augment a workload’s capabilities. Think of it as a container sidecar, but without the container’s isolation and with volumes composability.

This lightning talk discusses the volumes of type “image” and their different use cases, from AI to workload troubleshooting.

Speakers

Mario Loriedo

Senior Principal Software Engineer, Red Hat

Mario is a Senior Principal Software Engineer at Red Hat. He works on Podman and on container-based developer tools. He has been a CNCF Ambassador and the tech lead of the Eclipse Che project. He has co-created the Devfile (a CNCF Sandbox Project). He has been a speaker at conferences... Read More →

Thursday April 3, 2025 17:25 - 17:30 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Cloud Native Experience

Content Experience Level Beginner

17:30 BST

⚡Lightning Talk: Extending Envoy With WebAssembly - Yuki Ito, newmo, Inc.

Thursday April 3, 2025 17:30 - 17:35 BST

Level 0 | ICC Auditorium

As a Cloud Native network proxy, Envoy has been widely used as a sidecar for Service Mesh, API Gateway, and many other cases. To deal with many custom requirements, Envoy has some extension points, one of which is the WebAssembly plugin feature.
In this Lightning Talk, the speaker, who is writing some WebAssembly plugins for Envoy and using them in a production environment, introduces the basics of the WebAssembly plugin for Envoy and explains how to write it using SDK by sharing some real-world examples.

Speakers

Yuki Ito

Software Architect, newmo, Inc.

Yuki is a software architect who promotes Platform Engineering, including API Platform, Cloud Infrastructure, CI/CD, and so on, for newmo, Inc. He also acts as a Google Cloud Champion Innovator in the fields of Serverless App Development and Modern Architecture.

Thursday April 3, 2025 17:30 - 17:35 BST
Level 0 | ICC Auditorium

⚡ Lightning Talks, Application Development

Content Experience Level Any