CozySummit Virtual 2025

As a cloud provider, we spend time to find a solution to make a multi-AZ IaaS solution. Our goals was to find the best orchestrator, the very high-availability system, and give the full secure system to our customers. I'll talk about our journey with different solutions and then Cozystack.

Speaker: Matthieu Robin CEO by Day, DevOps Evangelist Always Company: Hidora

Passionate entrepreneur & CEO of Hidora, leading cloud/DevOps adoption. Founder of DevOps Geneva Meetup & DevOpsDays Geneva. Professor at HEG teaching Service Industrialization. Volunteer firefighter committed to community service. Dedicated to innovation, education & fostering DevOps collaboration.

Running CozyStack in a home lab can be equal parts fun and furnace — especially when unused workloads turn into a very real space heater. This talk explores the practical tradeoffs involved in running CozyStack at home, some strategies for shifting services to the cloud or serverless, and powering down X86 nodes for ARM64 to save energy and cut down on waste heat - while still maintaining a high standard of availability and measuring the performance on the CozyStack platform.

We'll look at ways to measure the actual energy cost of a CozyStack cluster, strategies for moving or pinning workloads by architecture with node selectors, and trade-offs of relying on external storage to keep the footprint lean. Along the way, I'll give a demo of SpinKube, built on top of custom Talos images (with a spin runtimeclass extension), showing how the developer experience for CozyStack enables deep customization and hands-on experimentation with Talos Linux.

The focus isn't on one right setup, but on how CozyStack makes it possible to explore, measure, and balance cost, energy, and reliability in any environment - whether in the basement, the cloud, or somewhere in between.

Speaker: Kingdon Barrett Flux Maintainer, DevOps Engineer Company: Navteca, LLC.

Kingdon Barrett is a Flux maintainer and a DevOps Engineer at Navteca, presently working on a project called Science Cloud for the Goddard Space Flight Center and Science Mission Directorate at NASA. He is a Ruby/Go developer. Find Kingdon at Flux Bug Scrub!

Flexibility is what every platform promises. Extensibility is what developers actually need. But making a system both adaptable and reliable is one of the hardest problems in engineering.

At Cozystack, we face this daily. As an open-source, community-driven alternative to traditional cloud platforms, our users deploy in wildly different environments. Meeting their needs means more than writing operators — it requires a modular framework where APIs stay stable, even as the system evolves.

In this talk, I’ll share the engineering trade-offs behind Cozystack’s newest features: how we design for pluggability without breaking contracts, what worked (and what didn’t) when balancing flexibility with simplicity, and how these lessons can apply to any extensible platform. My aim is to show not just what we built, but the principles that helped us turn ambition into working software.

Speaker: Timofei Larkin Head of Development Company: Ænix

Tim leads development at Ænix. Before Ænix Tim spent several years as a cloud/infra engineer at various enterprises

I started my cloud journey like many beginners: with AWS. It was exciting at first, but very quickly I realized how dependent I had become on a single provider and how costly and complex it could get. That made me curious about alternatives.

In this talk, I’ll share my perspective as a newcomer exploring Cozystack, an open-source way to build your own private cloud. I’ll explain how I compared my “AWS-first” mindset to what Cozystack offers, what I learned along the way, and why platforms like this matter for digital sovereignty and avoiding lock-in.

Speaker: Kirti Goyal Cloud Native & Open Source Contributor

Kirti Goyal is an open source contributor with the CNCF community, focusing on Meshery. She is passionate about simplifying cloud-native technologies and creating smoother pathways for newcomers to start contributing. Through her work, Kirti advocates for visual, collaborative approaches to infrastructure management and encourages others especially students and early-career engineers to find their place in open source.

This talk focuses on SeaweedFS’s S3 API enhancements released mid‑2025, which covers server-side encryption modes (SSE‑S3, SSE‑KMS, SSE‑C), advanced IAM, conditional reads/writes for bandwidth savings and cache safety, and data governance features including Versioning and Object Lock/Retention. We’ll close with future development plans.

Speaker: Chris Lu SeaweedFS Creator Company: SeaweedFS

Chris Lu is the creator and lead maintainer of SeaweedFS, an open‑source distributed object store and file system. At Roblox he focuses on building secure, high‑performance storage systems. At Uber, he built ML infrastructure for risk, created a graph database, and developed streaming feature computation framework. At Facebook, he worked on optimizing exabyte‑scale data to improve performance and locality.

This session will offer a deep dive into the storage infrastructure of Cozystack. A core component of any private cloud, the storage layer needs to ensure availability while not compromising on the performance offered by the hardware. The session will focus on the open-source technologies that power the storage infrastructure: LINSTOR and DRBD.

After a short theoretical introduction, we will focus on demonstrating the Cozystack storage layer in action: creating replicated volumes, seeing it deal with node failures and checking out how it integrates with the Virtualization and Backup solutions.

Speaker: Moritz Wanzenböck LINBIT, Kubernetes Integration Engineer Company: LINBIT

I am interested in the inner workings of cloud infrastructure and automation. After years of working with storage solutions as a user, I switched sides in 2020 to work on software defined storage solutions at LINBIT. I am a maintainer of the Piraeus project, always on the lookout to automate and containerize more features.