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Seattle, WA
December 10–13, 2018
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Tuesday, December 11 • 11:40am - 12:15pm
The Future of Your CRDs – Evolving an API - Stefan Schimanski, Red Hat & Mehdy Bohlool, Google

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CustomResourceDefinitions (CRDs) are a cornerstone of many extensions built on-top of Kubernetes. They allow to define custom API objects and the API server will handle their life-cycle.

Most APIs start with one version, but sooner or later need to evolve while keeping compatibility with current clients/users. Kubernetes standard types do that through versioning and conversion between versions. This talk covers the corresponding evolution path for CRD based APIs.

The talk will cover:
- Why Kubernetes has multiple versions
- New feature: CRD Versioning with Conversion
- Round-Tripability Concept
- How to update schemaless API objects to schemaful
- Pruning and how to enable it
- Defaulting
- How to plan for Master Rollbacks when writing a CRD
- Storage version and storage migration
- Failure modes
- Monitoring and managing a cluster with multi-versions
- Kube builder support and Demo

Speakers
avatar for Mehdy Bohlool

Mehdy Bohlool

Software Engineer, Google
Mehdy is a Software Engineer at Google and a member of kubernetes API Machinery team. His earliest contribution is OpenAPI 2.0 support, upgraded from swagger 1.2. He is one of the contributors to CustomResourceDefinition focusing on versioning and conversion of custom resources... Read More →
avatar for Stefan Schimanski

Stefan Schimanski

Senior Software Engineer, Red Hat
Stefan is a Senior Software Developer at Red Hat working on Kubernetes and OpenShift, with a focus on API machinery, extension points and developer tools as part of Sig API Machinery. He is one of the top-3 reviewers in the project (number of reviews). Stefan is a 2nd time GoogleSummer... Read More →



Tuesday December 11, 2018 11:40am - 12:15pm
Ballroom 6A