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Michelle Au Software Engineer, Google Kubernetes SIG-Storage Kubernetes and Container Storage Interface Update

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Agenda Background on CSI What’s New in Kubernetes? Future Getting Involved

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Background

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What is CSI? Specification for orchestrating control plane operations on file and block storage - https://github.com/container-storage-interface/spec - Create and delete - Attach and detach - Mount and unmount - Snapshot and restore Industry standard supported by multiple container orchestrators - Kubernetes - Mesos - Cloud Foundry

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Vendor Benefits Write one driver that works across multiple orchestrators Develop outside of Kubernetes core - Independent release cycle - Could be closed source

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Kubernetes Benefits Vendor code does not need to be imported into core repository Vendor code cannot crash core Kubernetes components Core maintainers don’t need to review vendor code - More time to develop core features!

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End User Benefits Large ecosystem of CSI drivers available - https://kubernetes-csi.github.io/docs/drivers.html - Over 35! Get bug fixes and new features faster without upgrading your Kubernetes cluster

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Kubernetes Integration

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apiVersion: v1 kind: PersistentVolumeClaim metadata: name: my-disk spec: storageClassName: fast-storage accessModes: - ReadWriteOnce resources: requests: storage: 100Gi Kubernetes API apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: fast-storage provisioner: csi-driver.example.com parameters: foo1: bar1 foo2: bar2

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What’s New?

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Kubernetes 1.13 Basic CSI support is GA - Dynamic provisioning, attaching, mounting - 1.0 spec added, 0.3 spec deprecated Existing alpha features - Snapshots - Raw block - Topology

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Kubernetes 1.14 Features promoted to beta - Raw block - Topology New alpha features - Resizing - Migration of in-tree plugins

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Future

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Kubernetes 1.15 and Beyond New alpha features - Ephemeral volumes - Group snapshots - Application snapshots - Volume cloning - Windows OS

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Driver Management New challenges: - Versioning - Backwards compatibility - Upgrade/downgrade Kubernetes distros can pre-package/manage qualified drivers

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Getting Involved

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Kubernetes SIG-Storage Bi-weekly meetings - https://github.com/kubernetes/community/tree/master/sig-storage Slack - #sig-storage on kubernetes.slack.com Me - Github/Slack: msau42 - Twitter: _msau42_

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First Time Contributions Improve test coverage - Raw block - Resizing - Snapshots - Topology Fixing bugs - Look for issues with “help wanted” label - https://github.com/kubernetes-csi - https://github.com/kubernetes/kubernetes - Filter by label “sig/storage”

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Questions?

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[Extra] Driver Deployment Architecture

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Deployment Architecture

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[Extra] Vendor Resources

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Writing a CSI Plugin Developer docs - https://kubernetes-csi.github.io/docs/ Hostpath sample plugin - https://github.com/kubernetes-csi/csi-driver-host-path - Not for production!

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CSI Spec Testing Validate that your CSI plugin conforms to the CSI spec - csi-sanity test suite - https://github.com/kubernetes-csi/csi-test/tree/master/pkg/sanity

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Kubernetes Testing Run Kubernetes E2E tests against any CSI driver - https://github.com/kubernetes/kubernetes/tree/master/test/e2e/ storage/external - Prereq: K8s cluster with CSI driver already installed - Future: CSI driver qualification/conformance