ARO Public cluster & storage 101

Introduction

This is an introduction to play with Storage integration in ARO : OCS (Ceph) vs Azure Disk + File + Blob, Storage types (GRS, etc)

Disclaimer

The features described in this workshop might be not yet production-ready, we enable preview-features for the purpose of learning.

PV with CSI in ARO

Term	Definition
Container Storage Interface (CSI)	A specification attempting to establish an industry standard interface that Container Orchestration Systems (COs) can use to expose arbitrary storage systems to their containerized workloads.
in-tree	Code that exists in the core Kubernetes repository.
out-of-tree	Code that exists somewhere outside the core Kubernetes repository.
CSI Volume Plugin	A new, in-tree volume plugin that acts as an adapter and enables out-of-tree, third-party CSI volume drivers to be used in Kubernetes.
CSI Volume Driver	An out-of-tree CSI compatible implementation of a volume plugin that can be used in Kubernetes through the Kubernetes CSI Volume Plugin.

ARO does not ship with any CSI drivers, it uses Kubernetes PV framework aka in-tree plugin. These volume plugins were “in-tree” meaning their code was part of the core k8s code and shipped with the core Kubernetes binaries.
ARO supports :
- kubernetes.io/azure-disk kubernetes.io/azure-file & provisioners
- CSI Drivers, FlexVol, hostPath
- Red Hat OpenShift Container Storage, a provider of agnostic persistent storage SDS using CEPH

CSI Migration is in Beta (requires k8s v1.17). Timeline/status : GA Target v1.19 When enabled, CSI Migration feature shims all plugin operations from the existing in-tree plugin

for azureDisk to the disk.csi.azure.com CSI driver
for azureFile to the file.csi.azure.com CSI driver

ezYakaEagle442/aro-pub-storage

ARO Public cluster & storage 101

Introduction

Disclaimer

PV with CSI in ARO

ToC