# Storage --- ## Volumes --- ### On-disk files in a container are "ephemeral" --- ### Problems 1. Losing files when a container chrashes 2. Share file between containers running together in a `Pod` --- ### What about Docker Volums? - A directory on disk or in another container - Limited volume drivers --- ## Kubernetes Volumes --- ### Kubernetes Volumes - Presistent Volumes - Ephemeral Volumes --- ## Presistent Volumes --- ### Presistent Volumes Resources - PersistentVolume - PersistentVolumeClaim --- ### PresistentVolume(PV) - A piece of storage - Provisioned by an administrator - Dynamically provisioned using `Storage Classes` --- ### Storage Classes Administrators to describe the "classes" of storage they offer --- ### PresistentVolumeClaim(PVC) - A request of storage by a user - Specify size & [access modes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes) ---  https://phoenixnap.com/kb/wp-content/uploads/2021/04/graphic-of-persistent-volume-bond.png --- ### Lifecycle of a volume & claim - Provisoning - Binding - Using - Storage Object in Use Protection - Reclaiming - ... --- ### Type of Presistent Volumes  https://kubernetes.io/docs/concepts/storage/persistent-volumes/#types-of-persistent-volumes --- ## vSphere Volume --- ### vSphere Volume - vSphere Cloud Provider Interface - vSphere Cloud Storage Interface --- ### Cloud Provider Interface --- The Cloud Provider Interface (CPI) replaces the Kubernetes Controller Manager for only the cloud specific control loops ---  https://github.com/kubernetes/cloud-provider-vsphere/raw/master/docs/images/out-of-tree-arch.png --- ### vSphere Cloud Provider Interface --- The out-of-tree CPI integration connects to vCenter Server and maps information about your infrastructure, such as VMs, disks, and so on, back to the Kubernetes API ---  https://github.com/kubernetes/cloud-provider-vsphere/raw/master/docs/images/vsphere-out-of-tree-architecture.png --- ### Cloud Native Storage in VMware ---  https://raw.githubusercontent.com/kubernetes-sigs/vsphere-csi-driver/master/docs/images/CNS-Architecture.png --- ### vSphere Cloud Storage Interface Driver --- ### vSphere CSI Driver - Controller` - Node --- ### vSphere CSI Controller - Managing the lifecycle of vSphere volume - Volume provisioning, attaching and detaching the volume to VMs - Mounting, formatting and unmounting volumes from the pod within the node VM --- ### vSphere CSI Node - Formatting, mounting the volumes to nodes - Using bind mounts for the volumes inside the pod --- ## Demo --- ### Thank you!