Storage in Kubernetes

• Storage and stateful workloads are harder in all systems

• Containers make it both harder and easier than before

• StatefulSets is a new resource type, making Pods more sticky

• Avoid stateful deployments for first few deployments until you're good at the basics

• Use Database-as-a-Service whenever you can

• Creating and connecting volumes: 2 types

  • Volumes

    • Tied to a lifecycle of a Pod

    • All containers in a single pod can share them

  • PersistentVolumes / PersistentVolumeClaims

    • Created at a cluster level, outlives a Pod

    • Separates a storage config from Pod using it

    • Multiple Pods can share them

• CSI (Container Storage Interface) plugins are the new way to connect to storage