Understanding the concept of persistent volumes
We will start by providing a quick introduction to the foundational storage concepts in Kubernetes and how Cloud Pak for Data leverages storage. Typical containers are stateless, which means that any files they create or any changes they make will be ephemeral; upon restarting the container, these changes would not be restored. Also, in-container files would be created in a temporary location on the host, which can cause contention with other, similar consumers of that location. In Kubernetes, the concept of volumes [1] enables the persistence of directory files that are needed for stateful containers. Such volumes are mounted in a Kubernetes Pod and, depending on the access mode associated with that volume, the same directory contents can be shared with other Pods running concurrently within that Kubernetes namespace.
In this section, you will learn what it means to provision entities known as persistent volumes, which provide storage...
