What types of storage are used in Kubernetes?

The following types of storage are used in Kubernetes:

• etcd — a distributed key-value store that serves as the primary source of truth for cluster configuration and state.
• Persistent Volumes (PV) — an abstraction for permanent data storage that can be used by pods.
• ConfigMaps and Secrets — special objects for storing configuration data and sensitive information.

Thus, etcd is responsible for the internal state of the cluster, while PV, ConfigMaps, and Secrets are responsible for storing data and configurations used by applications within the cluster.