StatefulSets
StatefulSets are a Kubernetes resource used to manage stateful applications such as databases. They are similar to Deployments but are designed to handle stateful workloads that require persistent storage and unique network identifiers.
A StatefulSet manages Pods that contain stateful applications (applications that must keep track of data for other applications or other user sessions). The Pods in a StatefulSet have a sticky, unique identity that persists across rescheduling. This allows each Pod to maintain its state when restarted or rescheduled onto a new node. This makes StatefulSets ideal for stateful apps such as databases that require data persistence. Deployments, on the other hand, are designed for stateless workloads and provide identical Pods with no persistent storage. Thus, they are better for stateless web apps.
StatefulSets operate by creating PersistentVolumes (which will be covered later in this chapter) for each Pod to mount. This ensures data...
