StatefulSet
StatefulSets are the Kubernetes component that manages the replication and lifecycle of the Pods in the Kubernetes Cluster but specifically for Stateful applications.
Role of StatefulSet
Deployment solved our problems with the application Pod but what about the database Pod? Because if the database Pod dies, our application also would not be accessible so we need database replicas as well however we can’t replicate database using a deployment. The reason for that is because database has a state (which is its data) meaning that if we have closed a set of replicas of the database, they would all need to access the same shared data storage and there we would need some kind of mechanism that manages which Pods are currently writing to that storage or which Pods are reading from that storage. We will have to do this in order to avoid data inconsistencies.
This mechanism in addition to replicating feature is offered the Kubernetes component called StatefulSet. StatefulSet is meant specifically for applications like databases. StatefulSet just like deployment would take care of replicating the pods and scaling them up or scaling them down but making sure that database reads and writes are synchronized so that no database inconsistencies are offered. however deploying database applications using StatefulSets in Kubernetes cluster can be somewhat tedious that’s why it is also a common practice to host database applications outside of the Kubernetes cluster and just have the deployments or stateless applications that replicate and scale with no problem inside of the Kubernetes Cluster and then communicate with the external database.
Fundamental Kubernetes Components and their role in Container Orchestration
Kubernetes or K8s is an open-sourced container orchestration technology that is used for automating the manual processes of deploying, managing and scaling applications by the help of containers. Kubernetes was originally developed by engineers at Google and In 2015, it was donated to CNCF (Cloud Native Computing Foundation)
To understand Kubernetes, one must understand its basic components and its building blocks. In this article, we will be discussing the most fundamental components of Kubernetes as well as what are they used for.
Kubernetes has tons of components but most of the time we are going to be working with just a handful of them. Following is the list of all the important components of Kubernetes along with their roles in Kubernetes.
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