What is kubernetes controller manager2/16/2023 ![]() The controller is in charge of providing as many Pods as desired/stated in the spec by creating or deleting them by monitoring the cluster’s Pod resources. The resource definition has a number of replicas defined in the resource’s spec. The usual examples are the Kubernetes ReplicaSet, StatefulSet, and DaemonSet controllers. So in the Kubernetes world, a controller will basically monitor and measure the cluster resources state to adjust those resources that diverge from the desired state.Īccording to this definition, anything that automates a task that brings the cluster’s overall status to a defined desired state falls into this category. It consists of all the physical components and control functions necessary to automatically adjust the value of a measured process variable (PV) to equal the value of a desired set-point (SP). ![]() Kubernetes controller documentation starts with a short control loop definition, this is what the Wikipedia entry says: A control loop is the fundamental building block of industrial control systems. In this post, I’ll try to summarize what each of these patterns involves and list some examples. There are lots of conventions and unclear documentation about both terms and I think many may be confused too. During the past few weeks, I’ve been trying to understand what a Kubernetes Operator is and what makes it different from a Kubernetes Controller. ![]()
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