![]() ![]() These endpoints can be accessed using standard HTTP requests and are used by various Kubernetes components, such as the command-line tool kubectl and other Kubernetes controllers.Ĭommunication: The API server acts as the central communication point for all the other components in the control plane. It also enforces security policies to ensure that resources are only accessed and modified by authorized entities.ĪPI endpoints: The API server exposes a set of RESTful API endpoints that can be used to interact with the cluster. It is responsible for managing the state of the cluster and processing all incoming requests for cluster resources.Īuthentication and authorization: The API server provides authentication and authorization services to ensure that only authorized users and applications can access and modify the cluster resources. It provides a standard and secure way to interact with the cluster and ensures that all operations are authenticated and authorized.Ĭluster management: The API server is the central hub for all cluster management operations. The API server’s primary function is to provide a RESTful interface for managing and controlling the cluster. It runs on the master nodes in a Kubernetes cluster. The API server is one of the core components of the Kubernetes control plane. They are usually some of the most secure nodes in the cluster, as they contain the API server and etcd, both of which store sensitive configuration data and state information. The master nodes are typically the most powerful nodes in the cluster, with high processing power and memory resources. It includes several controllers that monitor activity and take action to ensure that the desired state of the cluster is maintained. It evaluates resource requirements and available resources to determine the optimal node for a workload to run on.Ĭontroller manager: This component is responsible for managing and monitoring the state of the cluster. Scheduler: This component is responsible for scheduling workloads on the worker nodes in the cluster. It provides a REST API that clients can use to interact with the cluster, and it manages the overall state of the cluster.Įtcd: This component is a distributed key-value store that stores the state of the cluster, including configuration data and metadata. The master nodes typically consists of the following components:ĪPI server: This component is the primary management component of the cluster. You typically have more than one master node in order to provide high availability. ![]() They are responsible for managing and coordinating all the nodes in the cluster, scheduling and deploying applications and monitoring the state of the cluster. The master nodes run the central control plane that manages the entire cluster. The control plane's components make global decisions about the cluster (for example, scheduling) and also detect and respond to cluster events (for example, starting up a new pod when a deployment's replicas field is unsatisfied).Īn overview of basic Kubernetes architecture, highlighting the Kubernetes control plane and its relationship to the data plane, pods and other structures. The control plane is a collection of processes and components that are responsible for the overall management and coordination of a cluster. As you read this blog, you will build a deeper understanding of the Kubernetes control plane, which constitutes the central nervous system of a Kubernetes cluster. In Part 3, we go deeper into the data plane components and related concepts. ![]() Part 1 describes the reasons for choosing Kubernetes and will help you decide if your situation is suitable for Kubernetes use. This blog on Kubernetes control plane components is the second in a series of three that teaches the foundations of Kubernetes architecture. Part 2: Kubernetes Control Plane Components This blog series covers the following topics: ![]() After reading these blogs, you’ll have a much deeper understanding of the main reasons for choosing Kubernetes as well as the main components that are involved when you start running applications on Kubernetes. This Kubernetes Architecture series covers the main components used in Kubernetes and provides an introduction to Kubernetes architecture. ![]()
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