Other instances will see an active leader and wait for that entry to expire (for example, when a node is unresponsive). One instance of the kube-controller-manager will create an entry in the Kubernetes endpoints and updates that entry in a configured interval. The Kubernetes controller manager uses leader election using an endpoint in Kubernetes. This means that if a node becomes unreachable, the local NGINX proxy on the node will forward the request to another Kubernetes API server in the list. Each node with the role controlplane will be added to the NGINX proxy on the nodes with components that need to access the Kubernetes API server. The Kubernetes API server ( kube-apiserver) scales horizontally. Note: Nodes with the controlplane role are shown as Unschedulable in the UI, meaning no pods will be scheduled to these nodes by default. See Kubernetes: Master Components for a detailed list of components. Nodes with the controlplane role run the Kubernetes master components (excluding etcd, as it's a separate role). Note: Nodes with the etcd role are shown as Unschedulable in the UI, meaning no pods will be scheduled to these nodes by default. Nodes with the etcd role run etcd, which is a consistent and highly available key value store used as Kubernetes’ backing store for all cluster data. Colors are used purely for visual aid etcd Lines show the traffic flow between components. This diagram is applicable to Kubernetes clusters launched with Rancher using RKE. At NGINX, we are building a suite of tools to ensure observability, reliability, governance, and security across all three planes.Ĭontact us today to learn how we can help you deliver modern apps.This section describes the roles for etcd nodes, controlplane nodes, and worker nodes in Kubernetes, and how the roles work together in a cluster. In this hybrid and fast-evolving landscape, a cloud-native management solution is needed to effectively connect, operate, and secure a complex portfolio of microservices and applications. To learn more about what the control plane can do, read The New Stack article Data, Control, Management: Three Planes, Different Altitudes. scheduling), while detecting and responding to cluster events. The control plane’s components make global decisions about the cluster (e.g. After the data plane governs data flow through applications and pod-level app behavior, the control plane guides the data plane, overseeing orchestration and coordination of containers, nodes, pods, and clusters. It was originally a policy engine for Layer 4 networking and now also has influence over Layer 7 traffic in Kubernetes. The control plane resides above the data plane, as a separate entity, and enforces rules for the data plane. Due to their lack of visibility and gaps in governance, distributed environments expand the threat surface and increase the likelihood of outages. ![]() ![]() When deploying cloud-native applications, this management system is needed to simplify the creation and implementation of traffic management and security policies across distributed environments. In addition to the control and data planes, cloud-native management also operates via a management plane. In modern application architectures, a control plane configures rules for the data plane.
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