![]() 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. On this topic.This section describes the roles for etcd nodes, controlplane nodes, and worker nodes in Kubernetes, and how the roles work together in a cluster. You may wish to consult the following resources for additional information To continue in the Beginner’s Guide to Kubernetes series, visit part 3:īeginner’s Guide to Kubernetes, Part 1: Introductionīeginner’s Guide to Kubernetes, Part 2: Master, Nodes, and the Control Plane (You Are Here)īeginner’s Guide to Kubernetes, Part 3: Objectsīeginner’s Guide to Kubernetes, Part 4: Controllersīeginner’s Guide to Kubernetes, Part 5: Conclusion It’s written in Go and uses the Raft protocol which means it maintains identical logs of state changing commands across nodes and coordinates the order in which these state changes occur. It stores and replicates the entirety of the Kubernetes cluster state. ![]() Etcd is a highly available key-value store that provides the backend database for Kubernetes.For more information on kube-scheduler, consult the Kubernetes kube-scheduler documentation. kube-scheduler is a function that looks for newly created Pods that have no Nodes, and assigns them a Node based on a host of requirements.For more on Controllers, see the Beginner’s Guide to Kubernetes: Controllers. kube-controller-manager is a daemon that manages the Kubernetes control loop.kube-apiserver is the front end for the Kubernetes API server.kube-apiserver, kube-controller-manager, and kube-scheduler are processes and etcd is a database all four are run by the Kubernetes Master. The control plane is responsible for making decisions about the cluster, and pushing it toward the desired state. Together, kube-apiserver, kube-controller-manager, kube-scheduler, and etcd form what is known as the control plane. This is only used to connect to Services. kube-proxy is a networking proxy that proxies the UDP, TCP, and SCTP networking of each Node, and provides load balancing.kubelet receives descriptions of the desired state of a Pod from the API server, and ensures the Pod is healthy, and running on the Node.In addition to running your application, each Node runs two processes: The number of Nodes is determined by the user, and they are created by the user. Kubernetes Nodes are worker servers that run your application(s). ![]() It does this by telling the Nodes how many instances of your application it should run and where. The Kubernetes Master is normally a separate server responsible for maintaining the desired state of the cluster. In this guide you will learn about the Master server, cluster nodes, and the Kubernetes Control Plane. Together, these servers form a cluster and are controlled by the services that make up the Control Plane. These servers can be Linodes, VMs, or physical servers. This is the second guide in the Beginner’s Guide to Kubernetes series that explains the major parts and concepts of Kubernetes.Īt the highest level of Kubernetes, there exist two kinds of servers, a Master and a Node.
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