The latter is designed for stateful workloads, and makes it easier to work with persistent storage. The former are mainly useful for stateless workloads. Pods can run as non-persistent Deployments or as StatefulSets. A pod can host one container of a set of tightly coupled containers. Pods are small and simple units that work as a single instance of an application. If you need to scale up the capacity of the cluster, you can provision more nodes. Containers are deployed inside pods, and the pods run inside nodes. Nodes are responsible for running applications.Īn application is deployed inside containers, but containers do not run alone. NodesĪ Kubernetes node is a physical or virtual machine located in the cloud or on-premises. To ensure optimal performance, cloud-controller-manager separates the components that interact only with the cluster from the components that interact with the cloud platform.
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Once the cluster and the cloud platform are connected, you can use it to scale horizontally. You can use the cloud controller manager to link a Kubernetes cluster to the API of your cloud provider. This is a component of the control plane that can embed cloud control logic. It is important to secure etcd in your Kubernetes clusters, because attackers who take control of etcd have effective control over the entire cluster. It is a critical component of a Kubernetes cluster, and is therefore distributed and fault-tolerant. Service account and token controllers – when a new namespace is created, this controller creates default accounts and API access tokensĮtcd is a key-value store that holds information about configuration data and cluster status.Job controller – deploys pods to run jobs, which are one-time tasks, until they complete.
![what is kubernetes clusters what is kubernetes clusters](https://docs.microsoft.com/en-us/azure-stack/aks-hci/media/concepts/architecture.png)
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What are the Components of a Kubernetes Cluster?Ī Kubernetes cluster consists of nodes and a control plane. What are the Components of a Kubernetes Cluster?.Kubernetes clusters offer powerful capabilities for resource provisioning and utilization, to ensure the desired levels of performance and uptime for applications.
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The architecture of a Kubernetes cluster enables you to schedule and run containers across a collection of nodes, regardless of where the nodes are physically deployed. It is managed by a control plane, which is responsible for the orchestrating container activity on the nodes, and maintaining the desired cluster state. A Kubernetes cluster is a collection of nodes on which workloads can run-these can be physical (bare metal) machines, or virtual machines (VMs), or serverless compute systems like Amazon Fargate. Kubernetes is a container orchestrator used to deploy, automate and manage large-scale containerized workloads.