What is a Kubernetes node?

A Node is a worker machine in Kubernetes and may be either a virtual or a physical machine, depending on the cluster. Kubelet, a process responsible for communication between the Kubernetes control plane and the Node; it manages the Pods and the containers running on a machine.

What is difference between cluster and namespace in Kubernetes?

4 Answers. You use multiple contexts to target multiple different Kubernetes clusters. You can quickly switch between clusters by using the kubectl config use-context command. Namespaces are a way to divide cluster resources between multiple users (via resource quota).

What is difference between node and cluster in Kubernetes?

A Kubernetes cluster is a set of node machines for running containerized applications. If you’re running Kubernetes, you’re running a cluster. At a minimum, a cluster contains a control plane and one or more compute machines, or nodes. Nodes actually run the applications and workloads.

What is Scheduler in Kubernetes?

The Kubernetes scheduler is a control plane process which assigns Pods to Nodes. The scheduler determines which Nodes are valid placements for each Pod in the scheduling queue according to constraints and available resources. The scheduler then ranks each valid Node and binds the Pod to a suitable Node.

What is the purpose of a namespace?

Namespaces provide a way of declaring variables within a program that have similar names​. It allows users to define functions with the same name as a function in a pre-defined library or used-defined functions within main() . Namespaces can also be used to define classes, variable names, and functions.

Can we rename a namespace in Kubernetes?

There is no easy way to change namespace in Kubernetes using kubectl command line utility. But here are some commands that you can alias in your bashrc file so that it’s just a single command that you can use to change the namespace in the Kubernetes cluster.

What is Minikube in Kubernetes?

Like kind , minikube is a tool that lets you run Kubernetes locally. minikube runs a single-node Kubernetes cluster on your personal computer (including Windows, macOS and Linux PCs) so that you can try out Kubernetes, or for daily development work.

Why does node have 3 clusters?

Having a minimum of three nodes can ensure that a cluster always has a quorum of nodes to maintain a healthy active cluster. With two nodes, a quorum doesn’t exist. Without it, it is impossible to reliably determine a course of action that both maximizes availability and prevents data corruption.

What is the difference between cluster and node?

Nodes store and process data. Nodes can be a physical computer or a virtual machine (VMs). A cluster is a group of servers or nodes. Using the same train analogy from our Kubernetes 101 post, we called the nodes the individual train cars, such as a tanker or a freight car.