kube-apiserver The API server is a component of the Kubernetes control plane that exposes the Kubernetes API. The API server is the front end for the Kubernetes control plane. The main implementation of a Kubernetes API server is kube-apiserver. kube-apiserver is designed to scale horizontally—that is, it scales by deploying more instances. You can run several instances of kube-apiserver and balance traffic between those instances. etcd Consistent and highly-available key value store used as Kubernetes’ backing store for all cluster data. If your

A pod is a unit which can have one or more unit which can be runIt will have a unique IPIt will have config info for a containerThe pod initialize the containerThe will in running state when the container is started.The pod ceases to exist when the container is terminatedPod can not be restarted, we can start a similar podIt is like a logical host for the containerEvery pod has the status likePending : created but the container is not

Write down 10 features of Kubernetes with image Helps manage large clusters Load balancing Service discovery Self monitoring Security Storage services Automated rollbacks Optimum resource utilization Auto scalable Predictable What are the components of Kubernetes master and explain each component’s function?API Server-All requests come to API server. REST based.etcd-storage for cluster configuration and stateController-keeps tracks of the pods and reports to API serverScheduler-assigns a pod to a node based on resource requirements What are the components of Kubernetes worker and

Pods 2. Master and worker nodes 3. Scalable 4. load balancer 5. Cluster 6. Containers 7. Self healing 8. Service

kube-proxy kube-proxy is a network proxy that runs on each node in your cluster, implementing part of the Kubernetes Service concept. kube-proxy maintains network rules on nodes. These network rules allow network communication to your Pods from network sessions inside or outside of your cluster. kube-proxy uses the operating system packet filtering layer if there is one and it’s available. Otherwise, kube-proxy forwards the traffic itself. Container runtime The container runtime is the software that is responsible for running containers. Kubernetes supports several container runtimes: Docker, containerd, CRI-O,

Components of kubernetes worker Kubelet-Kubelet runs the pods in worker node Container Engine – Runs the containers in the pods.eg docker,rkt etc Kube proxy- Kube proxy provide pods IP address and load balances all pods in a service

A pod is the smallest execution unit in Kubernetes. A Kubernetes pod is a collection of one or more Linux® containers, and is the smallest unit of a Kubernetes application. A pod encapsulates one or more applications. Pods are ephemeral by nature, if a pod (or the node it executes on) fails, Kubernetes can automatically create a new replica of that pod to continue operations.  Pods include one or more containers (such as Docker containers) Pods represent the processes running on a cluster Any given

API Server Its process the incoming API request from UI/CLI It Uses RESTAPI Controller Controls the Kubernetes cluster Kubernetes include the Endpoints Controller, Replication Controller, and Namespace Controller observes the state of the cluster scheduler Schedules Pods Scheduler maintains the work Cluser store permanent storage for Cluster config

The components of K8s worker node are1. kubelet – Kublet is the main K8s agent. It instantiate the pods in the node(only instantiate not create). It helps to register nodes with cluster. Its always watch the api server.It decides who is the master.10255 is the endpoint.2. kube-proxy – Its support for K8s networking. It assigns the ip address for the pods. Each pods inside a node will have same ip address. Load balances across all pods in a service. kube-proxy

In a Kubernetes cluster, we package our application and give it to the “Master”.Master will distribute it to the nodes (minions) which do the actual work. In the Master (representation above), there is a Control plane which has 4 components: API ServerActs as the entry point to the control plane.It exposes a REST API which consumes JSON files that has the application definition and state defined.Master checks the JSON file and pass the task onto one of the nodes in

A pod is the smallest execution unit in Kubernetes A Pod (as in a pod of whales or pea pod) is a group of one or more containers, with shared storage and network resources, and a specification for how to run the containers.  Pods can communicate with each other by using another pods IP address or by referencing a resource that resides in another pod. Pods are created by workload resources called controllers, which manage rollout, replication, and health of pods in the cluster.

kubelet : This component ensure that containers are running in the podkube-proxy : This the network proxy that is running on each nodeDocker or any container runtime : this will run the docker/ any other container

API Server – It serves as the component where the kubernetes receives the input from the external application or end user. etcd Cluster – It serves as the brain of the kubernetes where the information are stored as a key value pair. kube-scheduler It always run in the background. It is where the pods runtime are schedules. Control Manager It is responsible for running multiple distinct applications

a) Kubelete Main Kubernetes agent Registers node with cluster (decide who is the master node) Watches api server Instantiates the pods ( not creating the pod) Reports back to master Expose endpoint on 10255 b) kube-proxy Manages the kubernetes networking Assigning pod IP address (indirectly) All containers in a pod share a single IP Load balances across all pods in service Can use different network plugins/drivers like calico (CNI plugins) c) Container Engine Container Management Pulling images start/stop the containers

Write down 10 features of Kubernetes with image? Storage orchestration Auto scaling Load balancing Self healing Container grouping using pod Automate roll backs What are the components of Kubernetes master and explain each component’s function? Apiserver: exposes REST APIs. This is the entry point to the k8s cluster. API server access JSON data via manifest file Cluster store: Stores cluster state and configurations. Controller manager: Controller of controllers like node controller, namespace controller, etc. Each controller has its own responsibilities

Below are the main components found on a (worker) node: kubelet – the main service on a node, regularly taking in new or modified pod specifications (primarily through the kube-apiserver) and ensuring that pods and their containers are healthy and running in the desired state. This component also reports to the master on the health of the host where it is running. kube-proxy – a proxy service that runs on each worker node to deal with individual host subnetting and expose services

kubelet The kubelet takes a set of PodSpecs that are provided through various mechanisms and ensures that the containers described in those PodSpecs are running and healthy. kube-proxy Kube-proxy is a network proxy that runs on each node in your cluster. kube-proxy maintains network rules on nodes. These network rules allow network communication to your Pods from network sessions inside or outside of your cluster. container runtime like docker ctr

kubernetes simplifies the data ware house into a cluster, which can operate via a laptop kubernetes help us to scale up our application so fast