Debug School: Arun Basu

Assignment #3 - Day 3

Arun Basu — Mon, 25 Sep 2023 07:45:32 +0000

what is service ?

A Kubernetes service is a logical collection of pods in a Kubernetes cluster. We can define a K8s service as an abstract way to load balance across the pods and expose an application deployed on a set of Pods.

Four types of kuberenets services

ClusterIP
This is the default type that exposes the service on an internal IP of the cluster. These services are only accessible within the cluster. So, users need to implement port forwarding or a proxy to expose a ClusterIP to a wider ingress of traffic.

NodePort
A NodePort service exposes the service on the IP of each node at a static port. A ClusterIP service is created automatically to route the traffic to the NordPort service. Users can communicate with the service from the outside by requesting :

LoadBalancer
This is the preferred solution to expose the cluster to the wider internet. The LoadBalancer type of service will create a load balancer (load balancer type depends on the cloud provider) and expose the service externally.

It will also automatically create ClusterIP and NodePort services and route traffic accordingly

Implementation

Two pods having two difference images

*Service create *

kubectl create service clustorip arun-nginx  --tcp=5678:80

*Selector label matched *

*Loadbalanacing *

*TEST *

Assignment#2!

Arun Basu — Fri, 22 Sep 2023 11:59:34 +0000

What is Namespaces? Explain with Image

In Kubernetes, namespaces provides a mechanism for isolating groups of resources within a single cluster.

What is Pod? Explain with Image

A pod is the smallest execution unit in Kubernetes.

What is ReplicaSets? Explain with Image

A ReplicaSet ensures that a specified number of pod replicas are running at any given time.

What is Deployment? Explain with Image

A Deployment manages a set of Pods to run an application workload,

Kubernetes Assignments !

Arun Basu — Thu, 21 Sep 2023 09:32:22 +0000

What is Kubernetes?

Ans: Kuberenets is open source orchestration platform which is managing centralized services.

Why do we need it?

Ans: K8 handle containers and running application in such manner, where downtime is not required.

How it works?

Master node : END user - > API server -> ETCD -> controllers -> scheduler

Worker node node : Kubelet Kube-proxy container runtime

What are the components of Master?

Ans : a. API server b. ETCD c. controllers d. scheduler

What are the components of Worker?

Ans : a. Kubelet b. Kube-proxy c. container runtime ( docker/rkt )