Debug School: Ananthu PM

K8S - Service

Ananthu PM — Mon, 25 Sep 2023 07:34:41 +0000

What is service?

service is a routing used to manage network traffic between pods.
When we have multiple pods service make management and discovery of service make easy.

service manage pods which match the pods label with service selector field.

Service can be creating as 4 types:

clusterip
nodeport
loadbalancer
ExternalName

clusterip

cluserip used to create service which need to accessible only inside the cluster.
which manage different pods as single endpoint.

kubectl create service clusterip service-name --tcp=5678:80

nodeport

nodeport used to create service and port forward to each Node/host port include master node.

kubectl create service nodeport service-name --tcp=5678:80

loadbalancer

load balancer create service that can be accessible from out side as single endpoint and this service balance the traffic and route the traffic to the node port which port forward to the clusterip service.

kubectl create service loadbalancer service-name --tcp=5678:80

Assignment#2 – Day 2

Ananthu PM — Fri, 22 Sep 2023 12:02:08 +0000

What is Namespaces? Explain with Image

Namespaces is a logical division in cluster

What is Pod? Explain with Image

Pod is atomic logical unit which contain containers.

What is ReplicaSets? Explain with Image

Replica-Sets create to overcome replication controller bugs, which help to create multiple instances of pod.

What is Deployment? Explain with Image

Deployment contain: replica, controller, rollout, rollback ,version , which use Replica Sets set for replica and controller
rollback , rollout, version for versioning and upgrade or downgrade the application in less time.
recreate and rollback are 2 rollback strategy and rollback is default

K8S for me

Ananthu PM — Thu, 21 Sep 2023 09:14:30 +0000

What is Kubernetes?

Kubernetes is application that help to manage and scale the containers easily for large scale applications.

Why do we need it?

In containerized application we have lots of drawback like scalability, auto heal, maintainability.
K8s introduced to overcome this all the problems.

How it works?

K8s have master Nodes or multi master nodes and worker nodes, where master node manages schedule job for worker node. through the help of apiservers, controllers and schedulers.

What are the components of Master?

api-server, controller manger, etcd, scheduler

What are the components of Worker?

kuelet, docker-engine, controller proxy