Kubernetes

Kubernetes is an open-source container orchestration system for automating software deployment, scaling, and management

K8S is a container orchestration technology that creates, deploy and manages clusters(bunch of docker containers)
It schedules, runs and manages isolated containers which are running on virtual/physical/cloud machines
Convert isolated containers running on different H/W into cluster
All 3 clouds support Kubernetes (AWS, Azure, Google)

Advantages

K8S Master:

Kube-api server - Interact directly with user using yaml file

Kube scheduler - Take actions on the request (Handle creation and management)

Controller manager - Makesure the state of cluster matches to its desired state

etcd - Store metadata and status of cluster

Slave:

Kubelet - Agent listen to master Port: 10255

container engine: Work with kubelet, Start/stop container, Pulling images

kube-proxy - It assigns IP address for each POD/container

kubectl - Single cloud

kubeadm - on premise

kubefed - federated

Installation

setup 3 AWS server 1 as master and 2 slaves (Min Spec: 2 core and 3GB ram for master, 1 core 1 GB ram for slave)

After that we will get some command that we needs to be run on slave to establish connection with master

UDEMY References: Mumshad Munambeth

vi filename.yaml

apiVersion: V1

kind: pod

metadata:

name: nginx

labels:

app: nginx

tier: frontend

spec:

containers:

-name: nginx

image: nginx

-name: centos

image: centos

#Note: in this YAML script "apiVersion, kind, metadata and Spec" are the mandatory fields

# How to execute: kubectl apply -f filename.yaml

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