2025-01-07 kubernetes

Kubernetes Architecture

Creating cluster on aws

Prerequisites

• kubectl
• eksctl
• aws

Steps

1. create ec2 instance
2. add admin role on it
3. install Prerequisites on it

Install kubectl binary from official website

# for x86_64
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
 
# for arm64
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/arm64/kubectl"

Install eksctl binary from its official website

# for ARM systems, set ARCH to: `arm64`, `armv6` or `armv7`
ARCH=amd64
PLATFORM=$(uname -s)_$ARCH
 
curl -sLO "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_$PLATFORM.tar.gz"
 
# (Optional) Verify checksum
curl -sL "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_checksums.txt" | grep $PLATFORM | sha256sum --check
 
tar -xzf eksctl_$PLATFORM.tar.gz -C /tmp && rm eksctl_$PLATFORM.tar.gz
 
sudo mv /tmp/eksctl /usr/local/bin

Write this script into script.sh file and run it with bash script.sh

Check if commands working properly:

# see kubectl version
kubectl version
 
# see eksctl version
eksctl version

and run Create Cluster command

eksctl create cluster --name clustername --node-type t2.medium --nodes 2 --region=us-east-1

To See nodes

kubectl get nodes

To See pods

kubectl get pods -A

write pod.yaml manifest and apply

kubectl apply -f pod.yaml

get info about pods

kubectl describe pod nginx

Read about:

Manifest
YAML

POD
Repl set
Deployments
Services
	Load balancer
	Node pod
	cluster ip
config
	secrets
	configMap
Namespace
Resources
Resource Quota
Volume
Ingress
HPA

Pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  containers:
  - image:
    name:
    ports:
      container-port: 80

s comes - comes - means array

cluster version updates comes in every 4 month minimum n-2 version compatible for client to support with latest version of kubernetes

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Tasks

1. Task 6 How to set permanent alias
2. Task 7 Create LAMP Server

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