DEV Community: Arun Ramachandran

k8s kops

Arun Ramachandran — Sat, 18 May 2024 12:09:35 +0000

without specifying disk size

kops create cluster --yes --state=s3://kops-dev-storage --zones=ap-south-1a --node-count=1 --node-size=t2.medium --master-size=t2.medium --name=democluster.k8s.local
kops validate cluster --wait 10m

with specifying disk size

kops create cluster --yes \
    --state=s3://kops-dev-storage \
    --zones=ap-south-1a \
    --node-count=1 \
    --node-size=t2.small \
    --node-volume-size=10 \
    --master-size=t2.medium  \
    --master-volume-size=10 \
    --name=k8s.k8s.local

Kubernetes-Zero-to-Hero
Creating this repo with an intent to make Kubernetes easy for begineers. This is a work-in-progress repo.

Kubernetes Installation Using KOPS on EC2
Create an EC2 instance or use your personal laptop.
Dependencies required

Python3
AWS CLI
kubectl
Install dependencies
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y python3-pip apt-transport-https kubectl
pip3 install awscli --upgrade
export PATH="$PATH:/home/ubuntu/.local/bin/"

Install KOPS (our hero for today)

curl -LO https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-linux-amd64

chmod +x kops-linux-amd64

sudo mv kops-linux-amd64 /usr/local/bin/kops
Provide the below permissions to your IAM user. If you are using the admin user, the below permissions are available by default
AmazonEC2FullAccess
AmazonS3FullAccess
IAMFullAccess
AmazonVPCFullAccess
Set up AWS CLI configuration on your EC2 Instance or Laptop.
Run aws configure

Kubernetes Cluster Installation
Please follow the steps carefully and read each command before executing.

Create S3 bucket for storing the KOPS objects.

aws s3mb s3://kops-abhi-storage = us-east-1

Create the cluster

kops create cluster --name=demok8scluster.k8s.local --state=s3://kops-abhi-storage --zones=us-east-1a --node-count=1 --node-size=t2.micro --master-size=t2.micro --master-volume-size=8 --node-volume-size=8
Important: Edit the configuration as there are multiple resources created which won't fall into the free tier.
kops edit cluster myfirstcluster.k8s.local
Step 12: Build the cluster

kops update cluster demok8scluster.k8s.local --yes --state=s3://kops-arun-storage

This will take a few minutes to create............

After a few mins, run the below command to verify the cluster installation.

kops validate cluster demok8scluster.k8s.local

kubernets cluster on amazon eks

Arun Ramachandran — Wed, 19 Jul 2023 17:55:05 +0000

create an iam role (eks-cluster)
create stack for eks cluster(vpc,subnets,etc...)
for creating cluster stack use CloudFormation templates availabe in amazon documentation click here
after creating the stack create eks cluster from amazon console and update the required details and create cluster
to communicate local system to the cluster run the below command (run this on your local computer)
aws eks update-kubeconfig --name your cluster-name
Create Role for NodeGroup and attach the given policies
1. AmazonEC2ContainerRegistryReadOnly
2. AmazonEKS_CNI_Policy
3. AmazonEKSWorkerNodePolicy
Then Add Node Group goto amazon eks console and create nodegroup under compute tab in your cluster - given a Name and attach the NodeGroup role under Node IAM Role

Linux Basics

Arun Ramachandran — Fri, 22 Jul 2022 07:00:31 +0000

How to Install Kubernetes Cluster in Linux

Arun Ramachandran — Tue, 28 Jun 2022 10:51:10 +0000

https://www.linuxtechi.com/install-kubernetes-k8s-on-ubuntu-20-04/

refer this link if installation getting error
https://github.com/containerd/containerd/issues/6970

do this command solve：
rm /etc/containerd/config.toml
systemctl restart containerd

https://www.howtoforge.com/tutorial/install-laravel-on-ubuntu-for-apache/

Kubernetes in AWS with kops

Arun Ramachandran — Thu, 23 Jun 2022 15:59:00 +0000

Kops is an official Kubernetes project for managing a Kubernetes clusters in aws.
Kops Stands for Kubernetes Operations.
Kops is currently the best tool to deploy Kubernetes clusters to Amazon Web Services.
Kops has commands for creating clusters, updating settings, and applying changes , Kops automates a large part of operating Kubernetes on AWS.
Kops only availabe for Linux and Mac Platforms.

Prepare AWS for Kops

Management Node (Local System - ubuntu 20.0.4)

In this management node below requirements must be required for kops.

1.kops
2.kubectl
3.aws cli
4.s3 bucket access

AWS

Create an IAM User
Assign the Permissions
Create S3 bucket for storing KOPS_STORE_STATE
Route53

Install kops on Ubuntu 20.0.4

curl -Lo kops https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-linux-amd64
chmod +x kops
sudo mv kops /usr/local/bin/kops

Install kubectl on Ubuntu 20.0.4

Update the apt package index and install packages needed to use the Kubernetes apt repository

sudo apt-get update

sudo apt-get install -y apt-transport-https ca-certificates curl

Download the Google Cloud public signing key:

sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

Add the Kubernetes apt repository

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

Update apt package index with the new repository and install kubectl

sudo apt-get update

sudo apt-get install -y kubectl

Installing AWS CLI

sudo  apt install awscli

Verify AWS CLI using command

aws

Create/Log-in AWS Console Account.

SetUp AWS IAM permission for Kops.

Create a user(kops) and give them permission.

Permission required for Kops user

AmazonEC2FullAccess
AmazonRoute53FullAccess
AmazonS3FullAccess
IAMFullAccess
AmazonVPCFullAccess
OR
AdministratorAccess

Configure User with AWS Account.

Run command on your machine

aws configure

Provide AWS access Key and AWS Secret Access Key.

Specify Default region or Output format.

Verify credentials and config.

 ls -lrt ~/.aws/

S3 bucket for the KOPS_STATE_STORE.

KOPS_STATE_STORE is the source of truth for all clusters managed by Kops.

Get fastest Region for Deploy the S3 Bucket.

Create an S3 bucket for KOPS_STATE-STORE

aws s3 mb s3://<bucket-name>
aws s3 mb s3://k8s-test-123

User can use cloudping to choose the fastest region as per their location.

Kops clusters must be valid DNS names.

We need to SetUp DNS for the Kops Clusters.

SetUp DNS in AWS Route53.

I have a Domain cloudmates.in which is availabe in Godaddy

For creating DNS in Route53

Go to Route53
Create Hosted Zone
Zone Name kops.cloudmates.in
Copy The NS records and create NS in your Domain Name Provider once completes validate the dns

dig -t ns=kops.cloudmates.in

With Kops 1.6.2 or later, then DNS configuration is optional.
The only requirement to trigger this is to have the cluster name end with .k8s.local
SetUp Kubernetes Cluster on AWS with Kops

Generate SSH Key

ssh-keygen -f .ssh/id_rsa

Create Cluster Syntax

kops create cluster --yes --state=<s3://<Define S3 Bucket Name>> --zones=<One or more Zones> --node-count=<Number of Nodes> --node-size=<Define Machine Size> --master-size=<Master Node Size>  --name=<Define DNS Name>

Create Cluster with Route53 hosted zone

kops create cluster --yes --state=s3://k8s-storage-a12345 --zones=ap-south-1a --node-count=2 --node-size=t2.micro --master-size=t2.micro --name=kops.cloudmates.in

Verify Node Status

kubectl get node

Validate Cluster

kops validate cluster --state=<s3://<Define S3 Bucket Name>
kops validate cluster --state=s3://k8s-test-123`

### Execute Custom Image on AWS kubernetes

*Create AWS Kubernetes Cluster Without Domain Name *

   kops create cluster --yes --state=s3://k8s-test-123 --zones=ap-south-1a --node-size=t2.micro --node-count=2 --master-size=t2.micro --name=test.k8s.local

Verify Kubernetes Cluster.(Different Formats)

   kops validate cluster
   kops validate cluster -o json
   kops validate cluster -o yaml

Start the Deployment on Kubernetes Cluster.

 kubectl create deployment myweb --image=cloudmates/customnginx

Get Information of Running Deployments

kubectl get deployments

Describe the Running Deployment

 kubectl describe deployment myweb

Make the myweb container accessible via the internet loadbalancer

kubectl create service loadbalancer myweb --tcp=80:80

Get Running Services

kubectl get svc

Remove Services

 kubectl delete services myweb

Remove Deployment

 kubectl delete deployment myweb

Delete Cluster

kops delete cluster cloudmates.in --yes --state=s3://k8s-test-123