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Arun Ramachandran
Arun Ramachandran

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Kubernetes in AWS with kops

#devops #aws #kubernetes #docker

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

Image description

AWS

  1. Create an IAM User
  2. Assign the Permissions
  3. Create S3 bucket for storing KOPS_STORE_STATE
  4. 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
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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
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sudo apt-get install -y apt-transport-https ca-certificates curl
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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
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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
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Update apt package index with the new repository and install kubectl

sudo apt-get update

sudo apt-get install -y kubectl
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Installing AWS CLI

sudo  apt install awscli
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Verify AWS CLI using command

 aws
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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
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Configure User with AWS Account.

Run command on your machine

aws configure
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Provide AWS access Key and AWS Secret Access Key.

Specify Default region or Output format.

Verify credentials and config.

 ls -lrt ~/.aws/
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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
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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
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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
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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>
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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
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Verify Node Status 

kubectl get node
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Validate Cluster 

kops validate cluster --state=<s3://<Define S3 Bucket Name>
kops validate cluster --state=s3://k8s-test-123`
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### 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
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Verify Kubernetes Cluster.(Different Formats)

   kops validate cluster
   kops validate cluster -o json
   kops validate cluster -o yaml
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Start the Deployment on Kubernetes Cluster.

 kubectl create deployment myweb --image=cloudmates/customnginx
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Get Information of Running Deployments

kubectl get deployments
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Describe the Running Deployment

 kubectl describe deployment myweb
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Make the myweb container accessible via the internet loadbalancer

kubectl create service loadbalancer myweb --tcp=80:80
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Get Running Services

kubectl get svc
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Remove Services

 kubectl delete services myweb
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Remove Deployment

 kubectl delete deployment myweb
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Delete Cluster

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