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kops-kubernetes-cluster-configuration

Landmark Technologies, - Landmark Technologies

Tel: +1 437 215 2483, - +1 437 215 2483

[email protected], - www.mylandmarktech.com

Setting up Kubernetes (K8s) Cluster on AWS Using KOPS

1.kops is a software use to create production ready k8s cluster in a cloud provider like AWS.

  1. kOPS SUPPORTS MULTIPLE CLOUD PROVIDERS

  2. Kops compete with managed kubernestes services like EKS, AKS and GKE

  3. Kops is cheaper than the others.

  4. Kops create production ready K8S.

  5. KOPS create resources like: LoadBalancers, ASG, Launch Configuration, woker node Master node (CONTROL PLANE.

  6. KOPS is IaaC

#!/bin/bash

1) Create Ubuntu EC2 instance in AWS

2a) create kops user

 sudo adduser kops
 sudo echo "kops  ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/kops
 sudo su - kops

2a) install AWSCLI using the apt package manager

sudo apt install awscli -y

or 2b) install AWSCLI using the script below

sudo apt update -y
sudo apt install unzip wget -y
sudo curl https://s3.amazonaws.com/aws-cli/awscli-bundle.zip -o awscli-bundle.zip
sudo apt install unzip python -y
sudo unzip awscli-bundle.zip
sudo ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws

3) Install kops software on an ubuntu instance by running the commands below:

sudo apt install wget -y
sudo wget https://github.com/kubernetes/kops/releases/download/v1.22.0/kops-linux-amd64
sudo chmod +x kops-linux-amd64
sudo mv kops-linux-amd64 /usr/local/bin/kops

4) Install kubectl kubernetes client if it is not already installed

 sudo curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
 sudo chmod +x ./kubectl
 sudo mv ./kubectl /usr/local/bin/kubectl

5) Create an IAM role from AWS Console or CLI with the below Policies.

AmazonEC2FullAccess 
AmazonS3FullAccess
IAMFullAccess 
AmazonVPCFullAccess

Then Attach IAM role to ubuntu server from Console Select KOPS Server --> Actions --> Instance Settings --> Attach/Replace IAM Role --> Select the role which You Created. --> Save.

6) create an S3 bucket

Execute the commands below in your KOPS control Server. use unique s3 bucket name. If you get bucket name exists error.

aws s3 mb s3://class30kops
aws s3 ls # to verify

6b) create an S3 bucket

Expose environment variable:
# Add env variables in bashrc

   vi .bashrc
# Give Unique Name And S3 Bucket which you created.
export NAME=class30.k8s.local
export KOPS_STATE_STORE=s3://class30kops

  source .bashrc

7) Create sshkeys before creating cluster

    ssh-keygen

8) Create kubernetes cluster definitions on S3 bucket

kops create cluster --zones us-east-1a --networking weave --master-size t2.medium --master-count 1 --node-size t2.medium --node-count=2 ${NAME}
# copy the sshkey into your cluster to be able to access your kubernetes node from the kops server
kops create secret --name ${NAME} sshpublickey admin -i ~/.ssh/id_rsa.pub

9) Initialise your kops kubernetes cluser by running the command below

kops update cluster ${NAME} --yes

10a) Validate your cluster(KOPS will take some time to create cluster ,Execute below commond after 3 or 4 mins)

kops validate cluster

   Suggestions:
  • validate cluster: kops validate cluster --wait 10m
  • list nodes: kubectl get nodes --show-labels
  • ssh to the master: ssh -i ~/.ssh/id_rsa [email protected]
  • the ubuntu user is specific to Ubuntu. If not using Ubuntu please use the appropriate user based on your OS.
  • read about installing addons at: https://kops.sigs.k8s.io/operations/addons.

10b - Export the kubeconfig file to manage your kubernetes cluster from a remote server. For this demo, Our remote server shall be our kops server

 kops export kubecfg $NAME --admin

11a) To list nodes and pod to ensure that you can make calls to the kubernetes apiSAerver and run workloads

  kubectl get nodes

11b) Alternative you can ssh into your kubernetes master server using the command below and manage your cluster from the master

sh -i ~/.ssh/id_rsa ubuntu@ipAddress
ssh -i ~/.ssh/id_rsa [email protected]
ssh -i ~/.ssh/id_rsa [email protected]

11b. Alternative, Enable PasswordAuthentication in the master server and assign passwd

sudo sed -i "/^[^#]*PasswordAuthentication[[:space:]]no/c\PasswordAuthentication yes" /etc/ssh/sshd_config
sudo service sshd restart
sudo passwd ubuntu

11c) To list nodes

  kubectl get nodes

12) To Delete Cluster

kops delete cluster --name=${NAME} --state=${KOPS_STATE_STORE} --yes

====================================================================================================

13 # IF you want to SSH to Kubernetes Master or Nodes Created by KOPS. You can SSH From KOPS_Server

sh -i ~/.ssh/id_rsa ubuntu@ipAddress ssh -i ~/.ssh/id_rsa [email protected]

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