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Kubernetes-setup.MD

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Setup Kubernetes (K8s) Cluster on AWS

  1. Create Ubuntu EC2 instance

  2. install AWSCLI

     curl https://s3.amazonaws.com/aws-cli/awscli-bundle.zip -o awscli-bundle.zip
 apt install unzip python
 unzip awscli-bundle.zip
 #sudo apt-get install unzip - if you dont have unzip in your system
 ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws

  3. Install kubectl on ubuntu instance

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

  4. Install kops on ubuntu instance

     curl -LO  https://github.com/kubernetes/kops/releases/download/1.15.0/kops-linux-amd64
 chmod +x kops-linux-amd64
 sudo mv kops-linux-amd64 /usr/local/bin/kops
 kops version (it should be 1.15.0)
 Note: use below command if you wish to use latest version. For now we could see latest version of kops. So ignore it until further update. 
 # 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

  5. Create an IAM user/role with Route53, EC2, IAM and S3 full access

  6. Attach IAM role to ubuntu instance

    # Note: If you create IAM user with programmatic access then provide Access keys. Otherwise region information is enough
aws configure

  7. Create a Route53 private hosted zone (you can create Public hosted zone if you have a domain)

    Routeh53 --> hosted zones --> created hosted zone  
Domain Name: valaxy.net
Type: Private hosted zone for Amazon VPC. Make sure you are chosing right VPC if you have multiple

  8. create an S3 bucket

     aws s3 mb s3://demo.k8s.valaxy.net

  9. Expose environment variable:

     export KOPS_STATE_STORE=s3://demo.k8s.valaxy.net

  10. Create sshkeys before creating cluster

     ssh-keygen

  11. Create kubernetes cluster definitions on S3 bucket

    kops create cluster --cloud=aws --zones=ap-south-1b --name=demo.k8s.valaxy.net --dns-zone=valaxy.net --dns private

  12. Create kubernetes cluser

    kops update cluster demo.k8s.valaxy.net --yes

  13. To cahnge the kubernetes master and worker instance sizes

    kops edit ig --name=<cluster_name> nodes
#kops edit ig --name=demo.k8s.valaxy.net nodes 
kops edit ig --name=<cluster_name> master-<zone_name>
#kops edit ig --name=demo.k8s.valaxy.net master-ap-south-1b

  14. to Delete cluster (try once your lab is done)

    kops delete cluster <cluster_name> --yes

  15. Validate your cluster

     kops validate cluster

  16. To list nodes

    kubectl get nodes

Deploying Nginx pods on Kubernetes

  1. Deploying Nginx Container

    kubectl run --generator=run-pod/v1 sample-nginx --image=nginx --replicas=2 --port=80
#kubectl run sample-nginx --image=nginx --replicas=2 --port=80
# kubectl run simple-devops-project --image=yankils/simple-devops-image --replicas=2 --port=8080
kubectl get pods
kubectl get deployments

  2. Expose the deployment as service. This will create an ELB in front of those 2 containers and allow us to publicly access them.

    kubectl expose deployment sample-nginx --port=80 --type=LoadBalancer
# kubectl expose deployment simple-devops-project --port=8080 --type=LoadBalancer
kubectl get services -o wide