Kubernetes on AWS with kops

kops helps you create, destroy, upgrade and maintain production-grade, highly available, Kubernetes clusters from the command line.

AWS (Amazon Web Services) is currently officially supported, with GCE in beta support, and VMware vSphere in alpha and other platforms planned.

Prerequisite :

  • AWS Account
  • Domain to create DNS records
  • Kubectl

Kops Installation (Linux) :

$ 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

Link: https://github.com/kubernetes/kops

AWS CLI Installation :

The primary distribution method for the AWS CLI is pip. This is a package manager for Python that provides an easy way to install, upgrade, and remove Python packages and their dependencies.

$ pip install awscli --upgrade --user

$ aws --version
aws-cli/1.16.59 Python/2.7.5 Linux/3.10.0-957.1.3.el7.x86_64 botocore/1.12.49

AWS CLI configuration :

To launch a cluster in AWS, it is required to configure aws cli with access key and secret key.

Login into AWS console and go to IAM. Create a user with programmatic access and add Administrator policy.

Download the credentials file and place under $HOME/.aws directory. Or add the credentials with “aws configure”command.

$ aws configure
AWS Access Key ID : XXXXXXXXXXXXXXXXXXXXX
AWS Secret Access Key : XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Default region name [us-east-1]: 
Default output format [json]:

S3 Bucket to store its state :

kops has the notion of a ‘state store’; a location where we store the configuration of your cluster. State is stored here not only when you first create a cluster, but also you can change the state and apply changes to a running cluster.

Goto S3 service and create a bucket.

kops-s3.PNG

Configure DNS:

If you bought a domain with AWS, then you should already have a hosted zone in Route53. If not you have to create a hosted zone with “kubernetes.your-domain.com”

kops-route53

After hosted zone created, add the NS record values in your domain DNS configuration. 

I have a domain with Godaddy and below is the DNS configuration. 

kops-domain

kops-dns

You can verify your DNS setup with below command

$ dig ns kubernetes.your-domain.com

Now, We are ready to create kubernetes cluster in AWS Cloud. 

Create a Kubernetes cluster:

Create a kubernetes cluster using kops command line flags. This command creates cloud-based resources such as networks and virtual machines.

Once the infrastructure is in place Kubernetes is installed on the virtual machines.

$ kops create cluster --name=kubernetes.yourdomain.com \
  --state=s3://kops-state-test-7569 \
  --zones=us-east-1a,us-east-1b,us-east-1c \
  --node-count=2 \
  --node-size=t2.micro \
  --master-size=t2.micro \
  --master-zones=us-east-1a \
  --dns-zone=kubernetes.s3labs.com \
  --cloud aws

If you didn’t specify “–yes” flag, it will ask to run kops update command with –yes.

$ kops update cluster kubernetes.yourdomain.com \
  --state=s3://kops-state-test-7569 --yes

When cluster creation completed, kops automatically configure for kubectl. Also, read the suggestion.

Check the nodes with kubectl get nodes

$ kubectl get nodes
NAME                           STATUS   ROLES  AGE VERSION
ip-172-20-100-182.ec2.internal Ready    node   51s v1.11.6
ip-172-20-35-29.ec2.internal   Ready    node   1m  v1.11.6
ip-172-20-45-162.ec2.internal  Ready    master 2m  v1.11.6

To delete the cluster, run kops delete command:

$ kops delete cluster kubernetes.s3labs.com \
  --state=s3://kops-state-test-7569 \
  --yes

For more info click on below link

Link: https://github.com/kubernetes/kops/blob/master/docs/cli/kops_create_cluster.md

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