small app to get EKS cluster info from the API and print a filled out config file for ~/.kube/config from https://docs.aws.amazon.com/eks/latest/userguide/getting-started.html

eks_config.jinja

apiVersion: v1
clusters:
- cluster:
    server: {{endpoint_url}}
    certificate-authority-data: {{cert_data}}
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: aws
  name: aws
current-context: aws
kind: Config
preferences: {}
users:
- name: aws
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      command: aws-iam-authenticator
      args:
        - "token"
        - "-i"
        - "{{cluster_name}}"
        # - "-r"
        # - "<role-arn>"
      # env:
        # - name: AWS_PROFILE
        #   value: "<aws-profile>"

make_eks_config.py

"""get the relevant data from api and print config"""

# stdlib

# 3rd party
import click
from jinja2 import Template
import boto3

# local

@click.command()
@click.option('-r', '--region', default='us-east-1', help='aws region')
@click.argument('cluster_name')
def make_eks_config(region, cluster_name):

    with open('/home/me/eks/eks_config.jinja') as fd:
        template = Template(fd.read()) 

    eks = boto3.client('eks', region_name=region)

    try:
        res = eks.describe_cluster(name=cluster_name).get('cluster')
    except Exception as e:
        click.echo(e)
        exit(1)


    url = res.get('endpoint')
    cert_data = res.get('certificateAuthority', {}).get('data')
    print(template.render(endpoint_url=url, 
                          cert_data=cert_data, 
                          cluster_name=cluster_name))

if __name__ == '__main__':
    make_eks_config()