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Amazon EKS

Amazon Elastic Kubernetes Service (Amazon EKS) is a fully managed Kubernetes service provided by AWS. Customize and manage the full lifecycle of Amazon EKS clusters in any region using GitOps automation and an intuitive self-service wizard based workflow.


Credentials

Ensure you have created valid cloud credentials for the controller to manage the lifecycle of Amazon EKS clusters on your behalf in your AWS account.


Automation Pipelines

The RCTL CLI can be easily embedded and integrated into your preferred platform for automation pipelines. Here is an illustrative example of a Jenkins based pipeline that uses RCTL to provision an Amazon EKS Cluster based on the provided cluster specification.

Sequence Diagram


Examples

Multiple ready to use examples of cluster specifications are maintained and provided in this Public Git Repo.


Create Cluster

Imperative

Create an EKS cluster object in the configured project in the Controller. You can optionally also specify the cluster blueprint during this step.

To create an EKS cluster, region and cloud credentials name are mandatory. If not specified, the default cluster blueprint will be used.

./rctl create cluster eks eks-cluster sample-credentials --region us-west-2

To create an EKS cluster with a custom blueprint

./rctl create cluster eks eks-cluster sample-credentials --region us-west-2 -b standard-blueprint

Declarative

You can also create an EKS cluster based on a version controlled cluster spec that you can manage in a Git repository. This enables users to develop automation for reproducible infrastructure.

./rctl create cluster eks -f cluster-spec.yml

An illustrative example of the cluster spec YAML file for EKS is shown below

kind: Cluster
metadata:
  # cluster labels
  labels:
    env: dev
    type: eks-workloads
  name: eks-cluster
  project: defaultproject
spec:
  type: eks
  blueprint: default
  cloudprovider: dev-credential # Name of the cloud credential object created on the Controller
---
apiVersion: rafay.io/v1alpha5
kind: ClusterConfig
metadata:
  name: eks-cluster
  region: us-west-1
  version: "1.18"
  tags:
    'demo': 'true'
nodeGroups:
  - name: nodegroup-1
    instanceType: t3.xlarge
    desiredCapacity: 1
    volumeType: gp3
    volumeSize: 50
    privateNetworking: true

Get Cluster Details

Once the cluster has been created, use this command to retrieve details about the cluster.

./rctl get cluster cluster-name

An example for a successfully provisioned and operational cluster is shown below.

+--------------+-----------------------------+---------+--------+-----------+----------------------------+----------+
| NAME         | CREATED AT                  | TYPE    | STATUS | BLUEPRINT | PROVISION                  | COMMENTS |
+--------------+-----------------------------+---------+--------+-----------+----------------------------+----------+
| cluster-name | 2021-02-20T00:05:10.425154Z | aws-eks | READY  | default   | CLUSTER_PROVISION_COMPLETE |          |
+--------------+-----------------------------+---------+--------+-----------+----------------------------+----------+

Node Groups

Both Managed and Self Managed node groups are supported.

Add Node Groups

You can add a new node group (Spot or Standard) to an existing EKS cluster. Here is an example YAML file to add a spot node group to an existing EKS cluster.

apiVersion: rafay.io/v1alpha5
kind: ClusterConfig
metadata:
  name: eks-cluster
  region: us-west-1

nodeGroups:
  - name: spot-ng-1
    minSize: 2
    maxSize: 4
    volumeType: gp3
    instancesDistribution:
      maxPrice: 0.030
      instanceTypes: ["t3.large","t2.large"]
      onDemandBaseCapacity: 0
      onDemandPercentageAboveBaseCapacity: 0
      spotInstancePools: 2

To add a spot node group to an existing cluster based on the config shown above.

./rctl create node-group -f eks-nodegroup.yaml

Scale Nodegroup

To Scale an existing nodegroup in a cluster

./rctl scale node-group nodegroup-name cluster-name --desired-nodes <node-count>

Drain Nodegroup

To drain a nodegroup in a cluster

./rctl drain node-group nodegroup-name cluster-name

Delete Nodegroup

To delete a nodegroup from an existing cluster

./rctl delete node-group nodegroup-name cluster-name

Delete Cluster

This will delete the EKS cluster and all associated resources in AWS.

./rctl delete cluster eks-cluster