Amazon EKS Create and Delete Cluster

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External

Internal

Creation Procedure

This procedure documents creation from the AWS Console.

Create Resources

Create a dedicated VPC and associated resources using the pre-defined CloudFormation stack as described here: https://docs.aws.amazon.com/eks/latest/userguide/getting-started-console.html.

  • Use "public and private subnets" option.
  • Do not specify an IAM role.

Write down the name of the stack, as it may be needed to delete the resources.

Also write down VpcId, SecurityGroups, SubnetId

Create the Cluster Service Role

For an explanation of what a cluster service role is see:

Cluster Service Role

Creation

https://docs.aws.amazon.com/eks/latest/userguide/service_IAM_role.html#create-service-role

IAM console → Create role → AWS Service → Select a service to view its use cases → EKS → Select your use case → EKS Cluster → Next: Permissions (by default AmazonEKSClusterPolicy is selected) → Next: Tags

Role name: 

<cluster-name>-service-role

Reuse from an Existing Cluster

Cluster → Configuration → Details → "Cluster IAM Role ARN"

Create the Cluster

Cluster Configuration

The cluster will be accessible to the IAM User that creates it without any additional configuration. Other users can be added as described in the Allowing Additional Users to Access the EKS Cluster section, after the cluster is created.

Create the cluster.

From the Console → EKS → Create Cluster

Name: ...

Cluster Service Role: the role created above, <cluster-name>-service-role.

Secrets Encryption

Disabled.

Tags

Optional.

Next.

Networking

VPC

Subnets (all existing subnets in the VPC are preselected)


If you intend to deploy LoadBalancer services that should be available externally, you must select at least one public subnet, otherwise you will get this upon LoadBalancer deployment: "Error syncing load balancer: failed to ensure load balancer: could not find any suitable subnets for creating the ELB"

Security groups

The security group provided here are additional security groups.

The value can be left empty. Can it be updated later?

The cluster security group is created automatically during the cluster creation process. If nodes inside the VPC need access to the API server, add an inbound rule for HTTPS and the VPC CIDR block.

More concepts around EKS security groups and more details are available here:

EKS Security Groups

Cluster endpoint access

This configures access to the Kubernetes API server endpoint.

Public and private.

If the endpoint access is public, sources to the public endpoint can be filtered by CIDR block.

Networking add-ons

Amazon VPC CNI

v1.7.5-eksbuild.1

Next.

Configure logging

Control Plane Logging

All disabled.

Next.

Create.

Test Access

At this point there are no nodes, but the cluster should be available. You can set up a "creator" context as described here, using the same IAM User identity (not a role): Connect to an EKS Cluster with kubectl.

To set up access with an IAM role, worker nodes must be added to the cluster, otherwise the aws-auth ConfigMap is not created.

Provision Compute Nodes

Create a Compute IAM Role

Create a "compute" Role. Go to IAM, create role and:

AWS Services → EC2 → EC2 → Next: Permissions → Add AmazonEKSWorkerNodePolicy, AmazonEKS_CNI_Policy, AmazonEC2ContainerRegistryReadOnly policies)

Name: 

<cluster-name>-compute-role

Create Node Group

Select the EKS cluster, go to the Configuration tab, then Compute tab.

Add Node Group.

Name <cluster-name>-node-group[-postfix] (postfix could be memory "-128" or anything relevant). If only one node group is sufficient, call it <cluster-name>-default-node-group.

Node IAM role - the one created previously: <cluster-name>-compute-role.

Kubernetes labels. You can add labels now so pods can be scheduled based on them. Example:

Key: node-group, Value: <cluster-name>-node-group-128.

Next.

AMI type: Amazon Linux 2

Capacity type: On-Demand

Instance type: t3.2xlarge

Disk size: 20. If planning to use if for large images, etc. increase this. 60 GB.

Minimus size: 3 Maximu size: 3 Desired size: 3

Next

Select only the private subnets. Even if we will deploy public load balancers, they will work fine as long as the cluster was created with at least one public subnet.

SSH Key Pair - this gives access to the nodes.

Allow remote access from: All

Create. 

kubectl get nodes

Other matters:

  • If you plan to use NFS, make sure the security groups allow NFS inbound.

Scale-Up Node Group

Amazon EKS Operations | Scale Up Node Group

Configure Access

Allowing Additional Users to Access the Cluster

Deletion Procedure

Delete Nodes and Cluster

Delete Nodes

Go to the cluster → Compute → Node Groups → Select → Delete.

Deleting the Node Group automatically terminates and deletes the instances.

Delete the Cluster

Delete the cluster.

Delete the Associated Resources

Remove the associated resources (subnets, VPC, etc.) by running Delete on the CloudFormation stack used to create resources.

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