How do I create an Amazon EKS cluster and node groups that don't require access to the internet?

Last updated: 2020-07-10

I want to create an Amazon Elastic Kubernetes Service (Amazon EKS) cluster and node groups with PrivateOnly networking. I don't want to use an internet gateway or network address translation (NAT) gateway.

Short description

You can use AWS PrivateLink to create an Amazon EKS cluster and its node group without using a route to the internet.

Resolution

Create an Amazon Virtual Private Cloud (Amazon VPC) for your Amazon EKS cluster

1.    Create an AWS CloudFormation stack using the following template:

https://amazon-eks.s3.us-west-2.amazonaws.com/cloudformation/2020-06-10/amazon-eks-fully-private-vpc.yaml

The stack creates a VPC with three PrivateOnly subnets and VPC endpoints for the required services. A PrivateOnly subnet has a route table with a default local route and no access to the internet.

Important: The AWS CloudFormation template creates the VPC endpoints with a full access policy, but you can further restrict the policy based on your requirements.

Tip: To review all the VPC endpoints after the stack is created, open the Amazon VPC console, and then choose Endpoints from the navigation pane.

2.    Open the AWS CloudFormation console.

3.    In the navigation pane, choose Stacks.

4.    Choose your stack, and then choose the Outputs tab. This tab has information on your subnets that you will need later, including the VPC ID.

Configure the Amazon EKS cluster config file, and then create the cluster and node group

1.    In the following config file, update the AWS Region and three PrivateOnly subnets that you created in the Create a VPC for your Amazon EKS cluster section. You can also modify other attributes, or add more attributes, in the config file. For example, you can update name, instanceType, or desiredCapacity.

Example config file:

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: prod
  region: us-east-1   
nodeGroups:
  - name: ng-1
    instanceType: m5.xlarge
    desiredCapacity: 2
    privateNetworking: true
vpc:
  subnets:
    private:
      us-east-1a:
        id: "subnet-0111111111111111"
      us-east-1b:
        id: "subnet-0222222222222222"
      us-east-1c:
        id: "subnet-0333333333333333"
  clusterEndpoints:
    publicAccess:  true
    privateAccess: true

In the preceding config file, for nodeGroups, set privateNetworking to true. For clusterEndpoints, set privateAccess to true.

Important: The eksctl tool isn't required for the resolution. You can use other tools or the Amazon EKS console to create the Amazon EKS cluster and nodes. If you use other tools or the console to create a worker node, you must pass the CA certificate and API server endpoint of the Amazon EKS cluster as arguments, while calling the bootstrap script for the worker node.

2.    To create an Amazon EKS cluster and node group based on the updated config file in step 1, run the following command:

$ eksctl create cluster -f config.yaml

The preceding command creates an Amazon EKS cluster and node group in a PrivateOnly network using AWS PrivateLink with no access to internet. The process takes approximately 30 minutes.

The output is similar to the following:

Output
[ℹ]  eksctl version 0.21.0
[ℹ]  using region us-east-1
[✔]  using existing VPC (vpc-01234567) and subnets (private:[subnet-01111111111111111 subnet-02222222222222222 subnet-03333333333333333] public:[])
[!]  custom VPC/subnets will be used; if resulting cluster doesn't function as expected, make sure to review the configuration of VPC/subnets
[ℹ]  nodegroup "ng-1" will use "ami-0ee0652ac0722f0e3" [AmazonLinux2/1.16]
[ℹ]  using Kubernetes version 1.16
[ℹ]  creating EKS cluster "prod" in "us-east-1" region with un-managed nodes
[ℹ]  1 nodegroup (ng-1) was included (based on the include/exclude rules)
[ℹ]  will create a CloudFormation stack for cluster itself and 1 nodegroup stack(s)
[ℹ]  will create a CloudFormation stack for cluster itself and 0 managed nodegroup stack(s)
[ℹ]  if you encounter any issues, check CloudFormation console or try 'eksctl utils describe-stacks --region=us-east-1 --cluster=prod'
[ℹ]  CloudWatch logging will not be enabled for cluster "prod" in "us-east-1"
[ℹ]  you can enable it with 'eksctl utils update-cluster-logging --region=us-east-1 --cluster=prod'
[ℹ]  Kubernetes API endpoint access will use provided values {publicAccess=true, privateAccess=true} for cluster "prod" in "us-east-1"
[ℹ]  2 sequential tasks: { create cluster control plane "prod", 2 sequential sub-tasks: { update cluster VPC endpoint access configuration, create nodegroup "ng-1" } }
[ℹ]  building cluster stack "eksctl-prod-cluster"
[ℹ]  deploying stack "eksctl-prod-cluster"
[ℹ]  building nodegroup stack "eksctl-prod-nodegroup-ng-1"
[ℹ]  --nodes-min=2 was set automatically for nodegroup ng-1
[ℹ]  --nodes-max=2 was set automatically for nodegroup ng-1
[ℹ]  deploying stack "eksctl-prod-nodegroup-ng-1"
[✔]  all EKS cluster resources for "prod" have been created
[✔]  saved kubeconfig as "/Users/garpunee/.kube/config"
[ℹ]  adding identity "arn:aws:iam::444444444444:role/eksctl-prod-nodegroup-ng-1-NodeInstanceRole-H37FWX4H84GH" to auth ConfigMap
[ℹ]  nodegroup "ng-1" has 0 node(s)
[ℹ]  waiting for at least 2 node(s) to become ready in "ng-1"
[ℹ]  nodegroup "ng-1" has 2 node(s)
[ℹ]  node "ip-192-168-254-139.ec2.internal" is ready
[ℹ]  node "ip-192-168-60-191.ec2.internal" is ready
[ℹ]  kubectl command should work with "/Users/<>/.kube/config", try 'kubectl get nodes'
[✔]  EKS cluster "prod" in "us-east-1" region is ready

Note: You can also create managed or unmanaged node groups within your cluster using either the console or eksctl. For more information on eksctl, see Managing nodegroups on the Weaveworks website.


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