AWS- EKS Chapter-1

ABHISHEK KUMAR

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Jun 21, 2022

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Create, Delete -> EKS Cluster & Node Groups

Step-01: Create EKS Cluster using eksctl

• It will take 15 to 20 minutes to create the Cluster Control Plane

# Create Cluster
eksctl create cluster --name=eksdemo1 \
                      --region=us-east-1 \
                      --zones=us-east-1a,us-east-1b \
                      --without-nodegroup # Get List of clusters
eksctl get cluster

Step-02: Create & Associate IAM OIDC Provider for our EKS Cluster

• To enable and use AWS IAM roles for Kubernetes service accounts on our EKS cluster, we must create & associate OIDC identity providers.
• To do so using eksctl we can use the below command.
• Use the latest eksctl version (as of today the latest version is 0.21.0)

# Template
eksctl utils associate-iam-oidc-provider \
    --region region-code \
    --cluster <cluter-name> \
    --approve# Replace with region & cluster name
eksctl utils associate-iam-oidc-provider \
    --region us-east-1 \
    --cluster eksdemo1 \
    --approve

Step-03: Create EC2 Keypair

• Create a new EC2 Keypair with the name as kube-demo
• This keypair we will use when creating the EKS NodeGroup.
• This will help us to log in to the EKS Worker Nodes using Terminal.

Step-04: Create Node Group with additional Add-Ons in Public Subnets

• These add-ons will automatically create the respective IAM policies for us within our Node Group role.

# Create Public Node Group   
eksctl create nodegroup --cluster=eksdemo1 \
                       --region=us-east-1 \
                       --name=eksdemo1-ng-public1 \
                       --node-type=t3.medium \
                       --nodes=2 \
                       --nodes-min=2 \
                       --nodes-max=4 \
                       --node-volume-size=20 \
                       --ssh-access \
                       --ssh-public-key=kube-demo \
                       --managed \
                       --asg-access \
                       --external-dns-access \
                       --full-ecr-access \
                       --appmesh-access \
                       --alb-ingress-access

Step-05: Verify Cluster & Nodes

Verify NodeGroup subnets to confirm EC2 Instances are in Public Subnet

• Verify the node group subnet to ensure it created in public subnets
• Go to Services -> EKS -> eksdemo -> eksdemo1-ng1-public
• Click on the Associated subnet in the Details tab
• Click on Route Table Tab.
• We should see that internet route via Internet Gateway (0.0.0.0/0 -> igw-xxxxxxxx)

Verify Cluster, NodeGroup in EKS Management Console

• Go to Services -> Elastic Kubernetes Service -> eksdemo1

List Worker Nodes

# List EKS clusters
eksctl get cluster# List NodeGroups in a cluster
eksctl get nodegroup --cluster=<clusterName># List Nodes in current kubernetes cluster
kubectl get nodes -o wide# Our kubectl context should be automatically changed to new cluster
kubectl config view --minify

Verify Worker Node IAM Role and list of Policies

• Go to Services -> EC2 -> Worker Nodes
• Click on IAM Role associated with EC2 Worker Nodes

Verify Security Group Associated to Worker Nodes

• Go to Services -> EC2 -> Worker Nodes
• Click on Security Groups associated with EC2 Instance which contains remote in the name.

Verify CloudFormation Stacks

• Verify Control Plane Stack & Events
• Verify NodeGroup Stack & Events

Delete EKS Cluster & Node Groups

Step-05: Delete Node Group

• We can delete a node group separately using below eksctl delete nodegroup

# List EKS Clusters
eksctl get clusters# Capture Node Group name
eksctl get nodegroup --cluster=<clusterName>
eksctl get nodegroup --cluster=eksdemo1# Delete Node Group
eksctl delete nodegroup --cluster=<clusterName> --name=<nodegroupName>
eksctl delete nodegroup --cluster=eksdemo1 --name=eksdemo1-ng-public1

Step-06: Delete Cluster

• We can delete clusters using eksctl delete cluster

# Delete Cluster
eksctl delete cluster <clusterName>
eksctl delete cluster eksdemo1