AWS Fargate on EKS

Overview

Fargate provides serverless compute for containers - no need to manage underlying EC2 instances.

Create Fargate Profile

eksctl create fargateprofile \
  --cluster my-cluster \
  --name default \
  --namespace default \
  --labels role=web

Fargate Profile Configuration

# fargate-profile.yaml
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: my-cluster
  region: us-west-2
fargateProfiles:
  - name: default
    selectors:
      - namespace: default
        labels:
          env: production
      - namespace: kube-system

Update /etc/eksctl.yaml

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: my-cluster
  region: us-west-2
iam:
  withOIDC: true
fargateProfiles:
  - name: default
    selectors:
      - namespace: default

Considerations

• Pods get ENI in VPC (security groups apply)
• No SSH access to nodes
• No DaemonSets on Fargate
• EBS volumes not supported
• Longer pod startup time vs EC2

References

• EKS Fargate
• EKS Workshop - Fargate
• fargate-vs-ec2 - Detailed comparison