Map an IAM User to K8s

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Next, we’ll define a k8s user called rbac-user, and map to its IAM user counterpart. Run the following to get the existing ConfigMap and save into a file called aws-auth.yaml:

kubectl get configmap -n kube-system aws-auth -o yaml | grep -v "creationTimestamp\|resourceVersion\|selfLink\|uid" | sed '/^  annotations:/,+2 d' > aws-auth.yaml

Next append the rbac-user mapping to the existing configMap

cat << EoF >> aws-auth.yaml
  mapUsers: |
    - userarn: arn:aws:iam::${ACCOUNT_ID}:user/rbac-user
      username: rbac-user

Some of the values may be dynamically populated when the file is created. To verify everything populated and was created correctly, run the following:

cat aws-auth.yaml

And the output should reflect that rolearn and userarn populated, similar to:

apiVersion: v1
kind: ConfigMap
  name: aws-auth
  namespace: kube-system
  mapUsers: |
    - userarn: arn:aws:iam::123456789:user/rbac-user
      username: rbac-user

Next, apply the ConfigMap to apply this mapping to the system:

kubectl apply -f aws-auth.yaml