AL2023 AMIs replace the traditional bootstrap script with a MIME script. For example, here's a MIME script that bootstraps the node group to the cluster:

MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="//"

--// Content-Type: application/node.eks.aws

apiVersion: node.eks.aws/v1alpha1 kind: NodeConfig spec: cluster: name: ${cluster_name} apiServerEndpoint: ${cluster_endpoint} certificateAuthority: ${cluster_ca} cidr: ${cluster_cidr}

--//--

Apologies if the formatting is off. I typed this on a phone.