EOT

https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/examples/complete/main.tf

 self_managed_node_groups = {
   spot = {
     instance_type = "m5.large"
     instance_market_options = {
       market_type = "spot"
     }

     pre_bootstrap_user_data = <<-EOT
       echo "foo"
       export FOO=bar
     EOT

     bootstrap_extra_args = "--kubelet-extra-args '--node-labels=node.kubernetes.io/lifecycle=spot'"

     post_bootstrap_user_data = <<-EOT
       cd /tmp
       sudo yum install -y https://s3.amazonaws.com/ec2-downloads-windows/SSMAgent/latest/linux_amd64/amazon-ssm-agent.rpm
       sudo systemctl enable amazon-ssm-agent
       sudo systemctl start amazon-ssm-agent
     EOT
   }
 }

EOF