Cleans up terminated nodes from Chef server.. run it as cron on a server with both AWS access and Chef access, with knife installed.

chef_cleanup.sh

#!/bin/bash
# Scan for terminated nodes on AWS and remove from Chef

cleanupNodes() {

# get nodes that are terminated via aws-cli
terminated_nodes=$(aws ec2 describe-instances --region=us-east-1 --filters Name=instance-state-name,Values=terminated | grep "InstanceId" | awk -F ":" '{print $2}' | awk -F '"' '{print $2}')

for node in $terminated_nodes;
 do
 knife client delete ${node} -y && knife node delete ${node} -y
 done
}

#main
cleanupNodes()