EIP
UserData
HA
#!/bin/bash -xe
INSTANCE_ID=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)
aws ec2 disassociate-address --association-id ${OpenPVNEIP.AllocationId} --region ${AWS::Region} || true
aws ec2 associate-address --instance-id "${!INSTANCE_ID}" --allocation-id ${OpenPVNEIP.AllocationId} --region ${AWS::Region}