using fallocate to setup swapfile is risky

[gc-ss]

I see fallocate being used to setup swapfile:

https://github.com/futurice/terraform-examples/blob/master/aws/aws_ec2_ebs_docker_host/provision-swap.sh#L16

This is not recommended.

EG: https://askubuntu.com/questions/1017309/fallocate-vs-dd-for-swapfile