Separate file system for build an CIS level 1 compliant AMI with Packer

We want to do something that should be pretty simple with packer build a cloud ami which as several filesystem. Right now we are building aws ami with one disk and a large / filesystem

To be secure compliant CIS level 1 (CIS Critical Security Controls) We need to have a least a separate file System for /tmp /home and /var/tmp.

In order to do so, we can select a larger disk and provide a lvm layout which can be done in a kickstart file or aws EC Image builder.

What would be the simplest way to achieve this with packer ? We have seen a presentation done at Hashiconf 2016 (OS Hardening and Packer - YouTube)

Could you point us the best path to follow ? From the doc I don’t see an easy solution using the chroot (Amazon chroot - Builders | Packer by HashiCorp)
Maybe an easy solution, would be to attach a second drive to the image and put those filesystem on the second drive using a shell script ?

Any pointer will be welcome.

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Hello Packer team,

We have the same needs in our project and we would love to hear your best practice recommendation as of the best way to achieve this.

Best.

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