View source for Hibernation using full disk encryption

A simple example with just an encrypted swap partition, this could also be part of LVM if you're careful to run everything LVM related in read-only.

To Hibernate:
<source lang="sh">
cryptsetup luksOpen /dev/<swap> crypt
swapon -a
s2disk -P encrypt=N --resume_device=/dev/mapper/crypt
</source>

To resume:
Make sure the initramfs has a /dev/snapshot. It can be created using
<source lang="sh">
mknod /dev/snapshot c 10 231
</source>

If there's no snapshot device, resume will hang with message:
<source>
resume: libgcrypt version x.y.z
</source>

Open the encrypted swap and resume:
<source lang="sh">
cryptsetup luksOpen /dev/<swap> crypt
resume --resume_device=/dev/mapper/crypt
</source>