Hibernation using full disk encryption
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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:
cryptsetup luksOpen /dev/<swap> crypt
swapon -a
s2disk -P encrypt=N --resume_device=/dev/mapper/crypt
To resume: Make sure the initramfs has a /dev/snapshot. It can be created using
mknod /dev/snapshot c 10 231
If there's no snapshot device, resume will hang with message:
resume: libgcrypt version x.y.zOpen the encrypted swap and resume:
cryptsetup luksOpen /dev/<swap> crypt
resume --resume_device=/dev/mapper/crypt
On Gentoo these executables are installed using
emerge -v sys-power/suspend
The resume utility is automatically static-compiled.