hibernation-setup-tool - sets up a VM for hibernation

hibernation-setup-tool

hibernation-setup-tool is a tool that sets up a swap file suitable for hibernation, and sets up the system to enable proper resuming.

It accomplishes that by creating a swap file in the root directory that's slightly larger than the total amount of RAM available for the VM, ensuring it has no holes and isn't fragmented, and setting up parameters for the currently-running kernel (so the VM can be hibernated as soon as the set up is complete), and for next boots (so that the VM can be resumed).

On Hyper-V virtual machines, it'll also ensure that proper udev rules are set in place so that the machine can hibernate when receiving a command from the host. In addition, it'll install systemd hooks to track hibernation success, failures, and cold-boot scenarios, and store them in the system log.

It currently only fully supports distributions with GRUB2 as the bootloader (e.g. those with /etc/default/grub as part of its configuration file), and those using initramfs-tools (e.g. Debian and Ubuntu). Use in systems where either of these aren't used is possible, however the tool won't be able to adjust the system in such a way that it'll resume from hibernation.

Installation can be performed either manually, by using the provided Makefile (e.g. by issuing make to build and make install with superuser privileges to install files in the correct locations), or by installing a .deb package. To build the .deb package, one can use the provided build.sh script in the debian-packaging branch of this repository, which, in a system where tools to build Debian packages have been installed, will perform all necessary steps to output a file that can be installed via dpkg.

No command-line parameters exist. The tool is fully automatic, and will exit when set up has been completed. It can be safely executed on every boot, without impacting boot time.

The tool will return 0 on success, and 1 on failure.

Written by Leandro Pereira.

Submit bug reports online.

Full source code is available.

This program requires superuser privileges to execute.

Pull requests improving the tool are greatly appreciated. Please refer to the CONTRIBUTING.md file located in the source repository for more information, including a link to the Microsoft Open Source Code of Conduct document.

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