Integration

CRIU is not so easy to be used as a standalone tool -- it works best integrated into other software. This page lists such software and provides details about the current status.

Container platforms

Virtuozzo/OpenVZ

Status: ready

As of Virtuozzo/OpenVZ 7, CRIU is fully integrated and supported. Older OpenVZ releases used in-kernel checkpoint/restore functionality, now superseded by CRIU.

• OpenVZ
• Virtuozzo

LXC/LXD

Status: ready

• Project homepage
• The tools version 1.1.0 fully supports CRIU to C/R LXC containers
• lxc-checkpoint man page

See also: LXC

Docker

Status: ready

• Project homepage
• Merged into libcontainer/runc
• Merged into Docker itself
• Preparations efforts done by Saied Kazemi

See also: Docker C/R

Podman

Status: ready

• Project homepage
• Blog entry about adding the support

Tools and utilities

The file utility

Status: ready

• Starting from v1.6 new images (v1.1) will be generated
• File utility starting from 5.23 will support these

Screen/TMUX

Status: stalled

• Jerome did this some time ago

See also: Screen

Shell

Status: not started

It would be nice to have bash (or other shell) to launch criu with --restore-sibling option and get new kid processes from it. Right now we workaround it with "shell jobs".

See also: Shell jobs

Other

OpenJDK

Status: started

The CRaC (Coordinated Restore at Checkpoint) Project researches coordination of Java programs with mechanisms to checkpoint (make an image of, snapshot) a Java instance while it is executing. Restoring from the image could be a solution to some of the problems with the start-up and warm-up times. The primary aim of the Project is to develop a new standard mechanism-agnostic API to notify Java programs about the checkpoint and restore events. Other research activities will include, but will not be limited to, integration with existing checkpoint/restore mechanisms and development of new ones, changes to JVM and JDK to make images smaller and ensure they are correct.

• OpenJDK: CRaC Project
• CRaC Wiki
• CRaC Repository

OpenMPI

Status: stalled

• Adrian Reber did first version of patches

Subgraph OS

Status: not started

• Subgraph OS is a desktop operation system uses containers for users applications.

SLURM workload manager

Status: ready

• Project homepage here
• Integration code on the github

Wayland/Weston

Status: stalled

• Ruslan Kuprieiev plans to patch Weston to let CRIU C/R graphical apps

See also: X applications

Systemd

Status: not started

Adrian suggested that migrating processes from one system to another works, depending on the process, pretty good. Migrating a process under systemd's control might be possible by just killing the process on the source side but it cannot become a child process of systemd on the destination of the migration without systemd knowing how to restore a process and thus making it a child process of systemd (--restore-sibling).