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<big>Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux in userspace.
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<big>Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux.
  
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Checkpoint/Restore In Userspace, or CRIU (pronounced kree-oo, IPA: /krɪʊ/, Russian: криу), is a software tool for Linux operating system. Using this tool, you can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. You can then use the files to restore and run the application from the point it was frozen at. The distinctive feature of the CRIU project is that it is mainly implemented in user space.
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Checkpoint/Restore In Userspace, or CRIU (pronounced kree-oo, IPA: /krɪʊ/, Russian: криу), is a Linux software. It can freeze a running container (or an individual application) and checkpoint its state to disk. The data saved can be used to restore the application and run it exactly as it was during the time of the freeze. Using this functionality, application or container live migration, snapshots, remote debugging, and [[usage scenarios|many other things]] are now possible.
  
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CRIU started as a project of Virtuozzo, and grew with the tremendous help from the [[community]]. It is currently used by (integrated into) OpenVZ, [[LXC]]/LXD, [[Docker]], [[Podman]], and [[Integration|other software]], and [[packages|packaged for many Linux distributions]].
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[https://criu.org https://static.openvz.org/criu_88x31.gif] is a project of [https://openvz.org https://static.openvz.org/openvz_88x31.gif] and is supported by [https://www.odin.com https://static.openvz.org/odin_88x31.png], [https://www.acronis.com https://static.openvz.org/acronis_88x31.png], [https://mos.ru https://static.openvz.org/moscowgov_small.png] and [https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FZ8W4VU9AS2XL your donations].</div></big>
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== Using ==
 
== Using ==
  
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;[[CLI]], [[RPC]] and [[C API]]
 
;[[CLI]], [[RPC]] and [[C API]]
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: Three ways to start using the C/R functionality
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: Three ways to start using the C/R functionality.  [[:Category:API|More info]] about APIs.
  
 
;[[Usage scenarios]]
 
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: Collection of real world examples of how to use CRIU. Some are complex, some are not. HOW TO dump a [[simple loop]] might be the best one to start with. Also a set of [[asciinema]] records for real-life examples.
 
: Collection of real world examples of how to use CRIU. Some are complex, some are not. HOW TO dump a [[simple loop]] might be the best one to start with. Also a set of [[asciinema]] records for real-life examples.
  
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;[[:Category:API]]
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;[https://www.criu.org/index.php?title=FAQ FAQ] & [[When C/R fails]]
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: Collection of pages about CRIU's API.
 
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: A sort of troubleshooting guide
 
: A sort of troubleshooting guide
  
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== Developing ==
 
== Developing ==
 
If you're interested in CRIU development, please subscribe to the criu mailing list: https://lists.openvz.org/mailman/listinfo/criu
 
If you're interested in CRIU development, please subscribe to the criu mailing list: https://lists.openvz.org/mailman/listinfo/criu
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: What to keep in mind when writing new code
 
: What to keep in mind when writing new code
  
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;[https://criu.org/cov/ Code coverage results]
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;[https://coveralls.io/github/checkpoint-restore/criu Code coverage results]
 
: Shows how zdtm run covers the criu code paths
 
: Shows how zdtm run covers the criu code paths
  
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== [[:Category:Under the hood|Under the hood]] ==
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== Under the hood ==
 
* [[Checkpoint/Restore]]
 
* [[Checkpoint/Restore]]
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* [[:Category:Under the hood]]
 
* [[:Category:Network]]
 
* [[:Category:Network]]
 
* [[:Category:Files]]
 
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== External links ==
 
== External links ==
 
{{:Articles}}
 
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== Audio ==
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== Misc ==
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* [[Academic Research]]
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* [[Podcasts]] and other audio/video interviews
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== Other ==
 
 
* Project [[history]]
 
* Project [[history]]
 
* [[Logo]] description
 
* [[Logo]] description
 
* [[Events]]
 
* [[Events]]
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* Join the [[CRIU acronym fun]]
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Latest revision as of 14:12, 2 October 2024

Download
Tarball: criu-4.0.tar.gz
Version: 4.0 "CRIUDA"
Released: 20 Sep 2024
GIT tag: v4.0
Installation • Usage
Releases
4.0.c.jpg

Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux.

Checkpoint/Restore In Userspace, or CRIU (pronounced kree-oo, IPA: /krɪʊ/, Russian: криу), is a Linux software. It can freeze a running container (or an individual application) and checkpoint its state to disk. The data saved can be used to restore the application and run it exactly as it was during the time of the freeze. Using this functionality, application or container live migration, snapshots, remote debugging, and many other things are now possible.

CRIU started as a project of Virtuozzo, and grew with the tremendous help from the community. It is currently used by (integrated into) OpenVZ, LXC/LXD, Docker, Podman, and other software, and packaged for many Linux distributions.


Events
Feed-icon.svg RSS • Atom


LinuxDays 2024

Linux-days-cz.svg

13 Oct 2024, On the Edge of Tomorrow: Checkpoint/Restore in Containers


Kubernetes Community Days Austria

Kcd-austria.svg

09 Oct 2024, Forensic container checkpointing and analysis


Linux Plumbers Conference 2024

Linuxplumbers.png

18-20 Sep 2024, Containers and Checkpoint/Restore Microconference 

Other talks:
* Userspace memory persistence over kexec
* Checkpoint/Restore In eBPF (CRIB)



More events… – Past events…

Using

Getting packages for your distribution
Or try manual installation to have CRIU on your system

CLI, RPC and C API
Three ways to start using the C/R functionality. More info about APIs.
Usage scenarios
Ideas how criu can be used (some are crazy indeed)
Category:HOWTO
Collection of real world examples of how to use CRIU. Some are complex, some are not. HOW TO dump a simple loop might be the best one to start with. Also a set of asciinema records for real-life examples.
FAQ & When C/R fails
A sort of troubleshooting guide
What can change after C/R
CRIU cannot (yet) save and restore every single bit of tasks' state. This page describes what bits visible through standard kernel API are such.
What cannot be checkpointed
What an application could do to make CRIU refuse to dump it.
Contacts
Ways to communicate with CRIU community

Developing

If you're interested in CRIU development, please subscribe to the criu mailing list: https://lists.openvz.org/mailman/listinfo/criu

Images
Description of image files format
Plugins
CRIU can call plugins provided by people
Upstream kernel commits
Mainline kernel commits tracker
Recent commits
CRIU tool repository commits
Manpages
Kernel's manpages commits tracker
ZDTM Test Suite
Zero downtime test suite
TODO
Current TODO list
User namespace
Implementing user namespace support
Postulates
What to keep in mind when writing new code
Code coverage results
Shows how zdtm run covers the criu code paths
How to submit patches


Under the hood

External links

More external articles...

Misc

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