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

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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[http://criu.org http://static.openvz.org/criu_88x31.gif] is a project of [https://openvz.org http://static.openvz.org/openvz_88x31.gif] and is sponsored and supported by [http://www.parallels.com http://static.openvz.org/parallels_88x31.gif]</big></div>
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== Using ==

;[[Installation]]
: What to do to have CRIU on your system

;[[Usage|CLI]] and [[RPC]]
: Two ways to start using the C/R functionality

;[[Usage scenarios]]
: Ideas how criu can be used (some are crazy indeed)

;[[What software is supported]]
: Describes TODO list in higher level terms

;[[: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.

;[[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]]
: This article describes what application can do to make CRIU refuse to dump it. It can be used as some sort of troubleshooting guide.

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

;[[Images]]
: Description of image files format

;[[Commits]]
: Mainline kernel commits tracker

;[[Manpages]]
: Kernel's manpages commits tracker

;[[ZDTM Test Suite]]
: Zero downtime test suite

;[[Todo|TODO]]
: Current TODO list

;[[Postulates]]
: What to keep in mind when writing new code

;[http://criu.org/cov/ Code coverage results]
: Shows how zdtm run covers the criu code paths

;[[How to submit patches]]
:

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== Under the hood ==
* [[Sockets]]
* [[Memory dumping and restoring]]
* [[Checkpoint/Restore]]
* [[TCP connection]]
* [[Files]]
* [[Pending signals]]
* [[Stages of restoring]]
* [[COW]]
* [[Code blobs]]
* [[Comparison to other CR projects]]
* [[Memory changes tracking]]
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== External links ==
{{:Articles}}
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== Other ==
* Project [[history]]
* [[Logo]] description
* [[Events]]
* Join the [[CRIU acronym fun]]
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