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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.
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.
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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== Using ==
== Using ==
;[[Releases]]
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;Getting [[packages]] for your distribution
: Or try manual [[installation]] to have CRIU on your system
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;[[CR_tools | CR tools]]
;[[CLI]], [[RPC]] and [[C API]]
: Main checkpoint/restore utility description (sort of HOWTO)
: Three ways to start using the C/R functionality. [[:Category:API|More info]] about APIs.
;[[Usage scenarios]]
;[[Usage scenarios]]
: Ideas how crtools can be used (some are crazy indeed)
: 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.
;[[What software is supported]]
;[[FAQ]] & [[When C/R fails]]
: Describes TODO list in higher level terms
: 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
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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
;[[Images]]
;[[Images]]
: Description of image files format
: Description of image files format
;[[Commits | Commits]]
;[[Plugins]]
: CRIU can call plugins provided by people
;[[Upstream kernel commits]]
: Mainline kernel commits tracker
: Mainline kernel commits tracker
;[[ZDTM_Test_Suite | ZDTM]]
;[[Recent commits]]
: CRIU tool repository commits
;[[Manpages]]
: Kernel's manpages commits tracker
;[[ZDTM Test Suite]]
: Zero downtime test suite
: Zero downtime test suite
;[[Todo | TODO]]
;[[Todo|TODO]]
: Current TODO list
: Current TODO list
;[[User namespace]]
: Implementing user namespace support
;[[Postulates]]
: What to keep in mind when writing new code
;[https://coveralls.io/github/checkpoint-restore/criu Code coverage results]
: Shows how zdtm run covers the criu code paths
;[[How to submit patches]]
:
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== Under the hood ==
== Under the hood ==
* [[Checkpoint/Restore]]
* [[:Category:Under the hood]]
* [[:Category:Network]]
* [[:Category:Files]]
* [[:Category:Memory]]
* [[Pending signals]]
* [[Stages of restoring]]
* [[Code blobs]]
* [[Comparison to other CR projects]]
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Articles about how things are done in crtools
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== External links ==
{{:Articles}}
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* [[Sockets]]
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* [[Memory dumping and restoring]]
== Misc ==
* [[Checkpoint/Restore]]
* [[Podcasts]] and other audio/video interviews
* [[TCP connection]]
* Project [[history]]
* [[Porting crtools to new kernel releases]]
* [[Logo]] description
* [[Events]]
* [[CRIU acronym fun]]
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