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<big>Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux in userspace.
<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 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.
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 ==
;[[CLI]], [[RPC]] and [[C API]]
;[[CLI]], [[RPC]] and [[C API]]
: Three ways to start using the C/R functionality
: Three ways to start using the C/R functionality. [[:Category:API|More info]] about APIs.
;[[Usage scenarios]]
;[[Usage scenarios]]
: 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.
;[[:Category:API]]
;[[FAQ]] & [[When C/R fails]]
: 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
: What to keep in mind when writing new code
: What to keep in mind when writing new code
;[https://criu.org/cov/ Code coverage results]
;[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]] ==
== Under the hood ==
* [[Checkpoint/Restore]]
* [[Checkpoint/Restore]]
* [[:Category:Under the hood]]
* [[:Category:Network]]
* [[:Category:Network]]
* [[:Category:Files]]
* [[:Category:Files]]
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== External links ==
== External links ==
{{:Articles}}
{{:Articles}}
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== Audio ==
== Misc ==
* [[Podcasts]] and other audio/video interviews
* Project [[history]]
* Project [[history]]
* [[Logo]] description
* [[Logo]] description
* [[Events]]
* [[Events]]
* Join the [[CRIU acronym fun]]
* [[CRIU acronym fun]]
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