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## CRIU -- A project to implement checkpoint/restore functionality for Linux ## CRIU -- A project to implement checkpoint/restore functionality for Linux
CRIU (stands for Checkpoint and Restore in Userspace) is an utility to checkpoint/restore Linux tasks. CRIU (stands for Checkpoint and Restore in Userspace) is a utility to checkpoint/restore Linux tasks.
Using this tool, you can freeze a running application (or part of it) and checkpoint 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 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 application from the point it was frozen at. The distinctive feature of the CRIU
project is that it is mainly implemented in user space. There are some more projects project is that it is mainly implemented in user space. There are some more projects
doing C/R for Linux, and so far CRIU [appears to be](https://criu.org/Comparison_to_other_CR_projects) doing C/R for Linux, and so far CRIU [appears to be](https://criu.org/Comparison_to_other_CR_projects)
the most feature-reach and up-to-date with the kernel. the most feature-rich and up-to-date with the kernel.
The project [started](https://criu.org/History) as the way to do live migration for OpenVZ The project [started](https://criu.org/History) as the way to do live migration for OpenVZ
Linux containers, but later grew to more sophisticated and flexible tool. It is currently Linux containers, but later grew to more sophisticated and flexible tool. It is currently
@@ -36,9 +36,9 @@ injection and libsoccr for TCP connections checkpoint-restore.
True [live migration](https://criu.org/Live_migration) using CRIU is possible, but doing True [live migration](https://criu.org/Live_migration) using CRIU is possible, but doing
all the steps by hands might be complicated. The [phaul sub-project](https://criu.org/P.Haul) all the steps by hands might be complicated. The [phaul sub-project](https://criu.org/P.Haul)
provides a Go library that incapsulates most of the complexity. provides a Go library that encapsulates most of the complexity.
### Parasite code ijection ### Parasite code injection
In order to get state of the running process CRIU needs to make this process execute In order to get state of the running process CRIU needs to make this process execute
some code, that would fetch the required information. To make this happen without some code, that would fetch the required information. To make this happen without
@@ -47,13 +47,13 @@ technique, which is also available as a standalone library called [libcompel](ht
### TCP sockets checkpoint-restore ### TCP sockets checkpoint-restore
One of the CRIu features is the ability to save and restore state of a TCP socket One of the CRIU features is the ability to save and restore state of a TCP socket
without breaking the connection. This functionality is considered to be useful by without breaking the connection. This functionality is considered to be useful by
tiself, and we have it available as the [libsoccr library](https://criu.org/Libsoccr). itself, and we have it available as the [libsoccr library](https://criu.org/Libsoccr).
## How to contribute ## How to contribute
CRIU project is (almost) the never ending story, because we have to always keep-up with the CRIU project is (almost) the never-ending story, because we have to always keep up with the
Linux kernel supporting checkpoint and restore for all the features it provides. Thus we're Linux kernel supporting checkpoint and restore for all the features it provides. Thus we're
looking for contributors of all kinds -- feedback, bug reports, testing, coding, writing, etc. looking for contributors of all kinds -- feedback, bug reports, testing, coding, writing, etc.
Here are some useful hints to get involved. Here are some useful hints to get involved.