b0b9a97086
Most of the changes this time are preparation for future new features and optimizations, that hasn't yet been well tested and polished. However, we have several new features. The most important one is the --tcp-close option to help migration of Docker containers, that constantly change their IP address. And, as usually, a set of bugfixes. Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com> |
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| compel | ||
| contrib | ||
| coredump | ||
| crit | ||
| criu | ||
| Documentation | ||
| images | ||
| include/common | ||
| lib | ||
| scripts | ||
| soccr | ||
| test | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| COPYING | ||
| CREDITS | ||
| INSTALL.md | ||
| Makefile | ||
| Makefile.compel | ||
| Makefile.config | ||
| Makefile.install | ||
| Makefile.versions | ||
| README.md | ||
CRIU (Checkpoint and Restore in Userspace)
An utility to checkpoint/restore tasks. 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.
Also, CRIU provides a library for Live migration, and exposes two low-level core features as standalone libraries. Thes are libcompel for parasite code injection and libsoccr for TCP connections checkpoint-restore.
The project home is at http://criu.org.
Pages worth starting with are:
- Kernel configuration, compilation, etc
- A simple example of usage
- More sophisticated example with graphical app
A video tour on basic CRIU features
Live migration
True live migration using CRIU is possible, but doing all the steps by hands might be complicated. The phaul sub-project provides a Go library that incapsulates most of the complexity.
Parasite code ijection
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 killing the application itself, CRIU uses the parasite code injection technique, which is also available as a standalone library called libcompel.
TCP sockets checkpoint-restore
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 tiself, and we have it available as the libsoccr library.
How to contribute
- How to submit patches;
- Send all bug reports to mailing list;
- Spread the word about CRIU in social networks;
Licence
The project is licensed under GPLv2 (though files sitting in the lib/ directory are LGPLv2.1).