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Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux in userspace.
Checkpoint/Restore In Userspace, or CRIU, 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.
The project is currently under very active development. CRIU is a sub-project of OpenVZ.
Using
- Installation
- What to do to have CRIU on your system
- Usage
- How to run the tool
- Usage scenarios
- Ideas how crtools can be used (some are crazy indeed)
- What software is supported
- Describes TODO list in higher level terms
- LXC
- How to dump and restore an LXC container
Developing
If you're interested in CRIU development, please subscribe to the criu mailing list: https://openvz.org/mailman/listinfo/criu
- Images
- Description of image files format
- Commits
- Mainline kernel commits tracker
- ZDTM Test Suite
- Zero downtime test suite
- TODO
- Current TODO list
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Under the hood
External links
- 2025-11-17, Engine-Agnostic Model Hot-Swapping for Cost-Effective LLM Inference
- 2025-08-13, Software Availability Protection in Cyber-Physical Systems
- 2025-07-14, PhoenixOS: Concurrent OS-level GPU Checkpoint and Restore with Validated Speculation
- 2025-06-18, Improving Checkpoint/Restore Functionality in Kubernetes
- 2025-06-17, LWN.net: A parallel path for GPU restore in CRIU
- 2025-06-13, Kubernetes Scheduling with Checkpoint/Restore: Challenges and Open Problems
Other
- Project history
- Logo description
- Events
- Join the CRIU acronym fun
http://static.openvz.org/wiki/openvz-logo.png