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Welcome to CRIU, a project to implement checkpoint/restore functionality for Linux in userspace.

Download Tarball: criu-4.1.tar.gz Version: 4.1 "CRISCV" Released: 25 Mar 2025 GIT tag: v4.1 Installation • Usage Releases

CRIU is a sub-project of OpenVZ Linux Containers.

Latest version

Tarball:	criu-4.1.tar.gz
Version:	4.1 "CRISCV"
Released:	25 Mar 2025
GIT tag:	v4.1

New features

• RISC-V Support
• PIDFD Support
• arm64: C/R PAC keys

Bugfixes

• vdso: handle vvar_vclock vma-s
• seize: Take --timeout option into account when freezing processes
• net: use unique lock chain names (nftables)
• Fixes here and there.

Improvements

• CUDA Enhancements
• Allow setting the default network locking backend
• Enable coredump generation for aarch64 and arm
• vdso: switch from DT_HASH to DT_GNU_HASH

Old versions

3.x

The following 3.x releases were made:

• 3.19 "Bronze Peacock"
• 3.18 "Silver Sandpiper"
• 3.17.1 "Radiant Redstart"
• 3.17 "Radiant Redstart"
• 3.16.1 "Petrified Puffin"
• 3.16 "Petrified Puffin"
• 3.15 "Titanium Falcon"
• 3.14 "Platinum Peacock"
• 3.13 "Silicon Willet"
• 3.12 "Ice Penguin"
• 3.11 "Glass Flamingo"
• 3.10 "Granite Eagle"
• 3.9 "Sand Martin"
• 3.8.1 "Snow Bunting"
• 3.8 "Snow Bunting"
• 3.7 "Vinyl Magpie"
• 3.6 "Alabaster Finch"
• 3.5 "Clay Jay"
• 3.4 "Cobalt Swan"
• 3.3 "Crystal Pelican"
• 3.2.1
• 3.2 "Tin Hoopoe"
• 3.1 "Graphene Swift"
• 3.0 "Basalt Wagtail"

2.x

The following 2.x releases were made:

• 2.12.1
• 2.12 "Vulcanite Rook"
• 2.11.1
• 2.11 "Acrylic Bullfinch"
• 2.10 "Brass Waxwing"
• 2.9 "Silk Tit"
• 2.8 "Bronze Siskin"
• 2.7 "Rubber Owl"
• 2.6 "Paper Crane"
• 2.5 "Concrete Oriole"
• 2.4 "Marble Lark"
• 2.3 "Wooden Duck"
• 2.2 "Carbon Nightingale"
• 2.1 "Steel Lapwing"
• 2.0

1.x

The following 1.x releases were made:

• 1.8
• 1.7.2
• 1.7
• 1.6.1
• 1.6
• 1.5.2
• 1.5.1
• 1.5
• 1.4
• 1.3.1
• 1.3
• 1.3-rc2
• 1.3-rc1
• 1.2
• 1.1
• 1.1-rc2
• 1.1-rc1
• 1.0

0.x

The following 0.x releases were made:

• 0.8
• 0.7
• 0.6
• 0.5
• 0.4
• 0.3
• 0.2
• 0.1

See also

• Changelogs to see all the changelogs on a single page.

Using

CR tools

Main checkpoint/restore utility description (sort of HOWTO)

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, 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

Under the hood

• Sockets
• Memory dumping and restoring
• Checkpoint/Restore
• TCP connection
• Porting crtools to new kernel releases
• Files

External links

• 2025-02-23, CRIUgpu: Transparent Checkpointing of GPU-Accelerated Workloads
• 2024-11-14, On-demand and Parallel Checkpoint/Restore for GPU Applications
• 2024-09-06, Live Migration of Multi-Container Kubernetes Pods in Multi-Cluster Serverless Edge Systems
• 2024-09-04, Towards Efficient End-to-End Encryption for Container Checkpointing Systems
• 2024-08-21, The State of Container Checkpointing with CRIU: A Multi-Case Experience Report
• 2024-08-04, Custom Page Fault Handling With eBPF
• 2024-08-03, Software-based Live Migration for Containerized RDMA
• 2024-07-30, Packet Buffering to Minimize Service Downtime and Packet Loss During Redundancy Switchover
• 2024-07-30, Don't, Stop, Drop, Pause: Forensics of CONtainer CheckPOINTs (ConPoint)

More external articles...