From Fedora Project Wiki
Line 76: Line 76:

== Contingency Plan ==
== Contingency Plan ==
<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "None necessary, revert to previous release behaviour."  Or it might not.  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
* disable kernel options

== Documentation ==
== Documentation ==

Revision as of 08:44, 24 October 2012

= Checkpoint/Restore


Add support to checkpoint and restore processes. Checkpointing processes can be used for fault tolerance and/or load balancing.

Checkpointing a process in regular intervals can help to restart a process if it might crash to resume/restart/restore the calculation without too much data lost. Providing this ability transparent at the OS level removes the need to implement this functionality for all processes manually.

Checkpointing and restoring a process to another system can be used to migrate a process, process tree or container to another system to distribute the load during the runtime and also for maintenance without service interruption like it is possible with virtual machines.


  • Email: <>

Current status

  • Targeted release: Fedora 19
  • Last updated: 2012-10-24
  • Percentage of completion: 0%

Detailed Description

Checkpointing/restore, as mentioned above, can be used for fault tolerance and load distribution.

Fedora can offer checkpoint/restore by using CRIU (Checkpoint/Restore In Userspace). CRIU has been developed with the goal to be accepted by upstream and most patches necessary have already been accepted (as of 2012-10-24) in the kernel. The current release (0.2) of the userspace tools (crtools) offers the ability to checkpoint/restore containers and thus offering the ability to migrate containers.

To offer the checkpoint/restore functionality the package crtools has to be imported into Fedora and following changes are necessary to the kernel RPM:

diff --git a/config-x86_64-generic b/config-x86_64-generic
index 342b862..c5f8cf9 100644
--- a/config-x86_64-generic
+++ b/config-x86_64-generic
@@ -1,5 +1,8 @@
 # CONFIG_X86_X32 is not set
 # CONFIG_MK8 is not set
 # CONFIG_MPSC is not set

Benefit to Fedora

Fedora offers possibility to checkpoint/restore processes.


  • add the crtools package to Fedora
  • activate the three kernel options mentioned above (CONFIG_EXPERT, CONFIG_NAMESPACES, CONFIG_CHECKPOINT_RESTORE)

How To Test

User Experience

Users can easily checkpoint and restore processes with the crtools package:

crtools dump -D <destination-directory> -t <PID>
crtools restore -D <destination-directory> -t <PID>


  • add the crtools package to Fedora
  • activate the three kernel options mentioned above (CONFIG_EXPERT, CONFIG_NAMESPACES, CONFIG_CHECKPOINT_RESTORE)

Contingency Plan

  • disable kernel options


Release Notes

Comments and Discussion