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LPC2015 Checkpoint Restore notes (edit)
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Welcome to Linux Plumbers Conference 2015
[[Image:LPC-microconf-2015.jpg|right|thumb|300px]]
The structure will be short introductions to an issue or topic followed by a discussion with the audience.
The structure will be short introductions to an issue or topic followed by a discussion with the audience.
SCHEDULE
SCHEDULE
== Checkpoint and Restore of processes within kernel security mechanisms ==
Tycho Andersen of Canonical, CRIU contributor
Tycho Andersen of Canonical, CRIU contributor
Answer: yes, there is a tool for it.
Answer: yes, there is a tool for it.
== CRIU in HPC ==
Adrian Reber, an old-time CRIU contributor, Red Hat
Adrian Reber, an old-time CRIU contributor, RedHat
* research project in a university involving CRIU, started in 2009
* research project in a university involving CRIU, started in 2009
* usage scenario: computer simulation for product develpment
* usage scenario: computer simulation for product develpment
* summary: transparent migration works, OpenMPI supports CRIU (but keeps breaking as OpenMPI moves forward very fast), Parallel migration has WIP status
* summary: transparent migration works, OpenMPI supports CRIU (but keeps breaking as OpenMPI moves forward very fast), Parallel migration has WIP status
== CRIU on PowerPC ==
Laurent Dufour, ported CRIU to PowerPC architecture, IBM
Laurent Dufour, ported CRIU to PowerPC architecture, IBM
CRIU 1.6 ported on Power this summer (What did you do this summer? I ported CRIU to PowerPC).
CRIU 1.6 ported on Power this summer (What did you do this summer? I ported CRIU to PowerPC).
* A hindrance to getting docker up and running in CRIU/ppc is that the images it downloads at build/startup are x86_64 images. Help requested.
* A hindrance to getting docker up and running in CRIU/ppc is that the images it downloads at build/startup are x86_64 images. Help requested.
== CRIU Support in Docker for Native Checkpoint and Restore ==
Saied Kazemi, working on container migration at Google
Saied Kazemi, working on container migration at Google
* short history of Docker C/R
* short history of Docker C/R
Slides from Docker Meetup 2014 https://speakerdeck.com/saied/experimental-docker-checkpoint-and-restore-with-criu
Slides from Docker Meetup 2014 https://speakerdeck.com/saied/experimental-docker-checkpoint-and-restore-with-criu
== P.Haul: live migrating with CRIU ==
Pavel Emelyanov, man in a red T-shirt with microphone
Pavel Emelyanov, man in a red T-shirt with microphone
* Process-Haul (like U-Haul, but about processes) See http://criu.org/P.Haul
* Process-Haul (like U-Haul, but about processes) See http://criu.org/P.Haul
* CRIU part of live migration: perform nodes compat checks, pre-dumps in a loop, copy fs if not shared, don't forget container config
* CRIU part of live migration: perform nodes compat checks, pre-dumps in a loop, copy fs if not shared, don't forget container config
* P.Haul migrate container is two steps
* P.Haul migrate container is two steps
* More information about P.Haul: written in Python, source code https://github.com/xemul/p.haul/, can migrate OpenVZ container (How-to https://github.com/xemul/p.haul/blob/master/test/mtouch/HOWTO), call rsync on chroot-ed container
* More information about P.Haul: written in Python, source code https://github.com/checkpoint-restore/p.haul/, can migrate OpenVZ container (How-to https://github.com/checkpoint-restore/p.haul/blob/master/test/mtouch/HOWTO), call rsync on chroot-ed container
* P.Haul future: Docker/LXC support, smarter interations, shared FS autodetection, post-copy live migration, send images over the wire (CRIU)
* P.Haul future: Docker/LXC support, smarter interations, shared FS autodetection, post-copy live migration, send images over the wire (CRIU)
* Discussion of P.Haul started
* Discussion of P.Haul started
Predump allows process to continue running, vs full dump which is a freeze
Predump allows process to continue running, vs full dump which is a freeze
== Rebootless Kernel Update and its verification ==
Sanidhya Kashyap, PhD student (Georgia Institute of Technology) and CRIU contributor http://www.cc.gatech.edu/~skashyap/
Sanidhya Kashyap, PhD student (Georgia Institute of Technology) and CRIU contributor http://www.cc.gatech.edu/~skashyap/
* types of OS update with low downtime: dynamic kernel patching (KSplice, Kpatch and Kgraft)
* types of OS update with low downtime: dynamic kernel patching (KSplice, Kpatch and Kgraft)
* Conclusion: implement native support for page cache, hugepages; on-demand restore with usefaultd; need to overhaul kexec
* Conclusion: implement native support for page cache, hugepages; on-demand restore with usefaultd; need to overhaul kexec
== Using CRIU for Computer Architecture and Software Studies ==
Christopher Covington, spec in performance analysis and simulation at Qualcomm, http://covlibre.net/
Christopher Covington, spec in performance analysis and simulation at Qualcomm, http://covlibre.net/
* speaker starts from terminology, it seems talk will be quite technical :P zOMG a technical talk? Isn't it a sales conference?? (it was a joke :) ) (I'll buy two) Take three and get a 25% discount!
* speaker starts from terminology, it seems talk will be quite technical :P zOMG a technical talk? Isn't it a sales conference?? (it was a joke :) ) (I'll buy two) Take three and get a 25% discount!