[CRIU] Help dumping and restoring a process
Adrian Reber
adrian at lisas.de
Tue Aug 21 22:19:43 MSK 2018
Replying also to the CRIU mailing list.
>From what you write that should be possible. Some more details would be
helpful.
Adrian
On Tue, Aug 21, 2018 at 12:53:59PM +0200, lupin10 at inwind.it wrote:
> Hi All,
>
> I'm also interested in something similar. In detail I would like to checkpoint/restore a live migration streaming audio-video content coming from a server deployed in a wan emulated environment towards some clients such as vlc. I am new in that ..some hint on what sequences of commands should I run ?
>
> Thanks in advance
>
> Alex
>
> >
> > Il 21 agosto 2018 alle 11.50 Adrian Reber <adrian at lisas.de> ha scritto:
> >
> > On Sat, Aug 18, 2018 at 02:32:03AM +0000, Jose Atiles wrote:
> >
> > > >
> > > Hi, I'm interested in using criu to do debugging in games, saving a checkpoint to recreate bugs. Also to provide saving to games who do not have this feature.
> > > My end target is saving a game that is being executed with wine. I'm currently using Linux mint 19 Mate 19.
> > >
> > > I have tried to dump a process but have failed.
> > > Also, criu check --extra says Looks good.
> > >
> > > I did a small test trying to checkpoint a calculator, a text editor and Firefox, but none seem to work. Can you provide me some usage examples? can you tell me one basic type of application which I could use to test CRIU?
> > >
> > > >
> > Like Radostin said, you cannot checkpoint applications which are using
> > the GUI without running in VNC. Which makes it pretty unusable for
> > games. If the game would be two parts, one server without GUI and a
> > 'dumb' GUI you could checkpoint the server. But I doubt any single
> > player game is written like that.
> >
> > > >
> > > The following is my log file, please help me!
> > >
> > > ies at mint:~$ sudo su
> > > [sudo] password for aries:
> > > root at mint:/home/aries# criu dump -D checkpoint -t 7909
> > > Warn (criu/kerndat.c:659): Can't load /run/criu.kdat
> > > Error (criu/image.c:416): Can't open dir checkpoint: No such file or directory
> > >
> > > >
> > That is easy. The destination directory does not exist.
> >
> > > >
> > > root at mint:/home/aries# criu dump -D /home/aries/Documents/test -t 7909
> > > Error (criu/namespaces.c:408): Can't dump nested net namespace for 8026
> > > Error (criu/namespaces.c:626): Can't make netns id
> > > Error (criu/cr-dump.c:1709): Dumping FAILED.
> > > root at mint:/home/aries# criu dump -D "/home/aries/Documents/test" -t 7909
> > > Error (criu/namespaces.c:408): Can't dump nested net namespace for 8026
> > > Error (criu/namespaces.c:626): Can't make netns id
> > > Error (criu/cr-dump.c:1709): Dumping FAILED.
> > > root at mint:/home/aries# criu dump -D /home/aries/Documents/test -t 7909
> > > Error (criu/namespaces.c:408): Can't dump nested net namespace for 8026
> > > Error (criu/namespaces.c:626): Can't make netns id
> > > Error (criu/cr-dump.c:1709): Dumping FAILED.
> > > root at mint:/home/aries# criu dump -D /home/aries/Documents/test -t 17604
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17604 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17608 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17609 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17610 with interrupted system call
> > > Error (criu/cr-dump.c:431): Task 17604 with SysVIPC shmem map @7fb97f613000 doesn't live in IPC ns
> > > Error (criu/cr-dump.c:1411): Dump mappings (pid: 17604) failed with -1
> > > Error (criu/cr-dump.c:1709): Dumping FAILED.
> > >
> > > >
> > All those attempts failed. Would be interesting to know what you are
> > trying to dump. You also need to have all processes involved in IPC
> > communication be part of the checkpoint. Namespaces are an easy way to
> > solve this.
> >
> > > >
> > > root at mint:/home/aries# criu restore -d -D /home/aries/Documents/test
> > > Error (criu/util.c:596): Can't read link of fd -404: No such file or directory
> > > Error (criu/protobuf.c:75): Unexpected EOF on (null)
> > >
> > > >
> > All your attempts to restore a process make no sense as all checkpoint
> > attempts failed.
> >
> > [...]
> >
> > > >
> > > root at mint:/home/aries# criu dump -D ./home/aries/Documents/test -t 17604
> > > Error (criu/image.c:416): Can't open dir ./home/aries/Documents/test: No such file or directory
> > >
> > > >
> > This is just wrong usage of a directory path.
> >
> > > >
> > > root at mint:/home/aries# cd /home/aries/Documents/test
> > > root at mint:/home/aries/Documents/test# criu dump -D /home/aries/Documents/test -t 17604
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17604 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17608 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17609 with interrupted system call
> > > Warn (compel/arch/x86/src/lib/infect.c:249): Will restore 17610 with interrupted system call
> > > Error (criu/cr-dump.c:431): Task 17604 with SysVIPC shmem map @7fb97f613000 doesn't live in IPC ns
> > > Error (criu/cr-dump.c:1411): Dump mappings (pid: 17604) failed with -1
> > > Error (criu/cr-dump.c:1709): Dumping FAILED.
> > > root at mint:/home/aries/Documents/test# criu check --extra
> > > Looks good.
> > > root at mint:/home/aries/Documents/test# test/zdtm.py run -a
> > > bash: test/zdtm.py: No such file or directory
> > > root at mint:/home/aries/Documents/test# cd ..
> > > root at mint:/home/aries/Documents# cd ..
> > > root at mint:/home/aries# cd ..
> > > root at mint:/home# cd ..
> > > root at mint:/# test/zdtm.py run -a
> > > bash: test/zdtm.py: No such file or directory
> > > root at mint:/# cd home
> > > root at mint:/home# test/zdtm.py run -a
> > > bash: test/zdtm.py: No such file or directory
> > > root at mint:/home# cd aries
> > > root at mint:/home/aries# test/zdtm.py run -a
> > > bash: test/zdtm.py: No such file or directory
> > >
> > > >
> > Running zdtm also seems wrong unless you have installed CRIU from
> > source.
> >
> > Please provide more details about the used CRIU version and the programs
> > you are trying to checkpoint.
> >
> > Adrian
> >
> > _______________________________________________
> > CRIU mailing list
> > CRIU at openvz.org
> > https://lists.openvz.org/mailman/listinfo/criu
> >
Adrian
--
Adrian Reber <adrian at lisas.de> http://lisas.de/~adrian/
"Mom, romance is dead. It was acquired in a hostile takeover by Hallmark and Disney, homogenized, and sold off piece by piece." -- Lisa Simpson
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