[CRIU] Re: Issues of using CRtools

[a-shinkevich at yandex.ru]

Thanks again for your help!
Kind regards,
Andrey.

11.10.12, 21:51, "Pavel Emelyanov" <xemul at parallels.com>":
> 
> On 10/11/2012 09:37 PM, Shinkevich Andrey wrote:
> > Dear Pavel!
> > Thank you very much for answering my questions.
> > Please note:
> > 1. When I use the following commands
> > ./busyloop00 --outfile=output.txt --pidfile=pid.txt
> > sudo crtools dump -c -t 4948
> > 
> > I do specify '-c' option to leave the process busyloop00 with the pid 4948  running.
> > But the process busyloop00 terminates anyway.
> 
> There's a bug in documentation :( The truth is in crtools --help output
> 
> > 2. Then I run the command
> > 
> > sudo crtools restore -d -t 4948
> > 
> > and the porcess with the same pid is restored. Then I kill the process 4948 manually and run the command again:
> > sudo crtools restore -d -t 4948
> > 
> > The restoration fails with the following message:
> > 
> >   4948: Error (files-reg.c:406): Can't open file on restore: No such file or directory
> >   4948: Error (files-reg.c:367): Can't open file output.txt.inprogress: No such file or directory
> > Error (cr-restore.c:633): 4948 exited, status=255
> 
> That's because on process death the file output.txt.inprogress is removed. Note, that
> crtools dumps state of _applications_, not the filesystem they run on.
> 
> > If I create an empty file output.txt.inprogress the process is restored OK.
> 
> That's good news.
> 
> > Best regards,
> > Andrey
> > 
> > 10.10.2012, 16:38, "Pavel Emelyanov" <xemul at parallels.com>:
> > 
> > On 10/10/2012 04:20 PM, Shinkevich Andrey wrote:
> > 
> >  Dear Pavel! Thank you for your efforts in developping CRtools!
> >  E-mail is the only way I found to contact you.
> > 
> > Please, keep the mailing list in Cc, other people can also help.
> > 
> >  I am new in Linux Kernel and trying to test CRtools to see how it works.
> >  But I've encountered some issues in running CRtools and ask you for favor to assist me in
> >  resolving them. - I run CRtools 2.0 on Ubuntu i86-64 VirtualBox - The Linux kernel has been
> >  updated and 'sudo crtools check' ends with the message "Looks Good." - Running CRtools without
> >  'sudo' results in "Permission denied" message
> > 
> > This is kernel requirement. Lots of the APIs we use require root prio.
> > 
> >  - If I run 'gcalctool &' command from
> >  Terminal(tty), and then 'sudo crtools dump -t 7472 -c' the error message appears: "tty.c:156
> >  Found slave peer index 0 without correspond master peer"
> > 
> > That's because you dump only one end of a PTY. This case is not supported yet, but
> > we're working on this.
> > 
> >  - If I run the Calculator from Ubuntu
> >  GUI and then run the command 'sudo crtools dump -t 7494 -c', the image files are generated and
> >  the process 7494 is killed anyway.
> > 
> > Read the help carefully. By default crtools kills the processes it dumped, but there's a way
> > to override this behavior.
> > 
> >  - Then the following command 'sudo crtools restore -t 7494' results in forced user logging off
> > 
> > This can be because X apps may use SysVIPC resources you didn't dump and at the restore stage
> > X server may go nuts and act strange. Another thing is that dumping X apps is tricky, since
> > part of application state resides on the Xserver side and crtools currently do not handle this.
> > 
> > If you are familiar with how X works and can participate to the project this will be appreciated.
> > 
> >  - Additional option '-n uts, ipc' does not help
> > 
> > Absolutely.
> > 
> >  1. What is wrong with it and how can I run the CRtools correctly?
> > 
> > The usecases we've recently worked on include 3 cases
> > 
> > a) daemons
> > b) shell tools (but there are limitations with PTYs and sids. Effectively you can
> >    for now only succeed when using the screen app, but it's improving)
> > c) containers
> > 
> > Dumping X apps was not taken into account yet. The demo you might have seen on Yandex
> > conference dumped a VNC X _server_, which is not the same as dumping X client (i.e. app).
> > 
> >  2. Where and how can I download the ZDTM test suite?
> > 
> > It's in the sources in the test/zdtm directory. Plus reading http://criu.org/ZDTM_Test_Suite
> > might help.
> > 
> >  Thank you! You may respond in Russian if you like. Best regards, Andrey
> > 
> > Thanks,
> > Pavel
> > 
> 
> 


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