[CRIU] system configuration for dumping/restoring LXC

[Andrey Wagin]

Hi Krystof,

I added criu at openvz.org in CC

2014-09-11 5:03 GMT+04:00 Krystof Zmudzinski <krystof_zmudzinski at yahoo.com>:

> Andrew,
>
> I've spent some time trying to build a system, which would allow me to
> dump and restore a Linux container using criu.  I started by reading
> instructions on this page LXC <http://criu.org/LXC> but the information
> seems buggy.  For example, test-lxc.conf has these 2 seemingly incompatible
> lines in it:
> lxc.mount = /root/test-lxc/etc/fstab
> lxc.rootfs = /root/test-lxc-root/
>
> So is the rootfs in /root/test-lxc or /root/test-lxc-root>
>

It can't be buggy, because I have copied this config from my test node. I
think you can use  /root/test-lxc and don't bind-mount /root/test-lxc
to /root/test-lxc-root, but you will need to do this bind-mount to restore
the CT.


>
> When I tried executing lxc-create -n test-lxc -f test-lxc.conf with the
> configuration as presented on that page, lxc-create failed.  When I changed
> rootfs to /root/test-lxc everywhere, it worked.  I was even able to dump
> the container using the criu-1.3 but restore never worked.  That was on
> Ubuntu 14.04.  When I switched to Fedora 20, even dump didn't work.
>

If you are able to dump the CT, you must able to restore it. If you can't
to do that, it's bug and we are ready to fix it. So could you show how you
execute criu and logs from "criu dump" and "criu restore"?


>
> I don't really care what system I have to use and how simple my container
> is.  I can tell that there are other people on the net who talk about
> successfully dumping and restoring containers but I can't figure out what
> system/container configurations they use.
>
> Could you provide me with a pointer to the host configuration and
> container configuration -- even if I have to go some older versions -- that
> allow for a successful dump/restore of a Linux container?
>
> BTW, I have been able to use criu-1.3 to dump/restore single processes.
>
> Thanks in adavance,
>
> Krystof
>
>
>
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>
> LXC <http://criu.org/LXC>
> This article describes how to perform checkpoint-restore for an LXC
> container.
> View on criu.org <http://criu.org/LXC>
> Preview by Yahoo
>
>
>
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