[CRIU] Re, Issues dumping MySQL process

[Hui Kang]

Hi, Pavel,


On Thu, Mar 19, 2015 at 11:52 AM, Pavel Emelyanov <xemul at parallels.com>
wrote:

> On 03/19/2015 06:25 PM, Hui Kang wrote:
> > Hi, Pavel,
> > Thanks for you comment. I have another question about dump the image of
> a MySQL and restore it on a different host.
> >
> > I used the command "criu dump mysql-pid -j"
>
> Well, -j is not needed if MySQL is started as daemon.
>
> > to dump a MySQL. And then I copy al the dumped images to another host.
> After I run "criu restore". It complains
> > about "bad size of /var/log/mysql/error.log and /var/lib/mysql/".
>
> Yup, that's the attempt to protect restoring on bad files.
>
> > After I copy these two directory from the original host to the restored
> host, the mysql process can be restored.
> > My question is during dumping, can I also dump all the related file and
> directory?
>
> With CRIU -- no. We deliberately avoid messing with the filesystem as
> handling it
> heavily depends on the use case. E.g. for seamless kernel update nothing
> should
> be done with the FS.
>
> For live migration -- non shared filesystems should be copied, but this
> can and
> should be done in a more effective manner than plain scp :) In order to
> address
> that and make live migration easier we started the P.Haul project that
> uses criu
> to dump and restore tasks and handles images copying, iterations, memory
> post-
> and pre-copy as well as FS synchronization. The project is not as active
> as CRIU
>

Does p.hauler support FS synchronization? For example, if I want to migrate
process P from host A to host B. P is writing to a file, say /tmp/dump.log.

Will p.hauler automatically copy /tmp/dump.log to host B? Thanks.

- Hui


> and quite raw at the moment, but I plan to resurrect the activity by April
> :) So
> you're also welcome to join!
>
> P.Haul lives at http://criu.org/P.Haul
>
> > Thanks.
> >
> > - Hui
>
> Thanks,
> Pavel
>
>
>
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