[Users] Ploop Vzdump

[Kir Kolyshkin]

On Oct 1, 2014 8:00 PM, "Scott Dowdle" <dowdle at montanalinux.org> wrote:
>
> Greetings,
>
> ----- Original Message -----
> > Been studying that.  Does not seem to compress backup.
>
> Hmmm, I see this within some of the shell script code:
>
>   tar cf backup.tar.xz
>
> Someone altered that... as that just means (c)reate (f)ile  You need to
add J for xz compression.  z for gz, etc.

I think nowdays tar guesses the compression algorithm from the file suffix
— this is true at least for decompression, it's enough to say xf and it
will figure the rest.

> It is just using the standard tar command so there should be no
mysteries... and you can use whatever flags you want for whatever type of
compression you want.
>
> What I do for my own backups, rather than tar and compress, is to rsync
to another directory on the host... but if I wanted a compressed .tar file
I would do it on my rsync'ed copy after the fact.
>
> > Also, does not spell out how to restore it.  Guess I can experiment but
I really
> > hopped ploop was far enough along that there were simple commands to
> > do all this.
>
> If you know how OpenVZ works, restoring it is fairly obvious but your
mileage may vary.  When a container is created a directory is created under
/vz/private named {ctid}.  Then the OS Template is extracted to that
directory.  Restoring from backup should be the exact same thing... or do
you just want a few files?  It depends.
>
> What does vzdump do?  How does it do its backup and restore?  It should
be fairly easy to mimic that.
>
> What ploop does is give one an easy way to make a snapshot which one can
make a backup of however desired... without interrupting the running
container.
>
> If you have additional questions, feel free to ask.  I'll try to update
the wiki entry to add the compression flag.
>
> TYL,
> --
> Scott Dowdle
> 704 Church Street
> Belgrade, MT 59714
> (406)388-0827 [home]
> (406)994-3931 [work]
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