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Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?
From: |
edgar . soldin |
Subject: |
Re: [Duplicity-talk] Direct backup of LVM snapshot partitions? |
Date: |
Mon, 10 Dec 2012 13:13:13 +0100 |
User-agent: |
Mozilla/5.0 (Windows NT 5.1; rv:16.0) Gecko/20121026 Thunderbird/16.0.2 |
On 10.12.2012 12:58, George MacKerron wrote:
> Thanks Martin, that's really helpful -- I'll investigate rdiff.
>
> I guess an alternative feature that would support this use case might be
> duplicity backup of data from stdin (possibly with a nominal file name)? Then
> I could do something like:
>
> dd if=/dev/blah | duplicity --stdin-data=devblah.img ...
>
> In fact, the main thing I normally use duplicity for is backup of Postgres
> pg_dump output, and it seems like this would be really useful there too
> (avoiding a lot of disk space wasted on temporary files, and a lot of
> thrashing the disk) -- i.e.
>
> pg_dump … | duplicity --stdin-data=mydb.sql ...
>
> But perhaps there are reasons this wouldn't work -- such as needing random
> access to the data being backed up?
>
duplicity reads the data blockwise as a stream. so theoretically you could
extend duplicity to do a one "file" backup from STDIN . but that is some major
work, as _all_ of duplicity's actions would have to be modified and you will
have to work around the file attributes, which probably are not valid or
existing for the stream.
having said that. the easiest would be probably shell scripting a solution that
pipes eventually into gpg, if you really insist on having no physical file
anywhere.
using snapshots seems the easiest way to go for your scenario to me though. you
still haven't given a rationale not to use them. you risk backing up corrupted
data if you simply dump the device, you realize that right?
ede/duply.net
- [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/07
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?,
edgar . soldin <=
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, GDR!, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, GDR!, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, T. Prost, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, T. Prost, 2012/12/12
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/12