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Re: [Qemu-block] [Qemu-devel] [PATCH 2/2] ssh: implement private key aut

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 2/2] ssh: implement private key authentication
Date: Mon, 12 Aug 2019 16:22:30 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

On 7/29/19 6:08 AM, Kevin Wolf wrote:

>> On a different topic, how much of this work overlaps with the nbdkit ssh
>> plugin? Should we be duplicating efforts with both projects supporting
>> ssh natively, or is it worth considering getting qemu out of the ssh
>> business and instead connecting to an nbd device provided by nbdkit
>> connecting to ssh?
> ssh behaves essentially like a filesystem whereas NBD behaves like a
> block device. This is especially relevant for everything related to the
> file size. As far as I know, using an image format like qcow2 that wants
> to grow the image file isn't possible over NBD, whereas I expect it to
> work with the ssh block driver.

Resizing NBD devices isn't available yet, but it is rapidly moving
higher on my list of TODO items to implement as an extension (the ideas
for how it should work have been tossed around, but having code to back
up those ideas is the next step).

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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