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Re: [Qemu-discuss] filename in json is unsupport for rbd in qemu-img?

From: Max Reitz
Subject: Re: [Qemu-discuss] filename in json is unsupport for rbd in qemu-img?
Date: Wed, 17 May 2017 15:00:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 2017-05-17 05:21, Han Han wrote:
> Hello, I am using qemu-2.9 and try this command:
> # qemu-img info
> 'json:{"file.driver":"rbd","file.filename":"rbd:rbd/rbd.img:mon_host=XXXX"}'
> qemu-img: Could not open
> 'json:{"file.driver":"rbd","file.filename":"rbd:rbd/rbd.img:mon_host=XXXX"}':
> Parameters 'pool' and 'image' are required
> Refer to https://bugzilla.redhat.com/show_bug.cgi?id=1371758#c5, it
> works in qemu-2.8. So I want make sure if this json format is disabled
> in qemu-2.9.

Yes, it is. See here how the options work now:


As of 2.9, the blockdev-add QMP command is considered stable. Therefore,
this new RBD interface is stable, too.

But I'm not sure why you would use a JSON filename there anyway. Why not
just use

$ qemu-img info rbd:rbd/rbd.img:mon_host=XXXX



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