Date: Wed, 4 Oct 2017 12:09:49 +0200 From: Polytropon <freebsd@edvax.de> To: Johan Hendriks <joh.hendriks@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Edit the qcow2 FreeBSD image file Message-ID: <20171004120949.24b4cd25.freebsd@edvax.de> In-Reply-To: <bc0b02fb-e121-be41-e5ce-1b2d84958d1c@gmail.com> References: <dc133ebc-d931-6b9e-b989-bf8e69b2be81@gmail.com> <20171004112931.bb6524b9.freebsd@edvax.de> <bc0b02fb-e121-be41-e5ce-1b2d84958d1c@gmail.com>
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On Wed, 4 Oct 2017 12:02:56 +0200, Johan Hendriks wrote:
>=20
>=20
> Op 04/10/2017 om 11:29 schreef Polytropon:
> > On Wed, 4 Oct 2017 09:47:47 +0200, Johan Hendriks wrote:
> >> I want to add a script to the default qcow2 file of the FreeBSD qcow2 =
image.
> >> But how do i mount the qcow2 file on FreeBSD?
> >> There are a lot of howto's how to do it on Linux but i do not always
> >> have a Linux box ready.
> > Without having verified, I'd say something like this will work:
> >
> > # mdconfig -a -t vnode -f <flename> -u 0
> > # mount -t ufs -o rw /dev/md0s1a /mnt
> >
> > The key is to connect the file to a md device ("memory disk"),
> > and then use it as if it was a real disk. But always check the
> > correct device file name - md0 will reflect the "disk layout"
> > of the image file, so maybe you need to use /dev/md0p1 or
> > /dev/md0a or simply /dev/md0, so check "ls /dev/md0*" to see
> > how the layout is being translated to device files - this
> > depends on the layout that has been constructed within the
> > image file.
> >
> > When you're done, use:
> >
> > # umount /mnt
> > # mdconfig -d -u 0
> >
> > This will finally sync any changes and disconnect the device.
> > The image file can be used now.
> >
> Thanks, I tried that, but it does not work.
> root@desk:~ # mdconfig -a -t vnode -f FreeBSD-11.1-RELEASE-amd64.qcow2 -u=
0
>=20
> Then a ls of /dev/md0 only shows md0 and i can not mount that one.
> root@desk:~ # ls -al /dev/md*
> crw-r-----=A0 1 root=A0 operator=A0 0x8c Oct=A0 4 11:48 /dev/md0
> crw-------=A0 1 root=A0 wheel=A0=A0=A0=A0=A0 0xb Sep 21 14:16 /dev/mdctl
>=20
> And a mount of /dev/md0 gives an error.
>=20
> root@desk:~ # mount -t ufs -o rw /dev/md0 /mnt
> mount: /dev/md0: Invalid argument
Check the file format of md0 if it is recognized as a filesystem
image:
# file FreeBSD-11.1-RELEASE-amd64.qcow2
# file -s /dev/md0
it should be recognized as a UFS file system (typically called
"Unix Fast File system [v2]"). Note that you can only mount a
file system which is being recognized correctly.
--=20
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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