Date: Sat, 28 Apr 2018 11:37:48 +0100 From: Mark Raynsford <list+org.freebsd.virtualization@io7m.com> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd-virtualization@freebsd.org Subject: Re: Read-only view of a ZFS filesystem inside a bhyve guest? Message-ID: <20180428113748.72891422@almond.int.arc7.info> In-Reply-To: <FCEED1DB-80FA-4407-9017-9B17F6E155B9@cs.huji.ac.il> References: <20180427174341.03373bc8@almond.int.arc7.info> <FCEED1DB-80FA-4407-9017-9B17F6E155B9@cs.huji.ac.il>
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--Sig_/NaDD0LvfDH.anCt.7Kvhdwx Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 2018-04-28T09:08:42 +0300 Daniel Braniss <danny@cs.huji.ac.il> wrote: > since the clients and the server are sharing the zfs volume, > I=E2=80=99m doing the following: > on the server I did: > zfs create -sV 4G h/root.ro <http://root.ro/>; > newfs /dev/zvol/h/root.ro <http://root.ro/>; > mount /dev/zol/h/root.ro <http://root.ro/>; /mnt > copy a working root image to it. > umount /mnt > the clients then mount it as ro, > the vm conflg file has: > disk0_type=3Dvirtio-blk=E2=80=9D > disk0_name=3D=E2=80=9C/dev/zvol/h/root.ro <http://root.ro/>=E2=80=9D > disk0_dev=3D=E2=80=9Ccustom=E2=80=9D >=20 > one solution to the fact that the root is read-only is to use unionfs (pr= obably nullfs will do too) >=20 > the only problem I have is updating the image. Wow, didn't know this was possible. Is this safe? Two essentially independent operating system instances being able to write to the same zvol? --=20 Mark Raynsford | http://www.io7m.com --Sig_/NaDD0LvfDH.anCt.7Kvhdwx Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iHUEARYKAB0WIQS4Thd0dhbGF0xo1eVcGntxKBLMBQUCWuRO/AAKCRBcGntxKBLM BVWOAP9saddfTN55XrBWM2Oonynt8y77rLrik6uqS7GxSKo3ZgD/e8JN6zcEPWW6 zFGAmQUgUVejemre3j4+Bb6N/Lw2kgk= =NSN+ -----END PGP SIGNATURE----- --Sig_/NaDD0LvfDH.anCt.7Kvhdwx--
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