Date: Wed, 1 Feb 2012 20:25:42 +0100 From: Roland Smith <rsmith@xs4all.nl> To: Stas Verberkt <legolas@legolasweb.nl> Cc: freebsd-questions@freebsd.org Subject: Re: Securely sharing directories between jails Message-ID: <20120201192542.GA60624@slackbox.erewhon.net> In-Reply-To: <20120201073031.GA1678@homey.local> References: <20120201073031.GA1678@homey.local>
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On Wed, Feb 01, 2012 at 08:30:31AM +0100, Stas Verberkt wrote:
> L.S.,
>=20
> I want to set up my system in a way where applications are clustered
> over jails, e.g. a httpd, smbd and dbmsd jail. However, in most cases I
> need to share data over the jails, which is stored on the host.
> Often, nullfs and mounting ro is suitable, but I need write access in
> some cases. As nullfs rw over multiple jails can be considered insecure,
> I was wondering what would be a secure way.
You could use a combination of nullfs and unionfs. Below is is what I do to
share /usr/ports on the host with a jail, but keep the jail from writing in
the host's tree.
host# cd /usr/local/var/jails/192.168.0.100/usr
host# mkdir tmp/foo
host# mount_nullfs /usr/ports/ ports/
host# mount_unionfs -o noatime tmp/foo ports/
With this, the jail sees the hosts' /usr/ports tree, but when it wants to
write there, the written files end up under tmp/foo in the jails' tree.
Roland
--=20
R.F.Smith http://www.xs4all.nl/~rsmith/
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