On Wed, Feb 01, 2012 at 08:30:31AM +0100, Stas Verberkt wrote: > L.S., > > 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 -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
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