Configure a lofs (LOopback virtual FileSystem) shared area between zones

Operating System: Solaris 10 & variants

Create area to be shared on global zone, e.g. /share

mkdir /share

Configure the zones to use the shared area:

# zonecfg -z zone1
zonecfg:zone1> add fs
zonecfg:zone1> set dir=/share
zonecfg:zone1> set special=/share/sharex
zonecfg:zone1> set type=lofs
zonecfg:zone1> end
zonecfg:zone1> verify
zonecfg:zone1> commit
zonecfg:zone1> exit
# zonecfg -z zone2
zonecfg:zone2> add fs
zonecfg:zone2> set dir=/share
zonecfg:zone2> set special=/share/sharex
zonecfg:zone2> set type=lofs
zonecfg:zone2> end
zonecfg:zone2> verify
zonecfg:zone2> commit
zonecfg:zone2> exit
#

Reboot both zones

# zoneadm -z zone1 reboot
# zoneadm -z zone2 reboot

The filesystems will now be available and fully writeable for both zones.  There is no limit to the number of zones that can share the filesystem.