Shared authentication across FreeBSD Jails

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http://serverfault.com – I am using FreeBSD with ZFS to run several jails. For jail management I'm using ezjail, and I have a template jail which I use for provisioning. I want to share passwd, groups, and authentication information across all jails and the host. For the jails it can be read-only. Is there some mechanism which can share the host passwd, groups, etc. without any complex system such as LDAP/NIS/etc.? (HowTos)