Peter,

> Compare this with jails:
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html

How do BSD jails address letting two services talk to one another,
in a limited way?

For example, postfix wants to talk to dovecot's SASL implementation over
a unix socket.

The way this works for me at the moment (on Linux) is that one opens a
socket in the other's chroot area, before chrooting into its own area.
Because it was already open before chroot(2), it can continue using it.

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