It shouldn't affect unbound's ability to cache anything.  However, I
personally think it is inappropriate to run a DNS cache on an exit
node, because that preserves a record on the exit node of what people
are using it for.

zw

Hey,
I'm not an Unbound expert, I think Unbound doesn't log any DNS queries...?
What I know is only statistics can be given with the command "unbound-control stats", only numbers are shown.
In my unbound.conf, the only log config lines are :
logfile: "/var/log/unbound.log"
use-syslog: no

And this /var/log/unbound.log doesn't exist on my system...
Is there way to see DNS queries made by users ?

For me, about privacy, it's not necessary a problem about "knowing what are doing your Tor users", because if it's not you, it will be your DNS resolvers... As read before, a lot of Tor exists are using Google DNS :p (I think it's lol about privacy!)
So the bad guy will know the DNS queries, but he doesn't know who has made it (only exit IP is shown ?), so privacy is safe ?

-- 
Petrusko
PubKey EBE23AE5
C0BF 2184 4A77 4A18 90E9 F72C B3CA E665 EBE2 3AE5