dblink connect per socket / specify cluster name

[james garner <jamgarn@xxxxxxxxx>]

Dear list,

i'm running PgSQL 9.3 on Debian installed from the Debian packets.

I'm using dblink to access a different database.

When im trying to connect to the database by socket via
dblink_exec('dbname=test host=/var/run/postgresql' ..

everything works nicely if there's just one db-cluster named 'main'

I didn't find a way however to select a different cluser name.

If a connection is made by TCP, the cluster ist determined by the port, but how is it done when connecting by socket?

Thanks