[…]
        --->  Installing postgresql90-server @9.0.5_0

        To create a database instance, after install do
         sudo mkdir -p /opt/local/var/db/postgresql90/defaultdb
         sudo chown postgres:postgres /opt/local/var/db/postgresql90/defaultdb
         sudo su postgres -c '/opt/local/lib/postgresql90/bin/initdb -D 
/opt/local/var/db/postgresql90/defaultdb'

        To tweak your DBMS, consider increasing kern.sysv.shmmax by adding an 
increased kern.sysv.shmmax .. to /etc/sysctl.conf
        --->  Activating postgresql90-server @9.0.5_0
        --->  Cleaning postgresql90-server
        Sun Oct 23 12:45:49 -- server :: sudo mkdir -p 
/opt/local/var/db/postgresql90/defaultdb
        Sun Oct 23 12:48:41 -- server :: sudo chown postgres:postgres 
/opt/local/var/db/postgresql90/defaultdb
        chown: postgres: Invalid argument
        Sun Oct 23 12:48:51 -- server :: 


So, according to the above instructions (and the tutorials I've read), this 
should simply work. What am I missing?

On a different note, I have a couple questions concerning PostgreSQL security:

1. My understanding is that making the defaultdb directory owned by the 
postgres user is for security. Correct?
2. Whenever starting psql, I have on my own machines had to specify "psql -U 
postgres", because:

        Sun Oct 23 14:27:28 -- Frodo :: psql
        psql: FATAL: role "rene" does not exist 

        So, I do I need to add a role/user for my OS X user name?

Coming from MySQL, I find the devil is in the details. Just trying to figure 
things out… Thanks!

…Rene
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