Error while installing PostgreSQL

While installing PostreSQL I have follow start DB-server error:
/usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data >logfile 2>&1 &
$errors: LOG:  could not bind IPv4 socket: address alredy in use HINT:  Is another postmaster already running on port 5432? If not, wait a few seconds and retry.$

I stop already starting db:
etc/init.d/postresql stop
And all is OK.

There is small test for correct work of PostgreSQL:
/usr/local/pgsql/bin/createdb test
/usr/local/pgsql/bin/psql test