deactivated centos 7 by now (see comments for more information)

etc/vagrant/bootstrap.sh

@@ -153,6 +153,7 @@ POSTGIS_VERSION="auto"      # activate to install from repository
 POSTGRESQL_VERSION="9.4"
 POSTGRESQL_SHORT_VERSION="94"
 POSTGRESQL_DATA_DIR="/var/lib/pgsql/$POSTGRESQL_VERSION/data"
+POSTGRESQL_GLOB_CONF="$POSTGRESQL_DATA_DIR/postgresql.conf"
 POSTGRESQL_HBA_CONF="$POSTGRESQL_DATA_DIR/pg_hba.conf"
 POSTGRESQL_PKG_NAME="postgresql$POSTGRESQL_SHORT_VERSION"
 POSTGRESQL_SERVICE_NAME="postgresql-$POSTGRESQL_VERSION"
@@ -798,8 +799,9 @@ if $INSTALL_POSTGRES; then
 
 	echo "Configuring and starting postgresql-server"
 	cp $SHARED_CONF_DIR/pg_hba.conf $POSTGRESQL_HBA_CONF
-	echo "listen_addresses = '*'" >> $POSTGRESQL_DATA_DIR/postgresql.conf
-	echo "port = 5432" >> $POSTGRESQL_DATA_DIR/postgresql.conf
+	echo "listen_addresses = '*'" >> $POSTGRESQL_GLOB_CONF
+	echo "port = 5432" >> $POSTGRESQL_GLOB_CONF
+	echo "log_hostname = off" >> $POSTGRESQL_GLOB_CONF
 fi
 
 if $INSTALL_POSTGRES_ADMIN; then