Dear everybody
I installed postgresql 8.0.7 on Fedora 5 successful.Now i want to auto start postgresql. So i copied the auto start script to /etc/init.d and made some changes to correct this script. And i also registered postgresql to the services management (using chkconfig).
The content of auto start script is as follow:

# Installation prefix
prefix=/usr/local/pgsql

# Data directory
PGDATA="/usr/local/pgsql/data"

# Who to run the postmaster as, usually "postgres". (NOT "root")
PGUSER=postgres

# Where to keep a log file
PGLOG="$PGDATA/serverlog"

## STOP EDITING HERE

# Check for echo -n vs echo \c
if echo '\c' | grep -s c >/dev/null 2>&1 ; then
ECHO_N="echo -n"
ECHO_C=""
else
ECHO_N="echo"
ECHO_C='\c'
fi

# The path that is to be used for the script
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# What to use to start up the postmaster (we do NOT use pg_ctl for this,
# as it adds no value and can cause the postmaster to misrecognize a stale
# lock file)
DAEMON="$prefix/bin/postmaster"

# What to use to shut down the postmaster
PGCTL="$prefix/bin/pg_ctl"

set -e

# Only start if we can find the postmaster.
test -x $DAEMON || exit 0

# Parse command line parameters.
case $1 in
start)
$ECHO_N "Starting PostgreSQL: "$ECHO_C
su - $PGUSER -c "$DAEMON -i -D $PGDATA" >>$PGLOG 2>&1 &
echo "ok"
;;
stop)
echo -n "Stopping PostgreSQL: "
su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast"
echo "ok"
;;
restart)
echo -n "Restarting PostgreSQL: "
su - $PGUSER -c "$PGCTL stop -D '$PGDATA' -s -m fast -w"
su - $PGUSER -c "$DAEMON -D $PGDATA" >>$PGLOG 2>&1 &
echo "ok"
;;
reload)
echo -n "Reload PostgreSQL: "
su - $PGUSER -c "$PGCTL reload -D '$PGDATA' -s"
echo "ok"
;;
status)
su - $PGUSER -c "$PGCTL status -D '$PGDATA'"
;;
*)
# Print help
echo "Usage: $0 {start|stop|restart|reload|status}" 1>&2
exit 1
;;
esac

exit 0


I can run this script normally after i login. But when i boot system, the console informs that postgresql starts succcesful. But actually, postgresql doesn't start, and log file doesn't changed any more. So log file doesn't give me any information about the errors. I wonder why there is the different when running this script before and after i login. And why the console informs postgresql start succesful but it doesn't.
Everybody knows the reason, please help me.

After i install default postgresql 8.1.4 packages attached Fedora 5, the auto start script of postgresql give me some glues. Because Fedora 5 has SELinux policy, so i must use 'runuser' command instead of 'su' command. And i only make this change to above script. The problem is fixed.But with another services, no need to use 'runuser' to replace 'su'.