PostgreSQL postgresql configuration example for CentOS Linux 6

Get the default configuration file postgresql for PostgreSQL, optimized for CentOS Linux 6. This example configuration ensures optimal compatibility and performance for PostgreSQL, making it easy to set up and adjust to meet your needs.

Find and download the configuration file here: /etc/rc.d/init.d/postgresql.

For more configurations and setup guides, visit our related files section to further customize your system.

    #!/bin/sh
#
# postgresql	This is the init script for starting up the PostgreSQL
#		server.
#
# chkconfig: - 64 36
# description: PostgreSQL database server.
# processname: postmaster
# pidfile: /var/run/postmaster.PORT.pid

# This script is slightly unusual in that the name of the daemon (postmaster)
# is not the same as the name of the subsystem (postgresql)

# PGVERSION is the full package version, e.g., 8.4.0
# Note: the specfile inserts the correct value during package build
PGVERSION=8.4.20
# PGMAJORVERSION is major version, e.g., 8.4 (this should match PG_VERSION)
PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`

# Source function library.
. /etc/rc.d/init.d/functions

# Get network config.
. /etc/sysconfig/network

# Find the name of the script
NAME=`basename $0`
if [ ${NAME:0:1} = "S" -o ${NAME:0:1} = "K" ]
then
	NAME=${NAME:3}
fi

# For SELinux we need to use 'runuser' not 'su'
if [ -x /sbin/runuser ]
then
    SU=runuser
else
    SU=su
fi


# Set defaults for configuration variables
PGENGINE=/usr/bin
PGPORT=5432
PGDATA=/var/lib/pgsql/data
PGLOG=/var/lib/pgsql/pgstartup.log
# Value to set as postmaster process's oom_adj
PG_OOM_ADJ=-17

# Override defaults from /etc/sysconfig/pgsql if file is present
[ -f /etc/sysconfig/pgsql/${NAME} ] && . /etc/sysconfig/pgsql/${NAME}

export PGDATA
export PGPORT

lockfile="/var/lock/subsys/${NAME}"
pidfile="/var/run/postmaster.${PGPORT}.pid"

script_result=0

start(){
	[ -x "$PGENGINE/postmaster" ] || exit 5

	PSQL_START=$"Starting ${NAME} service: "

	# Make sure startup-time log file is valid
	if [ ! -e "$PGLOG" -a ! -h "$PGLOG" ]
	then
		touch "$PGLOG" || exit 4
		chown postgres:postgres "$PGLOG"
		chmod go-rwx "$PGLOG"
		[ -x /sbin/restorecon ] && /sbin/restorecon "$PGLOG"
	fi

	# Check for the PGDATA structure
	if [ -f "$PGDATA/PG_VERSION" ] && [ -d "$PGDATA/base" ]
	then
		# Check version of existing PGDATA
		if [ x`cat "$PGDATA/PG_VERSION"` != x"$PGMAJORVERSION" ]
		then
			SYSDOCDIR="(Your System's documentation directory)"
			if [ -d "/usr/doc/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/doc
			fi
			if [ -d "/usr/share/doc/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/share/doc
			fi
			if [ -d "/usr/doc/packages/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/doc/packages
			fi
			if [ -d "/usr/share/doc/packages/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/share/doc/packages
			fi
			echo
			echo $"An old version of the database format was found."
			echo $"You need to upgrade the data format before using PostgreSQL."
			echo $"See $SYSDOCDIR/postgresql-$PGVERSION/README.rpm-dist for more information."
			exit 1
		fi
	else
		# No existing PGDATA! Warn the user to initdb it.
		echo
                echo "$PGDATA is missing. Use \"service postgresql initdb\" to initialize the cluster first."
		echo_failure
		echo
		exit 1
 	fi

	echo -n "$PSQL_START"
	test x"$PG_OOM_ADJ" != x && echo "$PG_OOM_ADJ" > /proc/self/oom_adj
	$SU -l postgres -c "$PGENGINE/postmaster -p '$PGPORT' -D '$PGDATA' ${PGOPTS} &" >> "$PGLOG" 2>&1 < /dev/null
	decounter=${PGSTARTTIMEOUT:-2}
	while true; do
		pid=$(head -n 1 "$PGDATA/postmaster.pid" 2>/dev/null)

		test "x$pid" != x && break

		decounter=$(( decounter - 1 ))
		# pidfile does not exist yet, wait a sec more
		test "$decounter" -ge 0 && sleep 1 && continue
		break
	done

	if [ "x$pid" != x ]
	then
		success "$PSQL_START"
		touch "$lockfile"
		echo $pid > "$pidfile"
		echo
	else
		failure "$PSQL_START"
		echo
		script_result=1
	fi
}

stop(){
	echo -n $"Stopping ${NAME} service: "
	if [ -e "$lockfile" ]
	then
	    $SU -l postgres -c "$PGENGINE/pg_ctl stop -D '$PGDATA' -s -m fast" > /dev/null 2>&1 < /dev/null
	    ret=$? 
	    if [ $ret -eq 0 ]
	    then
		echo_success
		rm -f "$pidfile"
		rm -f "$lockfile"
	    else
		echo_failure
		script_result=1
	    fi
	else
	    # not running; per LSB standards this is "ok"
	    echo_success
	fi
	echo
}

restart(){
    stop
    start
}

condrestart(){
    [ -e "$lockfile" ] && restart || :
}

reload(){
    $SU -l postgres -c "$PGENGINE/pg_ctl reload -D '$PGDATA' -s" > /dev/null 2>&1 < /dev/null
}

initdb(){
    if [ -f "$PGDATA/PG_VERSION" ]
    then
	echo -n "Data directory is not empty!"
	echo_failure
	echo
	script_result=1
    else
	echo -n $"Initializing database: "
	if [ ! -e "$PGDATA" -a ! -h "$PGDATA" ]
	then
		mkdir -p "$PGDATA" || exit 1
		chown postgres:postgres "$PGDATA"
		chmod go-rwx "$PGDATA"
	fi
	# Clean up SELinux tagging for PGDATA
	[ -x /sbin/restorecon ] && /sbin/restorecon "$PGDATA"

	# Make sure the startup-time log file is OK, too
	if [ ! -e "$PGLOG" -a ! -h "$PGLOG" ]
	then
		touch "$PGLOG" || exit 1
		chown postgres:postgres "$PGLOG"
		chmod go-rwx "$PGLOG"
		[ -x /sbin/restorecon ] && /sbin/restorecon "$PGLOG"
	fi

	# Initialize the database
	$SU -l postgres -c "$PGENGINE/initdb --pgdata='$PGDATA' --auth='ident'" >> "$PGLOG" 2>&1 < /dev/null

	# Create directory for postmaster log
	mkdir "$PGDATA/pg_log"
	chown postgres:postgres "$PGDATA/pg_log"
	chmod go-rwx "$PGDATA/pg_log"

	if [ -f "$PGDATA/PG_VERSION" ]
	then
	    echo_success
	else
	    echo_failure
	    script_result=1
	fi
	echo
    fi
}

# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  status)
	status -p "$pidfile" postmaster
	script_result=$?
	;;
  restart)
	restart
	;;
  condrestart|try-restart)
	condrestart
	;;
  reload)
	reload
	;;
  force-reload)
	restart
	;;
  initdb)
	initdb
	;;
  *)
	echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|initdb}"
	exit 2
esac

exit $script_result

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