Debian /etc/init.d launch script for pgpool. Tested on Ubuntu 14.04 LTS (at Amazon EC2)

pgpool2_etc_init.d_debian

#! /bin/sh

### BEGIN INIT INFO
# Provides:          pgpool2
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      postgresql
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: start pgpool-II
# Description: pgpool-II is a connection pool server and replication
#              proxy for PostgreSQL.
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/sbin/pgpool
DAEMONUSER=${DAEMONUSER:-postgres}
PIDFILE=/var/run/postgresql/pgpool.pid

test -x $DAEMON || exit 5

# Include pgpool defaults if available
if [ -f /etc/default/pgpool2 ] ; then
	. /etc/default/pgpool2
fi

OPTS=""
if [ x"$PGPOOL_LOG_DEBUG" = x"yes" ]; then
	OPTS="$OPTS -d"
fi

. /lib/lsb/init-functions

# This verifies the existence of numactl as well as testing that the command works
NUMACTL_ARGS="--interleave=all"
if which numactl >/dev/null 2>/dev/null && numactl $NUMACTL_ARGS ls / >/dev/null 2>/dev/null
then
    NUMACTL="`which numactl` -- $NUMACTL_ARGS"
    DAEMON_OPTS=${DAEMON_OPTS:-"-n"}
else
    NUMACTL=""
    DAEMON_OPTS="-- "${DAEMON_OPTS:-"-n"}
fi

is_running() {
    # Check if the process is running looking at /proc
    # (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return 1
    pid=`cat $PIDFILE`
    running_pid $pid $DAEMON || return 1
    return 0
}

running_pid() {
    # Check if a given process pid's cmdline matches a given name
    pid=$1
    name=$2
    [ -z "$pid" ] && return 1
    [ ! -d /proc/$pid ] &&  return 1
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n"|head -n 1 |cut -d : -f 1`
    # Is this the expected server
    [ "$cmd" != "$name" ] &&  return 1
    return 0
}


d_start() {
	# Start the process using the wrapper
        sudo -u $DAEMONUSER start-stop-daemon --background --start \
                    --pidfile $PIDFILE \
                    --make-pidfile --chuid $DAEMONUSER \
                    --exec $NUMACTL $DAEMON $DAEMON_OPTS
         errcode=$?
	return $errcode
}


d_stop() {
     start-stop-daemon --stop --pidfile $PIDFILE \
               --retry 300 \
               --user $DAEMONUSER \
               --exec $DAEMON
            errcode=$?
     return $errcode
}


case "$1" in
    start)
	log_daemon_msg "Starting pgpool-II" pgpool
	d_start
	log_end_msg $?
	;;
    stop)
	log_daemon_msg "Stopping pgpool-II" pgpool
	d_stop
	log_end_msg $?
	;;
    status)
	is_running
	status=$?
	if [ $status -eq 0 ]; then
		log_success_msg "pgpool-II is running."
	else
		log_failure_msg "pgpool-II is not running."
	fi
	exit $status
	;;
    restart|force-reload)
	log_daemon_msg "Restarting pgpool-II" pgpool
	d_stop && sleep 1 && d_start
	log_end_msg $?
	;;
    try-restart)
	if $0 status >/dev/null; then
		$0 restart
	else
		exit 0
	fi
	;;
    reload)
	exit 3
	;;
    *)
	log_failure_msg "Usage: $0 {start|stop|status|restart|try-restart|reload|force-reload}"
	exit 2
	;;
esac