haproxy_exporter init script for systemd

haproxy_exporter

#!/bin/sh
### BEGIN INIT INFO
# Provides:          haproxy
# Required-Start:    $local_fs $network $remote_fs $syslog $named $haproxy
# Required-Stop:     $local_fs $remote_fs $syslog $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: fast and reliable load balancing reverse proxy
# Description:       This file should be used to start and stop haproxy.
### END INIT INFO

# Author: Arnaud Cornet <acornet@debian.org>

PATH=/sbin:/usr/sbin:/bin:/usr/bin
BASENAME=haproxy_exporter
PIDFILE=/var/run/${BASENAME}.pid
HAPROXY=/usr/bin/haproxy_exporter
EXTRAOPTS=--haproxy.scrape-uri="http://localhost:9000/haproxy_stats;csv"

test -x $HAPROXY || exit 0

[ -f /etc/default/rcS ] && . /etc/default/rcS
. /lib/lsb/init-functions


haproxy_start()
{
	start-stop-daemon -b --quiet --oknodo --start -m --pidfile "$PIDFILE" \
		--exec $HAPROXY -- $EXTRAOPTS || return 2
	return 0
}

haproxy_stop()
{
	if [ ! -f $PIDFILE ] ; then
		# This is a success according to LSB
		return 0
	fi

	ret=0
	tmppid="$(mktemp)"

	# HAProxy's pidfile may contain multiple PIDs, if nbproc > 1, so loop
	# over each PID. Note that start-stop-daemon has a --pid option, but it
	# was introduced in dpkg 1.17.6, post wheezy, so we use a temporary
	# pidfile instead to ease backports.
	for pid in $(cat $PIDFILE); do
		echo "$pid" > "$tmppid"
		start-stop-daemon --quiet --oknodo --stop \
			--retry 5 --pidfile "$tmppid" --exec $HAPROXY || ret=$?
	done

	rm -f "$tmppid"
	[ $ret -eq 0 ] && rm -f $PIDFILE

	return $ret
}


case "$1" in
start)
	log_daemon_msg "Starting haproxy" "${BASENAME}"
	haproxy_start
	ret=$?
	case "$ret" in
	0)
		log_end_msg 0
		;;
	1)
		log_end_msg 1
		echo "pid file '$PIDFILE' found, ${BASENAME} not started."
		;;
	2)
		log_end_msg 1
		;;
	esac
	exit $ret
	;;
stop)
	log_daemon_msg "Stopping haproxy" "${BASENAME}"
	haproxy_stop
	ret=$?
	case "$ret" in
	0|1)
		log_end_msg 0
		;;
	2)
		log_end_msg 1
		;;
	esac
	exit $ret
	;;
*)
	echo "Usage: /etc/init.d/${BASENAME} {start|stop|reload|restart|status}"
	exit 2
	;;
esac

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