node exporter setup

node_exporter.init.d

#!/bin/sh
#
# /etc/init.d/node_exporter -- startup script for node_exporter
#
# Written by Michael Knurr
#
### BEGIN INIT INFO
# Provides:          Node exporter
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       Node exporter for prometheus 
### END INIT INFO

DAEMON=/opt/node_exporter
NAME=node_exporter
USER=monitoring
PIDFILE=/var/run/$NAME.pid
LOGFILE=/var/log/$NAME.log

ARGS=""
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

do_start_prepare()
{
    mkdir -p `dirname $PIDFILE` || true
    mkdir -p `dirname $LOGFILE` || true
    chown -R $USER: `dirname $LOGFILE`
    chown -R $USER: `dirname $PIDFILE`
}

do_start_cmd()
{
    do_start_prepare
    echo -n "Starting daemon: "$NAME
	start-stop-daemon --chuid $USER -C --background --start --quiet --pidfile $PIDFILE --make-pidfile --exec $DAEMON -- $ARGS >> $LOGFILE 2>&1
	echo "."
}

do_stop_cmd()
{
    echo -n "Stopping daemon: "$NAME
	start-stop-daemon --stop --quiet --oknodo --pidfile $PIDFILE
	rm $PIDFILE
    echo "."
}

status() {
        printf "%-50s" "Checking $NAME..."
    if [ -f $PIDFILE ]; then
        PID=$(cat $PIDFILE)
            if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
                printf "%s\n" "The process appears to be dead but pidfile still exists"
            else    
                echo "Running, the PID is $PID"
            fi
    else
        printf "%s\n" "Service not running"
    fi
}


case "$1" in
  start)
    do_start_cmd
    ;;
  stop)
    do_stop_cmd
    ;;
  status)
    status
    ;;
  restart)
    stop
    start
    ;;
  *)
    echo "Usage: $1 {start|stop|status|restart}"
    exit 1
esac

exit 0

setup_node_exporter.sh

#!/bin/bash
##########################
#
# Setup for node exporter
#
##########################

EXPORTER_RUNNING=`ps -ef|grep -v grep|grep -v setup_node_exporter.sh| grep node_exporter|wc -l`
if [ $EXPORTER_RUNNING -gt 0 ] ; then
        echo "Node exporter already running, exiting."
        exit 1;
fi

VERSION=0.15.2
EXPORTER_NAME=node_exporter-$VERSION.linux-amd64


cd /opt
wget https://github.com/prometheus/node_exporter/releases/download/v$VERSION/$EXPORTER_NAME.tar.gz
tar xzf $EXPORTER_NAME.tar.gz
rm $EXPORTER_NAME.tar.gz
useradd monitoring
chown -R monitoring:monitoring /opt/$EXPORTER_NAME/
if [ -x /opt/node_exporter ] ; then
        rm /opt/node_exporter
fi
ln -s $EXPORTER_NAME node_exporter

wget https://gist.githubusercontent.com/michaelknurr/9b9540c10692e1a5a1a1d39c2064155a/raw/a5a190a1c0a83dd5a6bdb15573dcadd975d69233/node_exporter.init.d
mv node_exporter.init.d /etc/init.d/node_exporter
chmod a+x /etc/init.d/node_exporter
echo "[Unit]
Description=Node Exporter

[Service]
User=monitoring
ExecStart=/opt/node_exporter/node_exporter

[Install]
WantedBy=default.target" > /etc/systemd/system/node_exporter.service
systemctl daemon-reload
systemctl start node_exporter
systemctl enable node_exporter