Node_exporter: SysV Init script for older systems

[prologic]

I had to add something like this to an old Scientific Linux 6.7 system:

```#!bash

!/bin/bash

#

node_exporter Start up the Node Exporter daemon

#

chkconfig: 345 70 30

description: node_exporter is a Prometheus system metrics exporter

processname: node_exporter

source function library

. /etc/rc.d/init.d/functions

pull in sysconfig settings

[ -f /etc/sysconfig/node_exporter ] && . /etc/sysconfig/node_exporter

RETVAL=0
prog="node_exporter"
lockfile=/var/lock/subsys/$prog

Some functions to make the below more readable

USER=node_exporter
PID_FILE=/var/run/node_exporter.pid
NODE_EXPORTER=/usr/local/bin/node_exporter

runlevel=$(set -- $(runlevel); eval "echo \$$#" )

start()
{
[ -x $NODE_EXPORTER ] || exit 5

echo -n $"Starting $prog: "
daemonize -u $USER -p $PID_FILE -l $lockfile $NODE_EXPORTER $OPTIONS && success || failure
RETVAL=$?
[ $RETVAL -eq 0 ] && touch $lockfile
echo
return $RETVAL

}

stop()
{
echo -n $"Stopping $prog: "
killproc -p $PID_FILE $NODE_EXPORTER
RETVAL=$?
[ $RETVAL -eq 0 ] && rm -f $lockfile
echo
}

reload()
{
echo -n $"Reloading $prog: "
killproc -p $PID_FILE $NODE_EXPORTER -HUP
RETVAL=$?
echo
}

restart() {
stop
start
}

force_reload() {
restart
}

rh_status() {
status -p $PID_FILE openssh-daemon
}

rh_status_q() {
rh_status >/dev/null 2>&1
}

case "$1" in
start)
rh_status_q && exit 0
start
;;
stop)
if ! rh_status_q; then
rm -f $lockfile
exit 0
fi
stop
;;
restart)
restart
;;
reload)
rh_status_q || exit 7
reload
;;
force-reload)
force_reload
;;
condrestart|try-restart)
rh_status_q || exit 0
if [ -f $lockfile ] ; then
do_restart_sanity_check
if [ $RETVAL -eq 0 ] ; then
stop
# avoid race
sleep 3
start
else
RETVAL=6
fi
fi
;;
status)
rh_status
RETVAL=$?
if [ $RETVAL -eq 3 -a -f $lockfile ] ; then
RETVAL=2
fi
;;
*)
echo $"Usage: $0 {start|stop|restart|reload|force-reload|condrestart|try-restart|status}"
RETVAL=2
esac
exit $RETVAL
```

[SuperQ]

It would be interesting to add RPM/DEB building to promu. Something like fpm should be able to automatically generate this kind of thing.

Any interest in contributing this feature?

[astral303]

You can generate this script yourself using pleaserun:

pleaserun --install-prefix /tmp -p sysv -v lsb-3.1 --name node_exporter /usr/local/bin/node_exporter

Then write a /etc/sysconfig/node_exporter file with the contents:

args="--collectors.enabled etc --and --other --args"

[discordianfish]

Since the node-exporter doesn't need any special setup, I don't think it makes much sense to include a sysv script that might need (small but still) ongoing maintenance.
As @SuperQ said, if we want to add something like that, it should be done on the build infrastructure level so it works for all prometheus projects.

[m934030039]

Since the node-exporter doesn't need any special setup, I don't think it makes much sense to include a sysv script that might need (small but still) ongoing maintenance.
As @SuperQ said, if we want to add something like that, it should be done on the build infrastructure level so it works for all prometheus projects.

Agree with you.