hostalive.sh

#!/usr/bin/env nix-shell
#!nix-shell -p fping -i bash

while true; do
arp -an | grep -v incomplete | cut -f2 -d" "|  egrep -o '[0-9]+.[0-9]+.[0-9]+.[0-9]+'  | sudo fping  -C 30 -D -n -r 0  | tr -d '[]()' | awk '{ print $1, $2, $7 }' |
  while read -e line; do
    ts=$(echo $line | awk '{ print $1 }' | tr -d '.')000
    host=$(echo $line | awk '{ print $2 }' | tr . _ )
    ms=$(echo $line | awk '{ print $3 }' )

    curl -X POST 'http://ogre.mad.hubns.net:8086/write?db=mad' \
      --data-binary "latency,hostname=$(hostname),pingtarget=$host value=$ms $ts"
  done
done