A script to check internet connectivity with the node_exporter textfile

internet_check.sh

#!/usr/bin/env sh

URLS[0]="https://www.google.com"
URLS[1]="http://169.254.169.254/metadata/instance?api-version=2020-06-01" # azure internal endpoint

HEADERS[O]=""
HEADERS[1]="-H 'Metadata: true'"

OUTPUT=${OUTPUT:-/tmp/curl.prom}
SLEEP=${SLEEP:-10}

while [ true ]; do
  {
    for i in $(seq 0 $((${#URLS[@]} - 1))); do
      if curl -s -f --connect-timeout 4 -o /dev/null ${HEADERS[$i]} ${URLS[$i]}; then
        echo "node_http_url_reached{url=\"${URLS[$i]}\"} 1"
      else
        echo "node_http_url_reached{url=\"${URLS[$i]}\"} 0"
      fi
    done
  } > ${OUTPUT}

  sleep ${SLEEP}
done