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{
  "watches": [
    {
      "name": "ntpd-restart",
      "type": "event",
      "handler": "/var/consul_scripts/handler-ntpd-restart.sh"
    }
  ]
}

# Add below lines
Defaults:consul !requiretty
consul ALL=(root) /sbin/service ntpd restart

response=$(cat -)
payload=$(echo $response | sed -e 's/^.*"Payload":"\([^"]*\)".*$/\1/')
# action string "runme" == byte "cnVubWU=" , replace "runme" with your payload data

if [ "$payload" == "cnVubWU=" ]; then
  logger restarting ntpd, consul triggered by payload $payload
  # /usr/bin/sudo /sbin/service ntpd restart
else
  logger skipping ntpd restart, consul triggered by payload $payload
fi