Dynamically adjusting bandwidth limits

3.10.2020

Full quote by Perry:

“I got a request from a refugee center to set up qos so that in the evenings and on weekends the bandwidth-limit gets raised from 35Mbit to 45Mbit, and back down to 35Mbit Mon-Fri 7:00 to 20:00. To do this, I did the following. It’s a hack, which could be improved (like storing up slow speed and fast speed in a config file somewhere).

So this is what I did…. I wrote the following script (/root/qos-schedule.sh)

#!/bin/sh

. /lib/functions.sh

SLOW=35000
FAST=45000

SPEED=$SLOW

#check to see if it's the weekend
if [[ $(date +%u) -gt 5 ]]; then
  SPEED=$FAST
else
  # check to see if it's not between 7:00 and 20:00
  if [[ $(date +%H) -lt 7 ]] || [[ $(date +%H) -ge 20 ]]; then
    SPEED=$FAST
  fi
fi

#compare the speed to the current settings.
OLDSPEED=$(uci get qos.ffuplink.download)
if [[ $OLDSPEED -ne $SPEED ]]; then
  logger -t qos-schedule.sh "setting time-based qos to $SPEED"
  uci set qos.ffuplink.download=$SPEED
  uci commit qos
  /etc/init.d/qos reload
fi

I added it to crontab to run every hour

Additionally I added the script to /etc/rc.local (so that the correct speed is set at startup)

Additionally I created a hotplug script /etc/hotplug.d/ntp/50-qos-schedule

#!/bin/sh

#logger -t hotplug-ntp-qos-schedule "Action is $ACTION, stratum is $stratum"
[ "$ACTION" = stratum ] || exit 0

logger -t hotplug-ntp-qos-schedule "Running qos-schedule from ntp hotplug event"
/root/qos-schedule.sh

Lastly, I added /root/qos-schedule.sh and /etc/hotplug.d/ntp/50-qos-schedule to /etc/sysupgrade.conf

kls0e Would you like to add that to your list of super cool tutorials?”

absolutely.

kls0e hi :-)

Dynamically adjusting bandwidth limits