Hi Everyone,
I'm try to use the script below to throttle a Xen VM. However, it's not
working. The script does seem to execute ok though. All my Xen DomU
interfaces are connected to a bridge on the Xen host. I have a firewall
VM running on this machine which the VMs use. No matter if I put the VM
interface, the firewall interface, or the bridge name itself in the IF
field, it never works. Any help is appreciated. Thanks
#!/bin/bash
#
# tc uses the following units when passed as a parameter.
# kbps: Kilobytes per second
# mbps: Megabytes per second
# kbit: Kilobits per second
# mbit: Megabits per second
# bps: Bytes per second
# Amounts of data can be specified in:
# kb or k: Kilobytes
# mb or m: Megabytes
# mbit: Megabits
# kbit: Kilobits
# To get the byte figure from bits, divide the number by 8 bit
#
TC=/sbin/tc
IF=tap1.0 # Interface
DNLD=1mbit # DOWNLOAD Limit
UPLD=1mbit # UPLOAD Limit
IP=216.3.128.12 # Host IP
U32="$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32"
start() {
$TC qdisc add dev $IF root handle 1: htb default 30
$TC class add dev $IF parent 1: classid 1:1 htb rate $DNLD
$TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD
$U32 match ip dst $IP/32 flowid 1:1
$U32 match ip src $IP/32 flowid 1:2
}
stop() {
$TC qdisc del dev $IF root
}
restart() {
stop
sleep 1
start
}
show() {
$TC -s qdisc ls dev $IF
}
case "$1" in
start)
echo -n "Starting bandwidth shaping: "
start
echo "done"
;;
stop)
echo -n "Stopping bandwidth shaping: "
stop
echo "done"
;;
restart)
echo -n "Restarting bandwidth shaping: "
restart
echo "done"
;;
show)
echo "Bandwidth shaping status for $IF:\n"
show
echo ""
;;
*)
pwd=$(pwd)
echo "Usage: $(/usr/bin/dirname $pwd)/tc.bash {start|stop|restart|show}"
;;
esac
exit 0
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