linux环境下，利用tc限制两台服务器间的网速，非常简单。

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最近再搞postgres的数据同步，需要模拟异地机房有带宽限制时的同步效果，所以想要限制一下两台机器之间的网速。

ts命令功能很强，同时也好难理解和使用，经常浪费了好半天还是搞不定。

这里分享一个简单好用的脚本，只要设置一下目标ip和需要限制的速率，执行下就可以了：

#!/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 bit
#
TC=/sbin/tc
IF=eth0 # 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 : htb default
$TC class add dev $IF parent : classid : htb rate $DNLD
$TC class add dev $IF parent : classid : htb rate $UPLD
$U32 match ip dst $IP/ flowid :
$U32 match ip src $IP/ flowid :}stop() { $TC qdisc del dev $IF root}restart() { stop
sleep
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}"
;;esacexit