linux环境下，利用tc限制两台服务器间的网速，非常简单。

时间：2021-10-08 01:46:52

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}"

    ;;

esac

exit

原文地址：http://www.iplocation.net/tools/traffic-control.php

脚本地址：http://www.iplocation.net/tc.bash.txt

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