2010年11月6日星期六

资格认证考试:Linux下简单限制网卡的带宽

  Linux下限制网卡的带宽,可用来模拟服务器带宽耗尽,从而测试服务器在此时的访问效果。
  1、安装iproute
  yum -y install iproute
  2、限制eth0网卡的带宽为50kbit:
  /sbin/tc qdisc add dev eth0 root tbf rate 50kbit latency 50ms burst 1000
  3、限制带宽为50kbit后,在百兆局域网中wget下载一个大文件:
  [[email protected] ~]# wget http://192.168.1.7/test.zip

  --19:40:27-- http://192.168.1.7/test.zip
  Connecting to 192.168.1.7:80... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 23862312 (23M) [application/zip]
  Saving to: `test.zip'
  37% [=======> ] 8,994,816 457K/s eta 27s
  下载速度为457K/s,限制效果达到。
  4、解除eth0网卡的带宽限制:
  /sbin/tc qdisc del dev eth0 root tbf
  5、对比:未作带宽限制情况下,在百兆局域网中wget下载一个大文件:
  [[email protected] ~]# wget http://192.168.1.7/test.zip
  --19:44:33-- http://192.168.1.7/test.zip
  Connecting to 192.168.1.7:80... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 23862312 (23M) [application/zip]
  Saving to: `test.zip'
  100%[==========>] 23,862,312 6.14M/s in 3.7s
  19:44:36 (6.16 MB/s) - `test.zip' saved [23862312/23862312]
  下载速度为6.16MB/s。

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