[root@localhost
yum
.repos.d]# ll
total
56
-rw-r--r--
1
root root
2323
Oct
26
14
:
38
CentOS-
Base.repo
-rw-r--r--
1
root root
1664
Oct
26
14
:
34
CentOS-
Base.repo.bak
-rw-r--r--.
1
root root
1309
Nov
23
2018
CentOS-
CR.repo
-rw-r--r--.
1
root root
649
Nov
23
2018
CentOS-
Debuginfo.repo
-rw-r--r--.
1
root root
314
Nov
23
2018
CentOS-
fasttrack.repo
-rw-r--r--.
1
root root
630
Nov
23
2018
CentOS-
Media.repo
-rw-r--r--
1
root root
998
Dec
11
2018
CentOS-SCLo-
scl.repo
-rw-r--r--
1
root root
971
Oct
29
2018
CentOS-SCLo-scl-
rh.repo
-rw-r--r--.
1
root root
1331
Nov
23
2018
CentOS-
Sources.repo
-rw-r--r--.
1
root root
5701
Nov
23
2018
CentOS-
Vault.repo
-rw-r--r--
1
root root
978
Jun
29
16
:
50
dell-system-
update.repo
-rw-r--r--
1
root root
951
Oct
3
2017
epel.repo
-rw-r--r--
1
root root
1050
Oct
3
2017
epel-testing.repo
三、安装trickle
[root@localhost yum.repos.d]# yum install trickle
四、运行trickle
[root@localhost yum.repos.d]# trickle -help
Usage: trickle [-hvVs] [-d <rate>] [-u <rate>] [-w <length>] [-t <seconds>]
[-l <length>] [-n <path>] command ...
-h Help (this)
-v Increase verbosity level
-V Print trickle version
-s Run trickle in standalone mode independent of trickled
-d <rate> Set maximum cumulative download rate to <rate> KB/s
-u <rate> Set maximum cumulative upload rate to <rate> KB/s
-w <length> Set window length to <length> KB
-t <seconds> Set default smoothing time to <seconds> s
-l <length> Set default smoothing length to <length> KB
-n <path> Use trickled socket name <path>
-L <ms> Set latency to <ms> milliseconds
[root@localhost yum.repos.d]#
-d <rate> 设置最大累计下载速率为 <rate> KB/s
-u <rate> 设置最大累计上传速度为 <rate> KB/s
-w <length> 设置窗口长度为 <length> KB 。默认512KB。
-t <seconds> 设置默认的平滑时间 <seconds> s 。平滑时间决定多少时间间隔trickle将尝试让应用程序传输数据。较小的值(0.1 - 1秒)会导致更连续(平滑)会话,非常适合于交互式应用。而较大的值(1 - 10秒)可能会产生一阵阵的发送和接收数据,对需要大量带宽的应用程序更好。
-l <length> 设置默认的平滑长度 <length> KB 。 默认10 KB。
-n <path> 指定trickled socket名称 <path> 。 默认/tmp/.trickled.sock 。
-L <ms> 设置延时。
Trickle通过控制socket数据读写量来控制和限制应用的上传/下载速度。它使用另一个版本的BSD套接字API，但是区别是trickle还管理socket调用。要注意的是trickle使用动态链接和加载，所以它只对于使用"Glibc库"的程序有用。由于trickle可以设置数据在socket上的传输延迟，所以它可以用来限制一个应用的网络带宽。Trickle不能用于限制使用UDP协议的应用的带宽，它只可用于TCP连接，但是你要知道它也并不是对所有的TCP。
可以通过ldd命令来查看某个应用程序是否使用了libc.so库。如果应用程序使用了这个库,就可以用trickle来限制网络带宽,否则不行
[root@localhost yum.repos.d]# ldd /usr/bin/wget |grep libc.so
libc.so.6 => /lib64/libc.so.6 (0x00007f9231c28000)
[root@localhost yum.repos.d]#
五、限制wget的下载速度为10KB/S
[root@localhost src]# trickle -d 10 wget http://www.keepalived.org/software/keepalived-1.3.4.tar.gz --no-check-certificate
trickle: Could not reach trickled, working independently: No such file or directory
--2021-12-03 11:09:25-- http://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Resolving www.keepalived.org (www.keepalived.org)... 91.121.30.175
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.keepalived.org/software/keepalived-1.3.4.tar.gz [following]
--2021-12-03 11:09:25-- https://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:443... connected.
WARNING: cannot verify www.keepalived.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
Issued certificate has expired.
HTTP request sent, awaiting response... 200 OK
Length: 655420 (640K) [application/octet-stream]
Saving to: ‘keepalived-1.3.4.tar.gz.3’
48% [===========================================> ] 318,981 11.4KB/s eta 29s
可以看到下载速度控制在10KB左右
不使用trickle进行wget下载
[root@localhost src]# wget http://www.keepalived.org/software/keepalived-1.3.4.tar.gz --no-check-certificate
--2021-12-03 11:11:00-- http://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Resolving www.keepalived.org (www.keepalived.org)... 91.121.30.175
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.keepalived.org/software/keepalived-1.3.4.tar.gz [following]
--2021-12-03 11:11:00-- https://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:443... connected.
WARNING: cannot verify www.keepalived.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
Issued certificate has expired.
HTTP request sent, awaiting response... 200 OK
Length: 655420 (640K) [application/octet-stream]
Saving to: ‘keepalived-1.3.4.tar.gz.4’
56% [==================================================> ] 368,133 99.0KB/s eta 4s
下载速度到100KB左右
六、限制一个shell的网络带宽下载10KB/S,上传10KB/S
[root@localhost src]# trickle -d 10 -u 10 -s bash
[root@localhost src]# wget http://www.keepalived.org/software/keepalived-1.3.4.tar.gz --no-check-certificate
--2021-12-03 11:14:15-- http://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Resolving www.keepalived.org (www.keepalived.org)... 91.121.30.175, 2001:41d0:1:71af::1
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.keepalived.org/software/keepalived-1.3.4.tar.gz [following]
--2021-12-03 11:14:15-- https://www.keepalived.org/software/keepalived-1.3.4.tar.gz
Connecting to www.keepalived.org (www.keepalived.org)|91.121.30.175|:443... connected.
WARNING: cannot verify www.keepalived.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
Issued certificate has expired.
HTTP request sent, awaiting response... 200 OK
Length: 655420 (640K) [application/octet-stream]
Saving to: ‘keepalived-1.3.4.tar.gz.5’
18% [===============> ] 122,373 12.4KB/s eta 42s
可以看到限速为10KB左右
