一、安装epel源
yum install epel-release
二、查看是否安装成功
Complete! [root@localhost ~]# cd /etc/yum.repos.d/ [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
