一、安裝epel源
yum install epel-release
二、查看是否安裝成功
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、安裝trickle
[root@localhost yum.repos.d]# yum install trickle
四、運行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> 設置最大累計下載速率為 <rate> KB/s
-u <rate> 設置最大累計上傳速度為 <rate> KB/s
-w <length> 設置窗口長度為 <length> KB 。默認512KB。
-t <seconds> 設置默認的平滑時間 <seconds> s 。平滑時間決定多少時間間隔trickle將嘗試讓應用程序傳輸數據。較小的值(0.1 - 1秒)會導致更連續(平滑)會話,非常適合於交互式應用。而較大的值(1 - 10秒)可能會產生一陣陣的發送和接收數據,對需要大量帶寬的應用程序更好。
-l <length> 設置默認的平滑長度 <length> KB 。 默認10 KB。
-n <path> 指定trickled socket名稱 <path> 。 默認/tmp/.trickled.sock 。
-L <ms> 設置延時。
Trickle通過控制socket數據讀寫量來控制和限制應用的上傳/下載速度。它使用另一個版本的BSD套接字API，但是區別是trickle還管理socket調用。要注意的是trickle使用動態鏈接和加載，所以它只對於使用"Glibc庫"的程序有用。由於trickle可以設置數據在socket上的傳輸延遲，所以它可以用來限制一個應用的網絡帶寬。Trickle不能用於限制使用UDP協議的應用的帶寬，它只可用於TCP連接，但是你要知道它也並不是對所有的TCP。
可以通過ldd命令來查看某個應用程序是否使用了libc.so庫。如果應用程序使用了這個庫,就可以用trickle來限制網絡帶寬,否則不行
[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的下載速度為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
可以看到下載速度控制在10KB左右
不使用trickle進行wget下載
[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
下載速度到100KB左右
六、限制一個shell的網絡帶寬下載10KB/S,上傳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
可以看到限速為10KB左右