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I have multiple users on a server. They upload and download their files through FTP. Sometimes some heavy transfer causes high load on the server. I am wondering, if there is any way to limit the ftp speed to avoid high load.

Any help would be much appreciated.

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    Some FTP servers have builtin support for that. Which is yours? Is CPU, network bandwith or disk access bandwidth the issue here? You could also nice and ionice -c 3 your FTP server.
    – Stéphane Chazelas
    Sep 18, 2012 at 13:21

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The keyword is bandwidth management and the Linux Kernel has direct support of it. I dealed with this long time ago and have forgotten much about that but there is a great online book that covers the topic extensively. It's called

To get a foretaste of what you want to achieve take a look at

Perhaps there are (software) servers which support bandwidth control directly!?

Supplement:

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I found a way to limit ftp speed:

In the /etc/proftpd.conf insert this line:

TransferRate RETR,STOR,APPE,STOU 2000

This will limit ftp speed to 2 megabyte per second.

After changing the file you should restart the proftpd service:

/etc/init.d/proftpd restart
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    I know this is old but hopefully it helps anyone who finds it. The answer above is 100% correct, but can be slightly misleading. Be aware of this when using this directive. Online Manual Page From proftpd's configuration directives document page, in the Description section. > Note that this limit only applies to a single connection, and not to the overall transfer rate of the server.
    – MPH426
    Nov 2, 2016 at 13:27

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