you need at least XSLOVZ v1.1 (download from here) then go to your configurable options group related to XSLOVZ module . and create 2 new configurable options as per below screenshot :
last thing make sure to hide them so that only your staff can change them .
also if your main node interface is not eth0 then you have to specify the name of your interface in your server config like below :
now if you want to limit the traffic of a specific container go to that container and change both incoming/outgoing traffic to suite your needs, Save changes then hit Limit Traffic .
to enable feature you need to enable /sbin/tc in sudo (kindly check this tutorial to see how to do it)
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