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I am trying to use the tc command to manipulate traffic on the docker0 interface.

I run the commands

tc qdisc del dev docker0 root
tc qdisc add dev docker0 root handle 1: tbf rate 100mbps burst 1600 limit 1

I believe this is what it does:

  • tbf: Specifies the TBF qdisc to be used.
  • rate 100mbps: Sets the maximum bandwidth rate to 100 Mbps for the docker0 interface.
  • burst 1600: Sets the maximum amount of data that can be transmitted in a single burst to 1600 bytes.
  • limit 1: Limits the token bucket size to 1 token, which limits the amount of data that can be sent at any given time to the burst size.

However, after setting this rule, I can no longer ping containers that are already running and attached to the default docker0 interface. I can also no longer build images that contain commands such as RUN apt-get update -y.

Why is this the case. Can this qdisc configuration not be used alone?

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  • rate 100mbps sets the rate to 100 megaBYTES per second (i.e. 800mbit), and burst 1600 sets the burst rate to 1600 bits per second - that looks odd for a start, and limit specifies the number of bytes that can be queued waiting for tokens to become available - according to documentation May 16, 2023 at 2:05
  • read the answer at unix.stackexchange.com/questions/100785/bucket-size-in-tbf you may find it enlightening May 16, 2023 at 2:13

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