Re: Containernet (Docker/Container Networking) with DPDK?

[Thea Corinne Rossman <thea.rossman@cs.stanford.edu>]

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I'm following up on this to ask a more specific question, since my first
question was a bit all over the place. This is regarding the interplay
between the host and the containers when setting up containers that can run
DPDK applications.

Based on what I've found so far, it looks like I will have to fully
configure DPDK on the host and then mount devices onto each container, even
if there's no need to connect the containers to the outside world. (Is this
correct?) If so, I don't fully understand this, since a container/container
network should be self-contained.

   - Why do we need to set up DPDK on the host? (Why isn't the container
   enough?)
   - Why do we need to set up a DPDK-compatible driver on the host NICs? If
   the containers are on the same machine, exchanging packets, why would the
   host NIC be involved at all? Nothing is going in or out.
   - Why do we need to configure hugepages on the host and then mount them
   on the container? Why can't you just configure this on the containers? Is
   this something that can't be emulated?

Thank you so much again!

On Sun, Nov 17, 2024 at 9:42 PM Thea Corinne Rossman <
thea.rossman@cs.stanford.edu> wrote:

> Hello all!
>
> I'm hoping for some general help getting started with DPDK in a
> Containernet <https://containernet.github.io> topology. I have some DPDK
> experience, but I'm very new to container networking :). I've been working
> with an Ubuntu 24.10 VM, though I can run any experiments on Cloudlab (so
> am not necessarily tied to a particular architecture).
>
> First question: for setting up the host machine: Do I need to install
> DPDK, set up hugepages, etc., on the host, or is configuration in just the
> containers sufficient?
>
> Second question: I'm having trouble creating containers that will let me
> run DPDK applications. High-level, I understand that I'll need to create or
> find a container image that's configured with DPDK and all dependencies, as
> well as the Containernet requirements
> <https://github.com/containernet/containernet/wiki>.
>
> I tried to build on this: https://github.com/shanakaprageeth/docker-dpdk .
> However, when I ran the setup script, I get this error:
>
> ```
> ERROR: failed to solve: process "/bin/sh -c apt-get install
> build-essential git python pciutils vim -y" did not complete successfully:
> exit code: 100
> Unable to find `image 'ubuntu-dpdk:latest' locally
> docker: Error response from daemon: pull access denied for ubuntu-dpdk,
> repository does not exist or may require 'docker login': denied: requested
> access to the resource is denied.
> ```
>
> When I downloaded the image directly from docker (docker pull
> shanakaprageeth/ubuntu-dpdk), no commands on the container worked
> (ifconfig, apt-get, etc.). There was no error message.
>
> I think I fundamentally don't understand how container images work and how
> to customize them, especially since I'm trying to write Containernet
> scripts (vs. actually ssh-ing into containers). I know I'll need a
> container that supports DPDK and has it downloaded, and I know it will also
> need to meet the Containernet requirements.
>
> Could anyone please point me in the right direction?
>
> Thank you!
>

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