[kata-dev] Networking between containers in qemu processes

Ernst, Eric eric.ernst at intel.com
Wed Nov 20 17:13:50 UTC 2019


Networking should be transparent to you.

If you have standard (runc) containers working but see failures with Kata, then this is an issue.

Can you please verify your setup as a first step?

Eric

On Nov 20, 2019, at 8:41 AM, Al Lau <lauatic at gmail.com> wrote:


Q1. Are these all kata-container VMs
Yes.  These are all kata-containers VMs.

Q2. Are you using some standard container networking infra, like CNI, to link them together?
Yes.  We use the CNI and set up a new bridge plugin in /etc/cni/net.d/ directory.  This is what I have already done.  I'm still debugging the issue I'm facing in getting the VMs to communicate.

Thanks,
Al

On Wed, Nov 20, 2019 at 8:18 AM Whaley, Graham <graham.whaley at intel.com<mailto:graham.whaley at intel.com>> wrote:
I won’t have the answers, but some questions to help clarify…

Q1. Are these all kata-container VMs

Q2. Are you using some standard container networking infra, like CNI, to link them together?

Afaik, kata should ‘just work’ if sat under a CNI setup.

Kata has a number of ways it can discover/config/integrate with the networking passed in from the higher levels – iirc, we default to using ‘tcfilter’ at the moment. Have a look in the config file for some more info.
https://github.com/kata-containers/runtime/blob/master/cli/config/configuration-qemu.toml.in#L378

bottom line is I think, if the higher level orchestration has set up the networking correctly as it would for say ‘runc’, then kata should pick that up and translate/re-configure it into the VM and host side so it works ‘seamlessly’.

Graham

From: Al Lau [mailto:lauatic at gmail.com<mailto:lauatic at gmail.com>]
Sent: Wednesday, November 20, 2019 3:27 PM
To: kata-dev at lists.katacontainers.io<mailto:kata-dev at lists.katacontainers.io>
Subject: [kata-dev] Networking between containers in qemu processes

Hi,
I'm looking for information on how to set up communication between containers running within virtual machines.  On a host, there are multiple VMs with containers and set up networking between the containers in different VMs.

Thanks,
Al

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