Stefano,
Do you think could be an easy change in the Kata runtime?
I need to look better, but if you already know the answer you'll save me some time :)
ok, this means all kata components must be in the same network namespace.
fortunately, kata-shim and qemu run in the same network namespace, so the change should be easy, just move kata-proxy and kata-runtime into the same net namespace
________________________________ From: Stefano Garzarella sgarzare@redhat.com Sent: Wednesday, December 4, 2019 11:05 AM To: Montes, Julio julio.montes@intel.com Cc: kata-dev@lists.katacontainers.io kata-dev@lists.katacontainers.io Subject: Re: [kata-dev] vsock & network namespaces in Kata
On Wed, Dec 04, 2019 at 03:54:06PM +0000, Montes, Julio wrote:
Hi Stefano
Hi Julio
- Host: assign the same CID of VMs running in different network
namespaces
this means two VMs running in different namespace can use the same CID?
Exactly.
currently we use VHOST_VSOCK_SET_GUEST_CID to get a unique context ID, is this going to change?
The only change is that the CID is unique in the network namespace domain.
- Is the VMM (e.g. QEMU) running in a network namespace?
yes, see https://github.com/kata-containers/runtime/blob/62cd08044d78912228d9dc800cb1...
- Is the host application, that use vsock to communicate with the
guest, running in the same network namespace?
afaik, no
This could be a problem with the RFC that I sent, because we allow only the processes in the same netns of the VMM, to communicate with the guest.
Do you think could be an easy change in the Kata runtime? I need to look better, but if you already know the answer you'll save me some time :)
- Is the agent in the guest running outside a netns (default init_netns)?
yes
This is nice.
Thank you very much, Stefano