The architecture doc covers some of your questions I believe [1]:
https://github.com/kata-containers/documentation/blob/master/design/architec...
Cheers,
James
[1] - although not all - we need to refresh that doc soon...
Le mer. 4 déc. 2019 à 15:55, Montes, Julio julio.montes@intel.com a écrit :
Hi Stefano
- 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? currently we use VHOST_VSOCK_SET_GUEST_CID to get a unique context ID, is this going to change?
- 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
- Is the agent in the guest running outside a netns (default
init_netns)?
yes
*From:* Stefano Garzarella sgarzare@redhat.com *Sent:* Wednesday, December 4, 2019 4:32 AM *To:* kata-dev@lists.katacontainers.io kata-dev@lists.katacontainers.io *Subject:* [kata-dev] vsock & network namespaces in Kata
Hi folks, I'm working on vsock on Linux and I'm adding the network namespace support on it[1].
The main changes are the following:
- Guest: can talk with the host packets (send and receive packets) in the default init_netns (maybe we can make it configurable)
- Host: can talk with the guest only in the same netns where the VMM is running (e.g. if we start qemu from ns1, all packets are received only in ns1)
- Host: assign the same CID of VMs running in different network namespaces
- Nested VMs (available from Linux 5.5): isolate host applications from guest applications
IIUC you have a runtime running in the host that communicates using vsock with an agent in the guest. I have few questions:
- Is the VMM (e.g. QEMU) running in a network namespace?
- Is the host application, that use vsock to communicate with the guest, running in the same network namespace?
- Is the agent in the guest running outside a netns (default init_netns)?
If you have any other suggestions, I'd be happy to hear them.
Thanks, Stefano
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