On Fri, Feb 14, 2020 at 07:41:30PM +0000, Dr. David Alan Gilbert wrote: > * Vivek Goyal ([email protected]) wrote: > > Hi, > > > > Dan Walsh and Mrunal mentioned that one virtiofsd daemon per exported > > directory requirement sounds excessive. For container use case, they have > > atleast 2-3 more directories they need to export (secrets and /etc/host). > > And > > that means 3-4 virtiofsd running for each kata container. > > > > One option seems that bind mount all exports in one directory and export > > that directory using one virtiofsd. I am aware of atleast one problem > > with that configuraiton and that is possibility of inode number collision > > if bind mounts are coming from different devices. Not sure how many > > applications care though. Sergio is looking into solving this issue. It > > might take a while though. > > I thought the bind mount setup was the normal setup seen under both Kata > and k8s?
Kata Containers works as follows:
kata-runtime manages a bind mount directory for each sandbox VM (k8s
pod) in /run/kata-containers/shared/sandboxes/$VM_ID.
That directory contains the bind-mounted rootfs as well as resolv.conf
and other per-container files.
When volumes (podman run --volume) are present they are also
bind-mounted alongside the rootfs.
So kata-runtime ends up with something like this:
/run/kata-containers/shared/sandboxes/
... 61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385/
... 61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385/
... rootfs/
...
61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385-04b134d40c6255cf-hostname
...
61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385-62cff51b641310e5-resolv.conf
...
61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385-b8dedcdf0c623c40-hosts
...
61c192ae0e7154b6c8ffce6b13c4c5108d6dfe419a508f99ed381d9310268385-d181eeeb4171c3c5-myvolume/
Only one virtio-fs device is used per sandbox VM.
Stefan
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