On 06/16/2017 01:14 PM, Daniel P. Berrange wrote: > On Fri, Jun 16, 2017 at 10:01:26AM +0200, Michal Privoznik wrote: >> Dear list, >> >> while trying to fix a bug of mine, I've realized the mounts are not >> being propagated into qemu namespaces once domains are running. That is, >> imagine you have a domain running and then you plug in a flash disk, >> mount it into host, because you have a file there that you want to >> hotplug as a disk to your domain. You're not hotplugging the whole flash >> disk, but a file on it. Problem is, that the mount event of the flash >> disk is not propagated to qemu namespace even though the root is >> remounted as MS_SLAVE|MS_REC right after the namespace is created. >> >> After some digging. I am able to reproduce this even without libvirt at all: >> >> # mount --make-rshared / >> # mount | grep floppy >> <empty/> >> # unshare -m /bin/bash >> # mount --make-rslave / > > The problem here is your 'unshare' command, which mounts '/' as > private, and it appears the later '--make-rslave' is unable to > undo this. Okay. > > If you use > > unshare -m --propagation slave /bin/sh > > then the example works correctly. Indeed. And now it also does work for libvirt. I don't know what I have been doing wrong yesterday. Thanks! Michal -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
