On Tue, 2011-07-19 at 14:51 -0500, Serge E. Hallyn wrote: > Quoting Michael H. Warfield (m...@wittsend.com): > > On Tue, 2011-07-19 at 12:59 -0500, Serge E. Hallyn wrote: > > > Quoting Michael H. Warfield (m...@wittsend.com): > > > > I think the problem is that you are only doing this on the rootfs and > > > > that flag does not automagically propagate to the submounts. That's > > > > > D'oh! Yeah, what you want is MS_REC | MS_SLAVE. The rest should be fine > > > as I had it? > > > > Well, you still need the patch for /rootfs->path/rootfs->mount/ on the > > second parameter to that mount call. > > > > I gave it a shot. No error on the build or running lxc-start but... No > > joy. A remount,ro still propagates back into the host from the > > container. > > > > Been reading the kernel Documentation/filesystems/sharedsubtree.txt file > > about the SHARED, PRIVATE, and SLAVE semantics and it doesn't sound like > > it does what we think it does. It will stop the propagation of mounts > > themselves from master to slave and vice versa but I don't see anything > > about remounts. I mean, I can see it argued both ways. Well, you're > > not really propagating a mount because it's already mounted. Yeah, but > > it is propagating the mount action. That file is not clear on what > > action would take place in the case of a remount like this. > > > > This comment in section 5a of that file seems to favor the second > > interpretation that shared or private should affect remounts: > > > > == > > A 'propagation event' is defined as event generated on a vfsmount > > that leads to mount or unmount actions in other vfsmounts. > > == > > > > Is a remount a "mount action"? I would presume it is.
> But wait, is your rootfs remounted ro? No. > I thought it was only your devpts on the host? Correct. > In which case it is being propagated as a mount event. Should be, I would think. > -serge Regards, Mike -- Michael H. Warfield (AI4NB) | (770) 985-6132 | m...@wittsend.com /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it!
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