On Wed, 2011-07-20 at 02:21 +0000, Serge E. Hallyn wrote: > Quoting Michael H. Warfield (m...@wittsend.com): > > > > But... I got this for the root system on Alcove. > > > > > > > > 106 55 8:17 /lxc/private/Alcove / rw,relatime master:1 - ext4 /dev/sdb1 > > > > rw,barrier=1,data=ordered > > > > > > > > Ok... That now says "master:1". Not sure what it signifies... > > See linux-2.6/Documentation/filesystems/proc.txt for details: > > shared:X mount is shared in peer group X > master:X mount is slave to peer group X > propagate_from:X mount is slave and receives propagation from peer group X > (*) > unbindable mount is unbindable
> linux-2.6/Documentation/filesystems/sharedsubtree.txt also has good info > (as does fs/namespace.c). Cool. Thanks. That clears that up. Now, another point on the curve. In my containers, I have an ro mounted regular file system that's a bind mount from another directory. In the Alcove container, where I have a double set of bind mounts ala what C Anthony described in an earlier message. In that container, I can remount rw (which I WISH it was not allowed to do, but it is) and then remount back to ro to my hearts content and it never affects the host or the other containers. That WORKS! It just doesn't work for /dev/pts for some reason. In a second container, Plover, which is NOT set up the way C Anthony described, if I set that shared ro mount to rw and then back to ro, the host parent file system is now ro as well. So it did propagate back to the host file system. So what he described seems to be accurate. It's just not working for the special file systems. Also seems like quite a bugger to set up in the host system. Bleah. > -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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