On Sun, Apr 28, 2013 at 4:30 PM, Kevin Wilson <wkevils@xxxxxxxxx> wrote: > Hello, > I posted this question in ubuntu mailing list a few days agoa , but > could not get a solution; I hope to find assistance here since this is > in fact a > filesystem question which is not specific to ubuntu. > > I run Linux 3.5.0-17-generic kernel of in Ubuntu 12.10 > > I try to use mount namespaces with this Ubunutu. > > I opened session 1 on one terminal: > session 1, terminal #1 > mount | grep sda3 > gives nothing. > > unshare -m /bin/bash > mount /dev/sda3 /mnt/sda3 > > mount | grep sda3 > shows > /dev/sda3 on /mnt/sda3 type ext3 (rw) > > readlink /proc/self/ns/mnt > mnt:[4026532114] > > I opened session 2 on a second terminal: > session 2, terminal #2 > In the beginning, > mount | grep sda3 > gives nothing. > > after the mount done on the other terminal (#1, session 1) > mount | grep sda3 > /dev/sda3 on /mnt/sda3 type ext3 (rw) > readlink /proc/self/ns/mnt > mnt:[4026531840] > so this is a different namespace then session 1. > And AFAIK I should not have seen ext3 mounted in this namespace. You have to mark your mount-tree as private first. Otherwise new mounts will get propagated. On systemd distros the tree is automatically marked as private. AFAIK systemd does mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL) at the very beginning. ...no idea what ubuntu/upstart does... -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
