On Tue, 26 May 2020 at 10:50, Karel Zak <kzak@xxxxxxxxxx> wrote: > > On Mon, May 25, 2020 at 03:13:18PM +0200, Michael Kerrisk (man-pages) wrote: > > A follow-up question. There was one piece of the unshare(1) examples > > that I did not try to rework, because I simply don't understand it: > > v > > Establish a persistent mount namespace referenced by the bind > > mount /root/namespaces/mnt. This example shows a portable solu‐ > > tion, because it makes sure that the bind mount is created on a > > shared filesystem. > > > > # mount --bind /root/namespaces /root/namespaces > > # mount --make-private /root/namespaces > > # touch /root/namespaces/mnt > > # unshare --mount=/root/namespaces/mnt > > > > I think you wrote this example. What does the sentence "This example shows > > a portable solution, because it makes sure that the bind mount is created > > on a shared filesystem" mean? I think this needs clarification, and I'd try > > to do so, but it's not clear to me what the sentence is trying to say. > > Hmm... it should be "the /root/namespaces/mnt is on a private > filesystem". The important thing is --make-private in this case, > because for example on Fedora we use "shared" propagation flag for > root FS and without bind + make-private you will be unsuccessful. The > example makes it portable between distros. Okay -- I'll send a patch, once the curent queue of patches I have with you is cleared. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
