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mount_namespaces.7: It may be desirable to disable propagation after creating a namespace 

After creating a new mount namespace, it may be desirable to
disable mount propagation. Give the reader a more explicit
hint about this.

Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-10-07 10:50:05 +03:00
parent 0b6cf5d26e
commit a2fc45a9f8
1 changed files with 20 additions and 0 deletions
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man7/mount_namespaces.7
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@ -1077,6 +1077,26 @@ To prevent this, one can use the
option to
.BR unshare (1).
.PP
An application that creates a new mount namespace directly using
.BR clone (2)
or
.BR unshare (2)
may desire to prevent propagation of mount events to other mount namespaces
(as is is done by
.BR unshare (1)).
This can be done by changing the propagation type of
mount points in the new namesapace to either
.BR MS_SLAVE
or
.BR MS_PRIVATE .
using a call such as the following:
.IP
.in +4n
.EX
mount(NULL, "/", MS_SLAVE | MS_REC, NULL);
.EE
.in
.PP
For a discussion of propagation types when moving mounts
.RB ( MS_MOVE )
and creating bind mounts