The bind mounts. Since Linux 2.4.0 it is possible to remount part of the file hierarchy somewhere else. The call is mount --bind olddir newdir or shortoption mount -B olddir newdir or fstab entry is: /olddir /newdir none bind After this call the same contents is accessible in two places. One can also remount a single file (on a single file). This call attaches only (part of) a single filesystem, not possible submounts. The entire file hierarchy including submounts is attached a second place using mount --rbind olddir newdir or shortoption mount -R olddir newdir Note that the filesystem mount options will remain the same as those on the origi- nal mount point, and cannot be changed by passing the -o option along with --bind/--rbind. The mount options can be changed by a separate remount command, for example: mount --bind olddir newdir mount -o remount,ro newdir
来源:https://www.cnblogs.com/grj1046/archive/2013/05/13/3076538.html