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Linux Containers - /proc mounting and other queries

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Top Forums UNIX for Beginners Questions & Answers Linux Containers - /proc mounting and other queries
# 8  
Old 12-08-2018
--- Post updated at 12:41 PM ---

Quote:
Originally Posted by MadeInGermany
The filesystem driver can deny a second mount. But in fact ext3, ext4, xfs allow mutiple primary mounts.
Code:
# ls -ldi /boot /mnt
     2 drwxr-xr-x  4 root root 3072 May 24  2014 /boot
260609 drwxr-xr-x  5 root root 4096 Sep 25 11:40 /mnt
# df /boot
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1               101146     37017     58907  39% /boot
# mount /dev/sda1 /mnt
# ls -ldi /boot /mnt
2 drwxr-xr-x  4 root root 3072 May 24  2014 /boot
2 drwxr-xr-x  4 root root 3072 May 24  2014 /mnt
# mount | grep /dev/sda1
/dev/sda1 on /boot type ext3 (rw)
/dev/sda1 on /mnt type ext3 (rw)
# umount /mnt

The same exercise with a bind mount:
Code:
# mount --bind /boot /mnt
# ls -ldi /boot /mnt
2 drwxr-xr-x  4 root root 3072 May 24  2014 /boot
2 drwxr-xr-x  4 root root 3072 May 24  2014 /mnt
# mount | grep /dev/sda1
/dev/sda1 on /boot type ext3 (rw)
# mount | grep /mnt
/boot on /mnt type none (rw,bind)
# umount /mnt

Yes but how is a bind mount different from a normal mount?

According to this question on SO

Bind mounts reflect the directory structure from the source and does not allow modifications on the disk. Its suppose to be part of the live filesystem. But then my question is what is the difference between a normal mount?

Does this question about bind mounts deserve its own personal thread?

Your example just shows the type as none and an extra attribute as bind in the mount. What does this imply?
# 9  
Old 12-11-2018
In which cases would a bind mount be beneficial? I mean why would you want to use it?
# 10  
Old 12-11-2018
When you want to put a filesystem in several different places in a manner which doesn't depend on symbolic links.

Imagine a chroot for example. A symbolic link to outside the chroot would be pretty useless. A bind mount would still work.
# 11  
Old 12-12-2018
A bind mount works with any directory, not just with mount points.
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