How to Create bind-mounts On CentOS 7.6

Creation of Bind-Mounts On CentOS 7.6

Procedure:

Check the version of CentOS 7.6

[root@linuxhelp1 ~]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core) 

Navigate to a directory to which you want to create a bind-mount.

[root@linuxhelp1 ~]# cd /mnt

Create two directories where use one as source and two as a bind-mount

[root@linuxhelp1 mnt]# mkdir one two

Change the directory to one and Create files

[root@linuxhelp1 mnt]# cd one
[root@linuxhelp1 one]# touch files{1..6}

Create the bind-mount as follows

[root@linuxhelp1 one]# mount --bind /mnt/one /mnt/two

List the contents In the one directory

[root@linuxhelp1 one]# ls -la
total 0
drwxr-xr-x  2 root root 90 Dec 27 08:47 .
drwxr-xr-x. 4 root root 28 Dec 27 08:47 ..
-rw-r--r--  1 root root  0 Dec 27 08:47 files1
-rw-r--r--  1 root root  0 Dec 27 08:47 files2
-rw-r--r--  1 root root  0 Dec 27 08:47 files3
-rw-r--r--  1 root root  0 Dec 27 08:47 files4
-rw-r--r--  1 root root  0 Dec 27 08:47 files5
-rw-r--r--  1 root root  0 Dec 27 08:47 files6

Verify the bind-mount directory where it has source content

[root@linuxhelp1 one]# cd /mnt/two
[root@linuxhelp1 two]# ls -la
total 0
drwxr-xr-x  2 root root 90 Dec 27 08:47 .
drwxr-xr-x. 4 root root 28 Dec 27 08:47 ..
-rw-r--r--  1 root root  0 Dec 27 08:47 files1
-rw-r--r--  1 root root  0 Dec 27 08:47 files2
-rw-r--r--  1 root root  0 Dec 27 08:47 files3
-rw-r--r--  1 root root  0 Dec 27 08:47 files4
-rw-r--r--  1 root root  0 Dec 27 08:47 files5
-rw-r--r--  1 root root  0 Dec 27 08:47 files6

To check the bind-mounts,navigate to the following location

[root@linuxhelp1 two]# vim /etc/mtab
/dev/sda3 /mnt/two xfs rw,relatime,attr2,inode64,noquota 0 0

Unbind the mount as follows

[root@linuxhelp1 two]# cd ..
[root@linuxhelp1 mnt]# umount -l /mnt/two

Verify the bind-mount directory where the contents of the source directory is removed

[root@linuxhelp1 mnt]# cd two
 [root@linuxhelp1 two]# ls -la
total 0
drwxr-xr-x  2 root root  6 Dec 27 08:47 .
drwxr-xr-x. 4 root root 28 Dec 27 08:47 ..

Verify the bind-mount entry in mtab

[root@linuxhelp1 two]# cat /etc/mtab | tail -2
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sr0 /run/media/root/CentOS\0407\040x86_64 iso9660 ro,nosuid,nodev,relatime,uid=0,gid=0,iocharset=utf8,mode=0400,dmode=0500 0 0

From the above result,the bind-mount has been successfully detached.

With this,the method to create a bind-mount on CentOS 7.6 comes to an end