How to create a bind-mount on Oracle Linux 9.3

To Create Bind-Mounts On Oracle Linux 9.3

Introduction:

A bind mount allows us to mount a file system or a subset of a file system in two places at once. They can be used for different reasons when parts of the file system need to be made available in various locations.

Procedure:

Step 1: Check the version of by using the below Command.

[root@linuxhelp ~]# cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="9.3"
ID="ol"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="9.3"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Oracle Linux Server 9.3"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:9:3:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://github.com/oracle/oracle-linux"
ORACLE_BUGZILLA_PRODUCT="Oracle Linux 9"
ORACLE_BUGZILLA_PRODUCT_VERSION=9.3
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=9.3

Step 2: Navigate to a directory to which you want to create a bind-mount by using the below Command.

[root@linuxhelp ~]# cd /mnt/

Step 3: Create two directories where use one as source and two as a bind-mount by using the below Command

[root@linuxhelp mnt]# mkdir test1 test2
[root@linuxhelp mnt]# ll
total 0
drwxr-xr-x. 2 root root 6 Jan  7 02:50 hgfs
drwxr-xr-x. 2 root root 6 Apr 28 22:21 test1
drwxr-xr-x. 2 root root 6 Apr 28 22:21 test2

Step 4: Change the directory and Create files by using the below Command

[root@linuxhelp mnt]# cd test1
[root@linuxhelp test1]# touch files{1..6}
[root@linuxhelp test1]# ll
total 0
-rw-r--r--. 1 root root 0 Apr 28 22:21 files1
-rw-r--r--. 1 root root 0 Apr 28 22:21 files2
-rw-r--r--. 1 root root 0 Apr 28 22:21 files3
-rw-r--r--. 1 root root 0 Apr 28 22:21 files4
-rw-r--r--. 1 root root 0 Apr 28 22:21 files5
-rw-r--r--. 1 root root 0 Apr 28 22:21 files6

Step 5: Create the bind-mount by using the below Command

[root@linuxhelp test1]# mount --bind /mnt/test1 /mnt/test2/
[root@linuxhelp test1]# cd ../test2/

Step 6: List the contents in the directory by using the below Command

[root@linuxhelp test2]# ll
total 0
-rw-r--r--. 1 root root 0 Apr 28 22:21 files1
-rw-r--r--. 1 root root 0 Apr 28 22:21 files2
-rw-r--r--. 1 root root 0 Apr 28 22:21 files3
-rw-r--r--. 1 root root 0 Apr 28 22:21 files4
-rw-r--r--. 1 root root 0 Apr 28 22:21 files5
-rw-r--r--. 1 root root 0 Apr 28 22:21 files6

Step 7: Check the bind-mounts, navigate to the following location by using the below Command

[root@linuxhelp test2]# vim /etc/mtab
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs rw,seclabel,nosuid,size=4096k,nr_inodes=432915,mode=755,inode64 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,seclabel,nosuid,nodev,inode64 0 0
devpts /dev/pts devpts rw,seclabel,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,seclabel,nosuid,nodev,size=706108k,nr_inodes=819200,mode=755,inode64 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,seclabel,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,seclabel,nosuid,nodev,noexec,relatime 0 0
bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
/dev/mapper/ol_linuxhelp-root / xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,nosuid,noexec,relatime 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12869 0 0
mqueue /dev/mqueue mqueue rw,seclabel,nosuid,nodev,noexec,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,seclabel,relatime,pagesize=2M 0 0
debugfs /sys/kernel/debug debugfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/tracing tracefs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
vmware-vmblock /run/vmblock-fuse fuse.vmware-vmblock rw,relatime,user_id=0,group_id=0,default_permissions,allow_other 0 0
none /run/credentials/systemd-sysctl.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
none /run/credentials/systemd-sysusers.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
none /run/credentials/systemd-tmpfiles-setup-dev.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
/dev/nvme0n1p1 /boot xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
none /run/credentials/systemd-tmpfiles-setup.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
tmpfs /run/user/1000 tmpfs rw,seclabel,nosuid,nodev,relatime,size=353052k,nr_inodes=88263,mode=700,uid=1000,gid=1000,inode64 0 0
gvfsd-fuse /run/user/0/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=0,group_id=0 0 0
/dev/mapper/ol_linuxhelp-root /mnt/test2 xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0

Step 8: Unbind the mount by using the below Command

[root@linuxhelp test2]# cd ..
[root@linuxhelp mnt]# umount -l /mnt/test2

Step 9: Verify the bind-mount directory where the contents of the source directory is removed by using the below Command

[root@linuxhelp mnt]# cd test2/
[root@linuxhelp test2]# ls -la
total 0
drwxr-xr-x. 2 root root  28 Apr 24 20:45 .
drwxr-xr-x. 5 root root 28 Apr 24 20:45 ..

Step 10: Finally verify the bind-mount entry in mtab by using the below Command

[root@linuxhelp test2]# cat /etc/mtab
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs rw,seclabel,nosuid,size=4096k,nr_inodes=432915,mode=755,inode64 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,seclabel,nosuid,nodev,inode64 0 0
devpts /dev/pts devpts rw,seclabel,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,seclabel,nosuid,nodev,size=706108k,nr_inodes=819200,mode=755,inode64 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,seclabel,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,seclabel,nosuid,nodev,noexec,relatime 0 0
bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
/dev/mapper/ol_linuxhelp-root / xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,nosuid,noexec,relatime 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12869 0 0
mqueue /dev/mqueue mqueue rw,seclabel,nosuid,nodev,noexec,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,seclabel,relatime,pagesize=2M 0 0
debugfs /sys/kernel/debug debugfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/tracing tracefs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
vmware-vmblock /run/vmblock-fuse fuse.vmware-vmblock rw,relatime,user_id=0,group_id=0,default_permissions,allow_other 0 0
none /run/credentials/systemd-sysctl.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
none /run/credentials/systemd-sysusers.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
none /run/credentials/systemd-tmpfiles-setup-dev.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
/dev/nvme0n1p1 /boot xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
none /run/credentials/systemd-tmpfiles-setup.service ramfs ro,seclabel,nosuid,nodev,noexec,relatime,mode=700 0 0
tmpfs /run/user/1000 tmpfs rw,seclabel,nosuid,nodev,relatime,size=353052k,nr_inodes=88263,mode=700,uid=1000,gid=1000,inode64 0 0
gvfsd-fuse /run/user/0/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=0,group_id=0 0 0
/dev/mapper/ol_linuxhelp-root /mnt/test2 xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0none /sys/kernel/tracing tracefs rw,seclabel,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
/dev/mapper/rl-root / xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,seclabel,relatime 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=41,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=23113 0 0
mqueue /dev/mqueue mqueue rw,seclabel,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,seclabel,relatime,pagesize=2M 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
vmware-vmblock /run/vmblock-fuse fuse.vmware-vmblock rw,relatime,user_id=0,group_id=0,default_permissions,allow_other 0 0
/dev/sda1 /boot xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
tmpfs /run/user/0 tmpfs rw,seclabel,nosuid,nodev,relatime,size=282472k,mode=700 0 0
gvfsd-fuse /run/user/0/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=0,group_id=0 0 0

Conclusion:

We have reached the end of this article. In this guide, we have walked you through the steps required to create a bind-mount on Oracle Linux 9.3. Your feedback is much welcome.