Consider i have files in /mnt i am mounting an nfs share to /mnt. After that i can find the nfs share contents in /mnt. But the preexisted files are missing. Is there any way to access both the preexisting and mounted files simultaneously?
Strictly speaking: No you cannot see Filesystem contents for lower mounted filesystems.
Nevertheless there are some solutions to the problems. The few that spring to mind being:
- unionfs - takes few FS and presents a merged view of them
- aufs - same thing as unionfs but more mature
Best practice is NOT to mount multiple filesystems on one mountpoint. If it is required to be accessible under a single tree either make directories inside the mountpoint and mount it there or mount them one under the other e.g. /mnt/nfs/< nfs share files >
I don't think you can. (see EDIT) The easiest way to do this is to create a subdirectory in /mnt and then mount the nfs share in the subdirectory. If, for example, you have the file1.txt and file2.txt in /mnt and you have file3.txt and file4.txt in the nfs share.
# mkdir /mnt/nfs # mount <nfs-share> /mnt/nfs
# ls /mnt file1.txt file2.txt nfs # ls /mnt/nfs file3.txt file4.txt
EDIT: This was the closest thing I could find
The general idea is to bind mount the parent directory of /mnt (i.e. /) so that the actual contents of /mnt can be accessed.
# mkdir /fakeroot # mount --bind / /fakeroot # mount <nfs-share> /mnt
# ls /mnt file3.txt file4.txt # ls /fakeroot/mnt file1.txt file2.txt
If you want to see both the files in /mnt and the files in the nfs share in /mnt you will probably need a union filesystem.