Your syntax is basically correct, as far as I can tell. Here's the results of a test on my own system, running Ubuntu 16.04 x86_64:
Code:
$ pwd
/home/unixforum/271681
$ ls
path1 path2
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
$ sudo /bin/mount --bind /home/unixforum/271681/path1 /home/unixforum/271681/path2
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ mount | grep unixforum
/dev/sda2 on /home/unixforum/271681/path2 type ext4 (rw,relatime,errors=remount-ro,data=ordered)
$ sudo /bin/umount /home/unixforum/271681/path2
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
$
Asf for the fstab entry, the syntax seems fine here too. Again, a test, this time doing the mounting with an fstab entry.
Code:
$ tail -1 /etc/fstab
/home/unixforum/271681/path1 /home/unixforum/271681/path2 bind bind 0 0
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
$ sudo /bin/mount /home/unixforum/271681/path2
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ sudo /bin/umount /home/unixforum/271681/path2
$ ls path1
doc1.pdf file1.txt image1.jpeg sheet1.xlsx
$ ls path2
$
So I'm not sure why this isn't working on your own system. Certiainly on my own local box, this syntax works fine, and I didn't really have to change anything you were doing.
Just to check something: the order in a bind mount is source first, then destination. So in my above examples, it was the content of path1 that I wanted to show up under path2. Is it the case that you want all the content currently in /prod/OpenCSS to show up underneath /var/lib/test and/or /var/lib/pgsql, or it is the PostgreSQL content you want to appear underneath the other directory ?
Also, if you look at the content of both directories before doing the bind mount, are either of them empty to begin with ?
Great, glad you got that sorted. One last thing that may disappoint, however. If you're doing this because you're hoping to basically add the free space of the /prod/OpenCSS filesystem to the existing /var/lib/pgsql filesystem...well, then you're out of luck.
That's not how bind mounts work, or what they're for. They're purely for providing an alternative path to access the same content in multiple places, and nothing else. The free space you'll see will be that of the original filesystem, since all the calls are being routed through to the original filesystem - the new one (in your scenario) isn't actually going to be used at all.
For example, watch what happens if I do a bind mount of my /boot filesystem to a new directory, /mnt/misc:
Code:
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 225G 132G 82G 62% /
$ sudo /bin/mount --bind /boot /mnt/misc
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /mnt/misc
$ sudo /bin/umount /mnt/misc
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 225G 132G 82G 62% /
$
So as you can see, the disc space and all other properties of the bind mount destination are the same as the source, since in reality all you're doing is providing an additional path for accessing the source, and nothing more.
I did moved data to new point and then implemented bind mount to make use of the space ...
---------- Post updated at 04:58 PM ---------- Previous update was at 04:57 PM ----------
Quote:
Originally Posted by drysdalk
Hi,
Great, glad you got that sorted. One last thing that may disappoint, however. If you're doing this because you're hoping to basically add the free space of the /prod/OpenCSS filesystem to the existing /var/lib/pgsql filesystem...well, then you're out of luck.
That's not how bind mounts work, or what they're for. They're purely for providing an alternative path to access the same content in multiple places, and nothing else. The free space you'll see will be that of the original filesystem, since all the calls are being routed through to the original filesystem - the new one (in your scenario) isn't actually going to be used at all.
For example, watch what happens if I do a bind mount of my /boot filesystem to a new directory, /mnt/misc:
Code:
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 225G 132G 82G 62% /
$ sudo /bin/mount --bind /boot /mnt/misc
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /mnt/misc
$ sudo /bin/umount /mnt/misc
$ df -h /boot
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 240M 110M 114M 49% /boot
$ df -h /mnt/misc
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 225G 132G 82G 62% /
$
So as you can see, the disc space and all other properties of the bind mount destination are the same as the source, since in reality all you're doing is providing an additional path for accessing the source, and nothing more.
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