How to mount multiple folders with nfs4 on centos?

linux centos nfs nfs4

18,605

Solution 1

In order to share the subdirectories, I had to share the parent folder first with fsid=0. So on the server /etc/exports looks like this:

/var/shared 192.168.200.101(rw,fsid=0,sync)
/var/shared/folder1 192.168.200.101(rw,sync)
/var/shared/folder2 192.168.200.101(rw,sync)

then on the client /etc/fstab looks like:

192.168.200.201:/folder1 /home/nfsmnt/folder1 nfs4 rw 0 0
192.168.200.201:/folder2 /home/nfsmnt/folder2 nfs4 rw 0 0

I can then mount the folders as expected:

mount /home/nfsmnt/folder1

Solution 2

The problem is that you have fsid=0 for two exported filesystems. That is the error message you're getting. fsid=0 is used to set the top of the exported filesystem tree in nfsv4. Set that only once. Typically you'd have something like this i /etc/exports on the server:

/var/shared         192.168.200.101(rw,fsid=0,sync)
/var/shared/folder1 192.168.200.101(rw,sync)
/var/shared/folder2 192.168.200.101(rw,sync)

See http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-nfs-server-config-exports.html

Solution 3

in /etc/fstab, either of the 2 syntaxes should do

192.168.200.201:/var/shared/folder1 /home/nfsmnt/folder1 nfs4 rw,defaults 0 0 192.168.200.201:/var/shared/folder1 /home/nfsmnt/folder1 nfs rw,nfsvers=4,defaults 0 0

18,605

stormdrain

Updated on September 17, 2022

Comments

stormdrain almost 2 years
I'm trying to get nfs4 working here.

Machine 1 (server) I have a folder and in it 2 other folders I'm trying to share independently. /shared/folder1 /shared/folder2

Problem is, I can't seem to figure out how to mount the folders independently on the client.

(Machine 1 - server) /etc/exports:
```
/var/shared/folder1 192.168.200.101(rw,fsid=0,sync)
/var/shared/folder2 192.168.200.101(rw,fsid=0,sync)
```
...
```
exportfs -ra
```
...
```
exportfs

/var/shared/folder1
                   192.168.200.101
/var/shared/folder2
                   192.168.200.101
```
(Machine 2 - client) /etc/fstab:
```
192.168.200.201:/folder1/ /home/nfsmnt/folder1 nfs4 rw 0 0
```
...
```
mount /home/nfsmnt/folder1
mount.nfs4: 192.168.200.201:/folder1/ failed, reason given by server: No such file or directory
```
The folder is there. I'm positive. I think there is something simple I'm missing, but I'm totally missing it.

It seems like there should be a way in fstab to tell nfs which folder on the server I want to mount. But I can only find references to what looks like a root mount point (e.g. 192.168.1.1:/) which I assume is handled by exports on the server. But even with the folders set up in exports, there doesn't seem to be an apparent way to pich and choose which gets mounted.

Is it not possible to mount separate folders from the same server to different mount points on the client?

Any help appreciated.

edit:

The error log on the server is showing the following:
```
/var/shared/folder1 and /var/shared/folder2 have same filehandle for 192.168.200.101, using first
```
Not sure what that means or how to change it. Googling only seems ti bring up info about nfs security.
stormdrain about 14 years

I still get a folder not found error.mount.nfs4: 192.168.200.201:/var/shared/folder1 failed, reason given by server: No such file or directory Also get: 'vers=4' is not supported. Use '-t nfs4' instead. Thanks!
Jmarki about 14 years

apologies, mixed up with the Solaris command. vers=4 should be nfsvers=4.
Jmarki about 14 years

I think you should not have fsid=0 in your /etc/exports lines. Both folders are forced to be the same export handler, causing the same filehandler error log. See man exports for details on fsid
stormdrain about 14 years

Nope. I tried both changing each line of exports to fsid=1, fsid=2 respectively and fsid=0, fsid=1 respectively and I get Operation not permitted errors.
DrSAR almost 12 years

You are giving rw access to your parent directory /var/shared. Is that what you want? I tried exporting it ro but then, bizarrely, the 2nd of the two subfolders becomes mounted ro despite the explicit rw flag
stormdrain almost 12 years

Yeah I created /var/shared specifically for the samba shares so rw is fine on that folder. Not sure what's going on with your sub-folder...is fstab rw?
Rooster over 10 years

@stormdrain do you even need to add both folders to the fstab? Couldn't you just do a 192.168.200.201:/ /home/nfsmnt/shared nfs4 rw 0 0 ?
stormdrain over 10 years

@Rooster to be honest, I'm not sure. I haven't played with it since I got it working (still works all these years later; me <3 linux). If I remember correctly, I think I did it this way because of samba and the way it uses share definitions.
Rooster over 10 years

@stormdrain ah I answered my own question. you can do it either way, but to do it on the machine I'm using I had to include nohide in the options. Ie. /var/shared/folder2 192.168.200.101(rw,sync,nohide)
stormdrain over 10 years

@Rooster nice, glad you got it working. And thanks for letting us know what worked for you.