Ygtjki

I have three machines in production -

machineA 10.66.136.129
machineB 10.66.138.181
machineC 10.66.138.183

and all those machines have Ubuntu 12.04 installed in it and I have root access to all those three machines.

Now I am supposed to do below things in my above machines -

Create mount point /opt/exhibitor/conf
Mount the directory in all servers.
 sudo mount <NFS-SERVER>:/opt/exhibitor/conf /opt/exhibitor/conf/

I have already created /opt/exhibitor/conf directory in all those three machines as mentioned above.

Now I am trying to create a Mount Point. So I followed the below process -

Install NFS support files and NFS kernel server in all the above three machines

$ sudo apt-get install nfs-common nfs-kernel-server

Create the shared directory in all the above three machines

$ mkdir /opt/exhibitor/conf/

Edited the /etc/exports and added the entry like this in all the above three machines -

# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
#
/opt/exhibitor/conf/ 10.66.136.129(rw)
/opt/exhibitor/conf/ 10.66.138.181(rw)
/opt/exhibitor/conf/ 10.66.138.183(rw)

I have tried mounting on machineA like below from machineB and machineC and it gives me this error-

root@machineB:/# sudo mount -t nfs 10.66.136.129:/opt/exhibitor/conf /opt/exhibitor/conf/
mount.nfs: access denied by server while mounting 10.66.136.129:/opt/exhibitor/conf

root@machineC:/# sudo mount -t nfs 10.66.136.129:/opt/exhibitor/conf /opt/exhibitor/conf/
mount.nfs: access denied by server while mounting 10.66.136.129:/opt/exhibitor/conf

Did my /etc/exports file looks good? I am pretty sure, I have messed up my exports file. As I have the same content in all the three machines in exports file.

Any idea what wrong I am doing here? And what will be the correct /exports file here?

exportfs

When you create a /etc/exports file on a server you need to make sure that you export it. Typically you'll want to run this command:

$ exportfs -a

This will export all the entries in the exports file.

showmount

The other thing I'll often do is from other machines I'll check any machine that's exporting NFS shares to the network using the showmount command.

$ showmount -e <NFS server name>

Example

Say for example I'm logged into scully.

$ showmount -e mulder
Export list for mulder:
/export/raid1/isos 192.168.1.0/24
/export/raid1/proj 192.168.1.0/24
/export/raid1/data 192.168.1.0/24
/export/raid1/home 192.168.1.0/24
/export/raid1/packages 192.168.1.0/24

fstab

To mount these upon boots you'd add this line to your client machines that want to consume the NFS mounts.

server:/shared/dir /opt/mounted/dir nfs rsize=8192,wsize=8192,timeo=14,intr

automounting

If you're going to be rebooting these servers then I highly suggest you look into setting up automounting (autofs) instead of adding these entries to /etc/fstab. It's a bit more work but is well worth the effort.

Doing so will allow you to reboot the servers more independently from one another and also will only create the NFS mount when it's actually needed and/or being used. When it goes idle it will get unmounted.

References

• 18.2. NFS Client Configuration - CentOS 5 Deployment Guide

I saw the same error (mount.nfs: access denied by server while mounting...) and the issue was fixed by -o v3 option as follows:

$ sudo mount -o v3 a-nfs-server:/path/to/export /path/to/mount

• Server is Ubuntu 14.04 64bit LTS.


• Client is CentOS 6.5 64bit.

In my case works using nfs4 doing:

$ sudo mount -t nfs4 server-name:/ /path/to/mount

In the /etc/export file on server

/Path/to/export 192.168.1.0/24(rw,sync,fsid=0,no_root_squash,crossmnt,no_subtree_check,no_acl)

fsid=0 makes the /Path/to/export the root directory when you mount the share.

crossmnt, because I have some others drives in the exported file system that I want to access also.

no_root_squash, because I want to access as root user (su) from the client side. I'm pretty sure that I'm the only one that can do that in my local network.

Server and clients are Ubuntu 14.04 64bit.

If you want to use nfs3, the answer of @fumisky-wells works for me as well.

I was getting the same error message and my issue turned out to be due to the client machine having two network interfaces connected to the same LAN. The server had been configured to expect a specific IP address and traffic was going out on the second interface that has a dhcp IP address. So I just configured the second interface to have a static IP address and also added the second static IP address to the server configuration.