Setup an NFSv4 Server

Table of Contents

Installation #

I’m using Rocky Linux:

dnf install nfs-utils -y

Disable NFS Versions 2/3 and RPC Services #

Inside etc/nfs.conf, look for[nfsd] and comment/uncomment the following lines:

 vers2=n
 vers3=n
 vers4=y
 vers4.0=y
 vers4.1=y
 vers4.2=y

Disable RPC Services:

[root@rockylinux ~]# systemctl mask --now rpc-statd.service rpcbind.service rpcbind.socket
Created symlink /etc/systemd/system/rpc-statd.service → /dev/null.
Created symlink /etc/systemd/system/rpcbind.service → /dev/null.
Created symlink /etc/systemd/system/rpcbind.socket → /dev/null.

Start and Enable NFS #

systemctl enable --now nfs-server

Setup NFS Directory #

$ mkdir /srv/nfsdata

$ chown -R nobody:nobody /srv/nfsdata

$ echo "test -> nfs" > /srv/nfsdata/test.txt

Define NFS Shares #

With read-write enabled:

[root@rockylinux srv]# cat /etc/exports
/srv/nfsdata 192.168.100.0/24(rw)

Show exports #

All the options except rw are enabled by default:

[root@rockylinux ~]# exportfs -v
/srv/nfsdata  	192.168.100.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,root_squash,no_all_squash)

Open ports #

Only rpc.mountd and nfs are required to be running for Version 4. NFSv4 runs on TCP port 2049:

[root@rockylinux ~]# firewall-cmd --add-service={nfs,mountd} --permanent
success
[root@rockylinux ~]# firewall-cmd --reload
success

Mount on Client #

On Linux:

root@debianlab:~# mount.nfs -o vers=4 192.168.100.132:/srv/nfsdata /mnt/nfstest/
root@debianlab:~#
root@debianlab:~#
root@debianlab:~# ls /mnt/nfstest/
test.txt
root@debianlab:~# cat /mnt/nfstest/test.txt
nfs is working

On macOS:

sudo mount_nfs -o resvport -o vers=4 192.168.100.132:/srv/nfsdata Downloads/nfstest

Configure Automount in fstab #

Creating an entry in /etc/fstab:

192.168.100.132:/srv/nfsdata /mnt/nfstest           nfs     rw,soft         0 0

Note: You can’t mount an NFS share as read-write if it was defined as read-only on the NFS server. If you are unable to mount it, do verify your mount options.

Show NFS Mount on client #

The commands listed will only show NFS shares mounted on your system:

$ mount | grep nfs
$ nfsstats --mounts
$ cat /proc/mounts | grep nfs

With NFSv4 you’ll not be able to view an NFS server’s shares(rpcbind is required).

Run umount [host]:[nfs_share] and modify /etc/fstab:

umount 192.168.100.132:/srv/nfsdata