Prerequisites

Please note that this configuration allows any host on the internal network to access NSF without authentication. The shared directory name follows Kubernetes conventions but can be customized as needed to suit deployment requirements. The local network is configured as 192.168.3.0/24. The system is located on a separate SSD. An additional HDD is mounted as a shared drive via NFS.

The network consists of the following hosts:

NFS server installation (host 192.168.3.24)

Checking the UUID assigned to our disk partition:

blkid

It is assumed that the disk has not been mounted previously.

Add the following line to the file /etc/fstab (Replace <UUID_OF_MOUNTED_PARTITION> with the value from blkid command):

UUID=<UUID_OF_MOUNTED_PARTITION>   /mnt/storage   ext4   defaults,noatime,nofail,commit=120,x-systemd.device-timeout=30   0   2

Some parameters can be adjusted as needed to suit specific requirements.\

Create the directory:

sudo mkdir -p /mnt/storage

Reboot:

sudo reboot now

After the restart, we verify whether the disk has been correctly mounted. If the disk is mounted, proceed to install the NFS server:

sudo apt update
sudo apt install -y nfs-kernel-server

Add the following line to the /etc/exports file:

/mnt/storage/k8s-shared   192.168.3.0/24(rw,sync,no_subtree_check,no_root_squash)

It is also possible to restrict access to selected IP addresses:

/mnt/storage/k8s-shared  192.168.3.22(rw,sync,no_subtree_check,no_root_squash) 192.168.3.23(rw,sync,no_subtree_check,no_root_squash) 192.168.3.24(rw,sync,no_subtree_check,no_root_squash)

Where:

• rw – read and write access
• sync – changes are written to disk before acknowledgment
• no_subtree_check – faster operation
• no_root_squash – the client’s root user retains root privileges on the server (crucial in Kubernetes!)

Save the file and apply the changes:

sudo exportfs -ra

Verify that the export is visible:

sudo exportfs -v

Restart the host and verify again if the directory is visible:

sudo reboot now

sudo exportfs -v

NFS client installation on all nodes (hosts: 192.168.3.22, 192.168.3.23, 192.168.3.24)

All operations are repeated on every host, including the NFS server.

Install on all nodes, including the NFS server:

sudo apt update
sudo apt install -y nfs-common

Create the directory and set permissions:

sudo mkdir -p /mnt/storage/k8s-shared
sudo chmod 777  /mnt/storage/k8s-shared
sudo chown nobody:nogroup /mnt/storage/k8s-shared

Add the following line to the file /etc/fstab (only client nodes, without 192.168.3.24):

192.168.3.24:/mnt/storage/k8s-shared   /mnt/nfs-k8s   nfs4   _netdev,noauto,x-systemd.automount,x-systemd.device-timeout=30,timeo=10,soft,retry=3  0  0

Reboot:

sudo reboot now

Any file created or copied into the /mnt/storage/k8s-shared directory will now be visible on all configured nodes.

Warning: The mount operation occurs during system startup. Therefore, the NFS server must always be started first.