NFS export

Mount it to freshly created directory. Add to fstab for automatic mount during boot process.

Preparations:

sudo su
dnf install \
    nfs-utils

Configure

vi /etc/idmapd.conf

[General]
Verbosity = 0
Domain = (domain)

systemctl restart rpcbind

Allow network connectivity:

For Redhat family:

firewall-cmd --list-all
firewall-cmd --permanent --add-service=nfs
success
firewall-cmd --permanent --add-service=rpc-bind
success
firewall-cmd --permanent --add-service=mountd
success
firewall-cmd --permanent --reload
firewall-cmd --list-all

For Debian family:

ufw status
ufw allow nfs
ufw allow rpcbind
ufw allow mountd
ufw enable

hostname -s
export host="$(hostname -s)"

Decide which declaration will be used: FQDN or IP address (depending on purpose).

export src_host="(source host)"
ping ${src_host}
showmount -e ${src_host}

Verify that needed export is listed in the output and set a variable:

export src_export="(name of exported directory)"

Create local directory where a NFS export will be mounted. Naming used here comes from the name of attached disk to the VM (usually). To clarify, that it is a data disk, -data suffix is added.

export dir="/mnt/${host}-data/"
mkdir -p ${dir}

Before mounting the export, check where target directory is mounted, it should be mounted on the root / and it should be empty.

df -h ${dir}
ls -la ${dir}

Finally, check variables and mount the export.

echo ${src_host}
echo ${src_export}
echo ${dir}
mount ${src_host}:${src_export} ${dir}
mount | grep ${src_host}

Check again

df -h ${dir}
ls -la ${dir}

Mounting source should be presented as IP address and exported path and it should be mounted in the correct destination. For example:

[root@host mnt]# df -h ${dir}
Filesystem                     Size  Used Avail Use% Mounted on
10.xxx.x.xx:/aaa/data/bbb/ccc  1.0T     0  1.0T   0% /mnt/host-data

#TODO: add into /fstab with oneliner
```bash
cat /etc/fstab

cat <<EOF >> /etc/fstab
${src_host}:${src_export} ${dir} nfs defaults 0 0
EOF

cat /etc/fstab
systemctl daemon-reload

Umount and check automatic mounts, simulating restart.

mount | grep ${src_host}
umount ${dir}
mount | grep ${src_host}

mount -aF
mount | grep ${src_host}
df -h ${dir}

Try to write to the destination

touch ${dir}/test.md

Let's create an application directory. In my case, I use /data/ncp/ as structure for an application "NextCloud Production". Be consistent in directory structure: /data/ - for data, /home/ for users' home directories and similar across the infrastructure.

mkdir -p ${dir}/data/ncp/
df -h ${dir}/data/ncp/

when possible, test VM restart to ensure disk will be properly mounted

shutdown -r now