As the first step, we will install these packages on the CentOS server with yum:
yum install nfs-utils
Now create the directory that will be shared by NFS:
Change the permissions of the folder as follows:
chmod -R 755 /var/nfsshare chown nfsnobody:nfsnobody /var/nfsshare
We use /var/nfsshare as shared folder, if we use another drive such as the /home directory, then the permission chnges will cause a massive permissions problem and ruin the whole hierarchy. So in case we want to share the /home directory then permissions must not be changed. Next, we need to start the services and enable them to be started at boot time.
systemctl enable rpcbind systemctl enable nfs-server systemctl enable nfs-lock systemctl enable nfs-idmap systemctl start rpcbind systemctl start nfs-server systemctl start nfs-lock systemctl start nfs-idmap
Now we will share the NFS directory over the network a follows:
We will make two sharing points /home and /var/nfsshare. Edit the exports file as follows:
/var/nfsshare 192.168.0.101(rw,sync,no_root_squash,no_all_squash) /home 192.168.0.101(rw,sync,no_root_squash,no_all_squash)
Note 192.168.0.101 is the IP of client machine, if you wish that any other client should access it you need to add the it IP wise other wise you can add “*” instead of IP for all IP access.
Condition is that it must be pingable at both ends. Finally, start the NFS service:
systemctl restart nfs-server
Again we need to add the NFS service override in CentOS 7 firewall-cmd public zone service as:
firewall-cmd --permanent --zone=public --add-service=nfs firewall-cmd --permanent --zone=public --add-service=mountd firewall-cmd --permanent --zone=public --add-service=rpc-bind firewall-cmd --reload
Note: If it will be not done, then it will give error for Connection Time Out at client side.
Now we are ready with the NFS server part.
NFS client end:
In my case, I have a CentOS 7 desktop as client. Other CentOS versions will also work the same way. Install the nfs-utild package as follows:
yum install nfs-utils
Now create the NFS directory mount points:
mkdir -p /mnt/nfs/home mkdir -p /mnt/nfs/var/nfsshare
Next, we will mount the NFS shared home directory in the client machine as shown below:
mount -t nfs 192.168.0.100:/home /mnt/nfs/home/
It will mount /home of NFS server. Next we will mount the /var/nfsshare directory:
mount -t nfs 192.168.0.100:/var/nfsshare /mnt/nfs/var/nfsshare/
Now we are connected with the NFS share, we will crosscheck it as follows:
df -kh [root@client1 ~]# df -kh Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 39G 1.1G 38G 3% / devtmpfs 488M 0 488M 0% /dev tmpfs 494M 0 494M 0% /dev/shm tmpfs 494M 6.7M 487M 2% /run tmpfs 494M 0 494M 0% /sys/fs/cgroup /dev/mapper/centos-home 19G 33M 19G 1% /home /dev/sda1 497M 126M 372M 26% /boot 192.168.0.100:/var/nfsshare 39G 980M 38G 3% /mnt/nfs/var/nfsshare 192.168.0.100:/home 19G 33M 19G 1% /mnt/nfs/home [root@client1 ~]#
So we are connected with the NFS share. Now we will check the read/write permissions in the shared path. At client enter the command:
So we successfully configured an NFS-share.
Permanent NFS mounting
We have to re-mount the NFS share at the client after every reboot. Here are the steps to mount it permanently by adding the NFS-share in /etc/fstab file of client machine:
Add the entries like this:
[...] 192.168.0.100:/home /mnt/nfs/home nfs defaults 0 0 192.168.0.100:/var/nfsshare /mnt/nfs/var/nfsshare nfs defaults 0 0
Note 192.168.0.100 is the server NFS-share IP address, it will vary in your case.
This will make the permanent mount of the NFS-share. Now you can reboot the machine and mount points will be permanent even after the reboot.