NFS Server Configuration RHEL 7 / Cent OS 7

#yum install nfs*

Check whether the packages are installed by executing below command

[root@server ~]# rpm -qa | grep nfs
libnfsidmap-0.25-15.el7.x86_64
nfsometer-1.7-1.el7.noarch
nfs4-acl-tools-0.3.3-15.el7.x86_64
nfs-utils-1.3.0-0.33.el7.x86_64
nfstest-2.1.1-0.0.el7.noarch

Important configuration files:

/etc/exports :                This file contains which all are exported to remote                                                                 machines 
/etc/host.allow :           Daemon/ Client which matches the entry available in                                                        this file, will be granted access.
/etc/host.deny :           Access is denied for daemon/ client which matches in                                                     this file.
/etc/fstab :                      Will mount the shared directories/ filesystems                                                                   permanently using this file.
/etc/sysconfig/nfs:  Will manage the nfs port using this file.

Services which need to be enabled and started:

rpcbind  service
nfs-server  service

Command to enable the services:

#systemctl enable rpcbind
#systemctl enable nfs-server

[root@server ~]# systemctl enable rpcbind
[root@server ~]# systemctl enable nfs-server
Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.

Command to start the services:

#systemctl start rpcbind
#systemctl start nfs-server

[root@server ~]# systemctl start nfs-server

[root@server ~]# systemctl start rpcbind

create directory for sharing:

[root@server ~]# mkdir /nfshare

set the all permission to all

#chmod 777 /nfshare

Now share the directory using NFS by mentioning the directory details in /etc/exports file

#vi /etc/exports

/nfsfileshare 192.168.12.7(rw,sync,no_root_squash)

save and exit from the file

Now use the below command to make it available in network as a shared directory

[root@server ~]# exportfs -r

Enable the services permanently in firewall in this session

[root@server ~]# firewall-cmd --permanent --zone public --add-service  mountd
success
[root@server ~]# firewall-cmd --permanent --zone public --add-service rpc-bind
success
[root@server ~]# firewall-cmd --permanent --zone public --add-service nfs
success

reload the firewall  changes and make effect in this session by executing below command

[root@server ~]# firewall-cmd --reload
success

Now all the configuration has been done in server side and have to check and mount the shared directory in client machine.

showmount command will help us to list the directory which is shared from remote machine.

[root@node1 ~]# showmount -e 192.168.43.226
Export list for 192.168.43.226:
/nfshare *

Now we need to mount the shared directory in client. Before that we should create a directory to use that as a mount point.

[root@node1 ~]# mkdir /nfsmount

Mount the directory temporarily

#mount 192.168.43.226:/nfshare  /nfsmount

Mount permanently by editing /etc/fstab file and make entry

#vi /etc/fstab
192.168.43.226:/nfshare/ /nfsmount nfs rw,sync 0 0

save and exit from the file.

unmount the directory because we mounted temporarily before restart and after restart issue mount to check whether the shared directory is listing or not. If its not listing then there is an issue with entry in /etc/fstab file.

#umount /nfsmount

Restart the client and check using mount command

[root@node1 ~]# mount | grep /nfsmount
192.168.43.226:/nfshare/ on /nfsmount type nfs (rw,sync,vers=4,addr=192.168.43.226,clientaddr=192.168.43.67)