Follow these two guides installed NFS server and client:

• https://www.howtoforge.com/nfs-server-and-client-on-centos-7
• https://www.howtoforge.com/tutorial/setting-up-an-nfs-server-and-client-on-centos-7/

Hosts:

• Server: 192.168.1.1
• Client: 192.168.1.2

Server

Config /etc/exports on server:

[root@server ~]# cat /etc/exports 
/var/nfsshare    *(rw,sync,no_root_squash,no_all_squash)
/home            *(rw,sync,no_root_squash,no_all_squash)
/var/nfs         *(rw,sync,no_root_squash,no_all_squash)

Run:

[root@server ~]# exportfs -a

Client

Then tried to mount server from client, got error:

[root@client ~]# mount -t nfs 192.168.1.1:/home /mnt/nfs/home/
mount.nfs: access denied by server while mounting 192.168.1.1:/home

However, I can see mount information from client:

[root@client ~]# showmount -e 192.168.1.1
Export list for 192.168.1.1:
/var/nfs      *
/home         *
/var/nfsshare *

What's wrong?