server(10.1.1.1):

yum install nfs-utils rpcbind

vi /etc/exports

/opt/test/ 10.1.1.2(ro,no_root_squash,no_all_squash,sync)

service rpcbind start

service nfs start

client(10.1.1.2):

yum install showmount -y

showmount -e 10.1.1.1

mount -t nfs 10.1.1.1:/opt/test /opt/test