server：
yum -y install nfs-utils
cat /etc/exports
/nfs 10.11.0.0/16(rw,sync,no_root_squash,no_subtree_check)
systemctl enable rpcbind
systemctl restart rpcbind
systemctl enable nfs
systemctl restart nfs
client：
yum -y install nfs-utils
mount -t nfs 10.11.30.120:/nfs /log
vi /etc/rc.local
mount -t nfs 10.11.30.120:/nfs /log
ubuntu1804 nfs server:
apt-get install nfs-kernel-server nfs-common
mkdir /naslocal
vim /etc/exports
/naslocal 10.0.0.0/8(rw,sync,no_root_squash,no_subtree_check)
systemctl enable rpcbind
systemctl restart rpcbind
systemctl enable nfs-server
systemctl restart nfs-server