3.配置防火墙，开启服务：

[root@localhost ~]# firewall-cmd --permanent --add-service=nfs
success
[root@localhost ~]# firewall-cmd --permanent --add-service=mo
untd
success
[root@localhost ~]# firewall-cmd --permanent --add-service=rpc-bind
success
[root@localhost ~]# firewll-cmd --reload
[root@localhost ~]# firewall-cmd --list-all
public (active)target: defaulticmp-block-inversion: nointerfaces: ens160sources: services: cockpit dhcpv6-client dns http mountd nfs rpc-bind sshports: protocols: forward: yesmasquerade: noforward-ports: source-ports: icmp-blocks: rich rules: 
[root@localhost ~]# vim /etc/exports
[root@localhost ~]# cat /etc/exports
/data 192.168.244.137(rw)
[root@localhost ~]# systemctl restart nfs-server
[root@localhost ~]# showmount -e 192.168.244.130
Export list for 192.168.244.130:
[root@localhost ~]# vim /etc/exports
[root@localhost ~]# chmod 777 /data
[root@localhost ~]# systemctl restart nfs-server
[root@localhost ~]# showmount -e 192.168.244.130
Export list for 192.168.244.130:
/data *

从服务器：（访问主服务器的内容并且建立自动挂载）

[root@openEuler ~]# showmount -e 192.168.244.130
Export list for 192.168.244.130:
/data *
[root@openEuler ~]# mkdir /nfsclient/client-data/ -p
[root@openEuler ~]# mount 192.168.244.130:/data /nfsclient/client-data/
[root@openEuler ~]# df -h /nfsclient/client-data/
Filesystem             Size  Used Avail Use% Mounted on
192.168.244.130:/data   70G  6.9G   64G  10% /nfsclient/client-data
[root@openEuler ~]# cd /nfsclient/client-data/
[root@openEuler client-data]# ll
total 0
-rw-r--r--. 1 root root 0 Jul 10  2024 testfile
[root@openEuler client-data]# touch caicaikan
[root@openEuler client-data]# ll
total 0
-rw-r--r--. 1 nobody nobody 0 Jul 10  2024 caicaikan
-rw-r--r--. 1 root   root   0 Jul 10  2024 testfile
[root@openEuler client-data]# vim /etc/fstab#重启
[root@openEuler ~]# df -h /nfsclient/client-data/
Filesystem             Size  Used Avail Use% Mounted on
192.168.244.130:/data   70G  6.9G   64G  10% /nfsclient/client-data