文章借鉴：https://www.cnblogs.com/shangbolei/p/4372057.html

服务器信息：

• 服务器server：
  192.168.3.12
• 客户端client：
  192.168.3.13
• nfs描述：
  192.168.3.12 和 192.168.3.13 共享一个文件夹 /home/lzgonline/rootfs

检查nfs服务器配置：

1.权限

查看文件夹权限
$ ls -lrt
drwxr-xr-x 

如果权限不足，会报错： permission denied

解决办法： 在服务器server（192.168.3.12）修改权限

$ chmod -R 755 /home/lzgonline/rootfs

2.nfs配置

查看配置信息：
$ cat /etc/exports
/home/lzgonline/rootfs  192.168.3.12(insecure,rw,async,no_root_squash)

配置信息里只配置了一个ip，会导致报错：mount.nfs:access denied by server while mounting
解决办法： 将ip修改成 网段 ，这也是我遇到的问题

$ vi /etc/exports
/home/lzgonline/rootfs  192.168.3.0/16(rw,async,no_root_squash)
$ systemctl restart nfs

3.端口异常

如果查看报错日志：
$ cat /var/log/messages | grep mount

Jun 29 00:49:04 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1689
Jun 29 00:51:02 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1710
Jun 29 01:02:17 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1916
Jun 29 01:09:51 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 2157
Jun 29 01:17:02 lzgonline mountd[1644]: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 2318

解决办法：在配置文件中添加 insecure

$ vi /etc/exports
/home/lzgonline/rootfs  192.168.3.0/16(insecure,rw,async,no_root_squash)
$ systemctl restart nfs