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mount.nfs: access denied by server while mounting 一个解决办法

mount.nfs: access denied by server while mounting
这两天在搭建嵌入式开发环境,配置好NFS服务器后,遇到了一个很纠结的错误
使用 mount -t nfs 127.0.0.1:/home/lzgonline/rootfs /mnt 和 mount -t nfs 192.168.1.9:/home/lzgonline/rootfs /mnt 本机挂载nfs则没有问题,然而使用 mount -t nfs 192.168.3.12:/home/lzgonline/rootfs /mnt 时却出现了问题,导致开发板无法通过nfs挂载启动,其中192.128.3.12 和 192.128.1.9(即nfs服务器)之间建立了映射(DMZ)关系。
mount.nfs: access denied by server while mounting 192.168.3.12:/home/lzgonline/rootfs
百度、谷歌了很久,大部分都说是权限设置有问题,其实文件夹权限都设为777了,权限上都没问题,hosts.deny和hosts.allow都保留默认设置,防火墙也关了,该设置的都设置了,但还是被拒绝,很是郁闷,就在一筹莫展的时候,通过查看一些linux技术论坛后逐渐找到了问题所在。
首先使用命令查看出错日志文件
[root@lzgonline init.d]# 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
 
从出错日志可以看出,mount.nfs: access denied by server while mounting 192.168.3.12:/home/lzgonline/rootfs 被拒绝的原因是因为使用了非法端口,功夫总没白费,终于在一个linux技术论坛上找到了答案:

I googled and found that since the port is over 1024 I needed to add the "insecure" option to the relevant line in /etc/exports on the server. Once I did that (and ran exportfs -r), the mount -a on the client worked.

//如果端口号大于1024,则需要将 insecure 选项加入到配置文件(/etc/exports)相关选项中mount客户端才能正常工作:

查看 exports 手册中关于 secure 选项说明也发现确实如此

[root@lzgonline init.d]# man exports

secure,This  option requires that requests originate on an Internet port less than IPPORT_RESERVED (1024). This option is on by default. To turn it off, specify insecure.

//secure 选项要求mount客户端请求源端口小于1024(然而在使用 NAT 网络地址转换时端口一般总是大于1024的),默认情况下是开启这个选项的,如果要禁止这个选项,则使用 insecure 标识

修改配置文件/etc/exports,加入 insecure 选项

/home/lzgonline/rootfs  *(insecure,rw,async,no_root_squash)

保存退出

然后重启nfs服务:service nfs restart

然后问题就解决了

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