【转载】4412开发板关于挂载nfs出现的access denied ...的问题
(新手上路，不足务喷!谢谢)本文转自迅为讨论群:挂载出现问题如下（192.168.40.6（localhost）为我ubuntu主机地址）： 问题提示：mount.nfs: access denied by server while mounting localhost:/xxx/xxx/xxx（nfs共享目录，下面以/home/nfsrootfs举例）由服务器同时安装本地主机访问被拒绝（google翻译）可能的原因：①原因一：权限问题：可能是对/home/nfsrootfs的访问权限不够。解决办法：chmod 777 /home/nfsrootf.②原因二：使用了非法端口：该问题描述可以进入vi /var/log/syslog文件查看，按下Shift+G可以跳到末页，便于查看。你会看到如下信息(以下不是我的出错日志，我的那个找不到了，不过问题是一样的) # vi /var/log/syslogJun 29 00:49:04 lzgonline mountd: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1689Jun 29 00:51:02 lzgonline mountd: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1710Jun 29 01:02:17 lzgonline mountd: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 1916Jun 29 01:09:51 lzgonline mountd: refused mount request from 192.168.3.12 for /home/lzgonline/rootfs (/home/lzgonline/rootfs): illegal port 2157Jun 29 01:17:02 lzgonline mountd: 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。进一步说明：//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:原因二解决办法：修改配置文件/etc/exports，加入 insecure 选项 /home/nfsrootfs*(insecure,rw,async,no_root_squash) 保存退出 然后重启nfs服务：service nfs restart我的是：#/etc/init.d/nfs-kernel-server restart(关于这一点你可以去/etc/init.d目录下看自己的可执行文件名是nfs还是nfs-kernel-server。③原因三：没有配置hosts.deny和hosts.allow：描述：当你发现前俩个都没解决你的问题时，你就要考虑是不是原因三了，原因三系统日志描述或许如下：refused mount request from 192.168.40.6 for /home/taoshengyijiu/Desktop/NFS/system (/): no export entryexportfs –r会出现exportfs: Failed to stat /home*(rw,sync,no_root_squash): No such file or director或者挂载时出现超时。打开这俩个配置文件添加如下代码：vi hosts.allow添加（192.168.40.）是你的主机IP，可以通过ifconfig查看portmap:192.168.40.lockd:192.168.40.rquotad:192.168.40.mountd:192.168.40.statd:192.168.40.vi hosts.allow添加（192.168.40.）是你的主机IP，可以通过ifconfig查看rtmap:ALLlockd:ALLmountd:ALLrquotad:ALLstatd:ALL保存退出，关于各个单词的专业详解，各位自己百度，不想琐碎地百度粘贴了。 $ sudo /etc/init.d/portmap restart 重启portmap daemon.显示如下Since the script you are attempting to invoke has been converted to anUpstart job, you may also use the restart(8) utility, e.g. restart portmapportmap start/running, process XXXX sudo exportfs -r 更新 $ sudo showmount 192.168.40.6 –e显示Export list for 192.168.40.6:/home/nfsrootfs * $ sudo /etc/init.d/nfs-kernel-server restart 重启nfs服务显示如下*Stopping NFS kernel daemon * Unexporting directories for NFS kernel daemon... * Exporting directories for NFS kernel daemon... exportfs: /etc/exports : Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/home/work". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x * Starting NFS kernel daemon 挂载mount -t nfs 192.168.40.6:/home/nfsrootfs /mnt 其他情况请结合系统日志文件百度搜索，搜索过程因为是一个学习的过程。路漫漫其修远兮，吾将上下而求索
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