普通用户无法访问NFS4挂载（权限被拒绝）

我有nfsserver和nfsclient机器。

在nfsserver上：

# cat /etc/exports /export gss/krb5p(rw,sync,fsid=0,no_subtree_check,crossmnt) /export/home gss/krb5p(rw,sync,no_subtree_check) 

在nfsclient上挂载OK：

 # mount -vvv -t nfs4 -o sec=krb5p nfsserver:/home /homex mount: fstab path: "/etc/fstab" mount: mtab path: "/etc/mtab" mount: lock path: "/etc/mtab~" mount: temp path: "/etc/mtab.tmp" mount: UID: 0 mount: eUID: 0 mount: spec: "nfsserver:/home" mount: node: "/homex" mount: types: "nfs4" mount: opts: "sec=krb5p" mount: external mount: argv[0] = "/sbin/mount.nfs4" mount: external mount: argv[1] = "nfsserver:/home" mount: external mount: argv[2] = "/homex" mount: external mount: argv[3] = "-v" mount: external mount: argv[4] = "-o" mount: external mount: argv[5] = "rw,sec=krb5p" mount.nfs4: timeout set for Tue Apr 30 13:03:13 2013 mount.nfs4: trying text-based options 'sec=krb5p,addr=10.10.10.100,clientaddr=10.10.10.101' nfsserver:/home on /homex type nfs4 (rw,sec=krb5p) 

但是我只能以root身份访问这个目录。 普通用户得到：

• 文件写入错误，同时通过FileZilla上传
• 如何列出与用户或安全组关联的所有NTFS和共享权限？
• PHPfile upload系统安全隐患
• Win2k3文件服务器上的组权限（貌似）被忽略
• 无法以root身份删除目录

 $ ls /homex ls: cannot access /homex: Permission denied $ df /homex df: `/homex': Permission denied df: no file systems processed 

我用rpcdebug打开了所有的NFSdebugging（nfsserver，nfsclient），但在正常用户尝试访问挂载的目录期间，我在nfsclient上看到的唯一一件事是：

 Apr 30 12:51:19 nfsclient kernel: [ 5896.339330] NFS: permission(0:13/917551), mask=0x24, res=-13 Apr 30 12:51:32 nfsclient kernel: [ 5909.182185] NFS: revalidating (0:13/917551) Apr 30 12:51:32 nfsclient kernel: [ 5909.189372] nfs_revalidate_inode: (0:13/917551) getattr failed, error=-13 

在nfsserver上没有任何东西（甚至在用tcpdump嗅探时没有networkingstream量）。

文件权限似乎是确定的：

 # ls -ld /homex drwxr-xr-x 3 root root 4096 Apr 5 18:15 /homex # ls -l /homex total 4 drwxr-xr-x 6 mike mike 4096 Apr 29 13:48 mike # df /homex Filesystem 1K-blocks Used Available Use% Mounted on nfsserver:/home 20640384 1390208 18201600 8% /homex 

用户麦克在两台机器上都有相同的UID。