参考链接：

https://blog.csdn.net/lhfeng/article/details/7297963

nfs挂载后权限映射错误的解决办法

现象

在server端和client端都建立相同的用户和组,检查uid和gid全部相同.例如usera其uid=501,usera其gid=501.大部分客户端挂载后权限正确,但是个别客户端的用户权限却被映射成了nobody.

具体如下:

错误的权限

[root@centos6 f1]# ls -l test/

总用量 4

drwxr-xr-x. 2 nobody nobody 4096 2月 21 16:19 test

-rw-r–r–. 1 nobody nobody 0 2月 27 2012 test2

-rw-r–r–. 1 nobody nobody 0 2月 21 16:20 test.log

正确的权限

[root@centos6 f1]# ls -l test/

总用量 4

drwxr-xr-x. 2 usera usera 4096 2月 21 16:19 test

-rw-r–r–. 1 usera usera 0 2月 27 2012 test2

-rw-r–r–. 1 usera usera 0 2月 21 16:20 test.log

解决方法:

[root@centos6 etc]# vi /etc/idmapd.conf

[Mapping]

Nobody-User = usera

Nobody-Group = usera

[root@centos6 etc]# service rpcidmapd restart

正在启动 RPC idmapd：[确定]

正在启动 RPC idmapd：[确定]

问题解决.

原因:rpcidmap默认使用nsswitch进行用户和组的解析,而nis并没有配置,导致解析失败.用户和组被映射到nobody用户和组上.

日志记录如下:

[root@centos6 ~]# rpc.idmapd -vvvv -f

rpc.idmapd: libnfsidmap: using domain: li.rq

rpc.idmapd: libnfsidmap: Realms list: ‘LI.RQ’

rpc.idmapd: libnfsidmap: processing ‘Method’ list

rpc.idmapd: libnfsidmap: loaded plugin /usr/lib/libnfsidmap/nsswitch.so for method nsswitch

rpc.idmapd: Expiration time is 600 seconds.

rpc.idmapd: nfsdopenone: Opening /proc/net/rpc/nfs4.nametoid/channel failed: errno 2 (No such file or directory)

rpc.idmapd: New client: c

rpc.idmapd: Opened /var/lib/nfs/rpc_pipefs//nfs/clntc/idmap

rpc.idmapd: New client: d

rpc.idmapd: nfs4_name_to_uid: calling nsswitch->name_to_uid

rpc.idmapd: nss_getpwnam: name ‘root@localdomain’ domain ‘li.rq’: resulting localname ‘(null)’

rpc.idmapd: nss_getpwnam: name ‘root@localdomain’ does not map into domain ‘li.rq’

rpc.idmapd: nfs4_name_to_uid: nsswitch->name_to_uid returned -22

rpc.idmapd: nfs4_name_to_uid: final return value is -22

rpc.idmapd: Client c: (user) name “root@localdomain” -> id “99”

rpc.idmapd: New client: e

rpc.idmapd: nfscb: read(/var/lib/nfs/rpc_pipefs//nfs/clntc/idmap): No such file or directory

rpc.idmapd: nfs4_name_to_gid: calling nsswitch->name_to_gid

rpc.idmapd: nfs4_name_to_gid: nsswitch->name_to_gid returned -22

rpc.idmapd: nfs4_name_to_gid: final return value is -22

rpc.idmapd: Client c: (group) name “usera@localdomain” -> id “99”

rpc.idmapd: Stale client: d

rpc.idmapd: -> closed /var/lib/nfs/rpc_pipefs//nfs/clntd/idmap