Usuário / grupo inválido via NFSv4 mount: nobody user?

Question

Temos 3 servidores:

• Um servidor NFS: 1.2.3.4 (rhel 6.8)
• Um bom cliente NFS: SERVER5G (rhel6.8)
• Um mau cliente do NFS: SERVER6B (rhel6.3)

O problema com o SERVER6B (mau cliente nfs) é que ele mostra o usuário / grupo para a mesma montagem NFS como "nobody".

máquinas NFSv4, RHEL 6.

[root@SERVER5G ~]# ls -la /var/FOODump/
total 55205372
drwxrwxr-x  18 foouser     root            4096 Jul 11 17:40 .
drwxr-xr-x. 31 root     root            4096 Mar 18 12:51 ..
-rw-------   1 foouser     foouser         1117958 Mar 23 10:41 bar.7z
[root@SERVER5G ~]# 
[root@SERVER5G ~]# stat /var/FOODump/bar.7z
  File: '/var/FOODump/bar.7z'
  Size: 1117958     Blocks: 2192       IO Block: 1048576 regular file
Device: 16h/22d Inode: 16          Links: 1
Access: (0600/-rw-------)  Uid: ( 2826/    foouser)   Gid: ( 2826/    foouser)
Access: 2016-03-23 10:41:48.000000000 +0000
Modify: 2016-03-23 10:41:31.000000000 +0000
Change: 2016-03-23 10:41:31.000000000 +0000
[root@SERVER5G ~]# 
[root@SERVER5G ~]# id nobody
uid=99(nobody) gid=99(nobody) groups=99(nobody)
[root@SERVER5G ~]# 
[root@SERVER5G ~]# id foouser
uid=2826(foouser) gid=2826(foouser) groups=2826(foouser)
[root@SERVER5G ~]# 
[root@SERVER5G ~]# df -mP /var/FOODump/
Filesystem                 1048576-blocks   Used Available Capacity Mounted on
1.2.3.4:/var/FOODump         193524 129698     53996      71% /var/FOODump
[root@SERVER5G ~]# 
[root@SERVER5G ~]# mount | grep FOODump
1.2.3.4:/var/FOODump on /var/FOODump type nfs (rw,vers=4,addr=1.2.3.4,clientaddr=1.2.3.5)
[root@SERVER5G ~]# 

e o cliente ruim:

[root@SERVER6B ~]# ls -la /var/FOODump/
total 55205372
drwxrwxr-x  18 nobody nobody        4096 Jul 11 17:40 .
drwxr-xr-x. 31 root   root          4096 Jul  6 06:40 ..
-rw-------   1 nobody nobody     1117958 Mar 23 10:41 bar.7z
[root@SERVER6B ~]# 
[root@SERVER6B ~]# stat /var/FOODump/bar.7z
  File: '/var/FOODump/bar.7z'
  Size: 1117958     Blocks: 2192       IO Block: 1048576 regular file
Device: 18h/24d Inode: 16          Links: 1
Access: (0600/-rw-------)  Uid: (   99/  nobody)   Gid: (   99/  nobody)
Access: 2016-03-23 10:41:48.000000000 +0000
Modify: 2016-03-23 10:41:31.000000000 +0000
Change: 2016-03-23 10:41:31.000000000 +0000
[root@SERVER6B ~]# 
[root@SERVER6B ~]# id nobody
uid=99(nobody) gid=99(nobody) groups=99(nobody)
[root@SERVER6B ~]# 
[root@SERVER6B ~]# id foouser
uid=2826(foouser) gid=2826(foouser) groups=2826(foouser)
[root@SERVER6B ~]# 
[root@SERVER6B ~]# df -mP /var/FOODump/
Filesystem                 1048576-blocks   Used Available Capacity Mounted on
1.2.3.4:/var/FOODump         193524 129698     53996      71% /var/FOODump
[root@SERVER6B ~]# 
[root@SERVER6B ~]# mount | grep FOODump
1.2.3.4:/var/FOODump on /var/FOODump type nfs (rw,vers=4,addr=1.2.3.4,clientaddr=1.2.3.6)
[root@SERVER6B ~]# 

Nós já tentamos desmontar, rmmod todos os módulos do kernel NFS, montar o / var / FOODump no SERVER6B, mas não ajudou.

Se nós "su - foouser" no SERVER6B, podemos "tocar no testfile":

• no SERVER6B é mostrado como ninguém.
• no SERVER5G, ele é mostrado como um bússola

Pergunta : Por que o SERVER6B está mostrando o usuário "nobody" através do NFS?

    

Answer 1

[root@SERVER6B ~]# umount /var/FOODump
[root@SERVER6B ~]# nfsidmap -c
[root@SERVER6B ~]# mount /var/FOODump

resolveu o problema.