NFS and permission denied error

[chillywillie]

Hi All,

I've exhausted my knowledge of Linux networking and need some help with a seemingly impossible problem.

What I'm trying to do is very simple, even for me. I'm trying to set up a standard NFS client/server between two machines running Mandrake 10.1 with the default kernel version (2.6.8.1-12mdk). After quadruple checking my configurations and service status, I am receiving "Permission Denied" errors from the server. The funny part (not really) is that I had this working with very little effort a month ago. Then I had to muck with the system and I can't get it working again! I've tried everything I know of and could find online, but to no avail.

I'll post any relevant system configuration files and cmd line output that may help. Do you see anything that I'm missing or misconfiguring??? If there's something else you would like to see, please tell me. Any help at this point is greatly appreciated!

********** Server Config (myserver) *************
/etc/hosts

[root@myserver root]# cat /etc/hosts
127.0.0.1               localhost
129.190.219.122         myserver
129.190.219.116         myclient

/etc/exports

[root@myserver root]# cat /etc/exports
/home/username/src    myclient(rw,no_root_squash,sync)

Checking the export directory's permissions:

[root@myserver root]# ls -l /home/username/
total 12
drwx------  3 username username 4096 Apr 11 04:43 Desktop/
drwxrwxrwx  4 username username 4096 Sep 14 15:19 src/
drwx------  5 username username 4096 Sep 19 14:48 tmp/
[root@myserver root]# ls -l /home/username/src/
total 8
drwxrwxr-x  6 username username 4096 Jun  3 12:47 dir1/
drwxrwxr-x  2 username username 4096 May 30 14:35 dir2/

After this, I did a 'exportfs -ra' to reread the /etc/exports file.

Checking if NFS is running on my server...

[root@myserver root]# rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp    745  status
    100024    1   tcp    748  status
    391002    2   tcp   1024  sgi_fam
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100021    1   udp   1030  nlockmgr
    100021    3   udp   1030  nlockmgr
    100021    4   udp   1030  nlockmgr
    100021    1   tcp   1051  nlockmgr
    100021    3   tcp   1051  nlockmgr
    100021    4   tcp   1051  nlockmgr
    100005    1   udp    761  mountd
    100005    1   tcp    764  mountd
    100005    2   udp    761  mountd
    100005    2   tcp    764  mountd
    100005    3   udp    761  mountd
    100005    3   tcp    764  mountd

Checking what is being exported on my server...

[root@myserver root]# showmount -e localhost
Export list for localhost:
/home/username/src myclient

/etc/hosts.allow and /etc/hosts.deny are deleted

Mandriva's Shorewall firewall is not installed:

[root@myserver root]# rpm -qa | grep shore
[root@myserver root]#

After trying to connect from the client, /var/log/messages appended this line:

[root@myserver root]# tail -1 /var/log/messages
Sep 19 16:18:33 myserver rpc.mountd: authenticated mount request from myclient:934 for /home/username/src (/home/username/src)

********** Client Config (myclient) *************
/etc/hosts

[root@myclient root]# cat /etc/hosts
127.0.0.1               localhost
129.190.219.116         myclient
129.190.219.122         myserver

/etc/fstab

[root@myclient root]# cat /etc/fstab
/dev/hda5 / ext3 noatime 1 1
/dev/hda7 /home ext3 noatime 1 2
/dev/hdc /mnt/cdrom auto umask=0022,user,iocharset=iso8859-1,codepage=850,noauto,ro,exec,users 0 0
/dev/hda1 /mnt/windows vfat umask=0022,iocharset=iso8859-1,codepage=850 0 0
none /proc proc defaults 0 0
/dev/hda6 swap swap defaults 0 0
/dev/sda1 /mnt/removable auto umask=0,user,iocharset=iso8859-1,sync,kudzu,codepage=850,noauto,exec,users 0 0
myserver:/home/username/src /mnt/mydir nfs rw 0 0

Checking the mount point exists (and viewing its owner/permissions):

[root@myclient root]# ls -l /mnt
total 28
drwxr-xr-x   2 root root  4096 Aug 26 15:19 mydir/

Checking what is currently mounted:

[root@myclient root]# mount
/dev/hda5 on / type ext3 (rw,noatime)
none on /proc type proc (rw)
none on /proc/bus/usb type usbfs (rw)
none on /sys type sysfs (rw)
/dev/hda7 on /home type ext3 (rw,noatime)
/dev/hda1 on /mnt/windows type vfat (rw,umask=0022,iocharset=iso8859-1,codepage=850)

/etc/hosts.allow and /etc/hosts.deny are the default for Mandrake's 'standard' security level (blank).

Mandriva's Shorewall firewall is installed, but not running:

[root@myclient root]# rpm -qa | grep shore
shorewall-2.0.17-1.1.102mdk
[root@myclient root]# service shorewall stop
Loading /usr/share/shorewall/functions...
Processing /etc/shorewall/params ...
Processing /etc/shorewall/shorewall.conf...
Loading Modules...
Clearing Shorewall...Processing /etc/shorewall/stop ...
   WARNING: DISABLE_IPV6=Yes in shorewall.conf but this system does not appear to have ip6tables
IP Forwarding Enabled
Processing /etc/shorewall/stopped ...
done.

My attempt to mount the file system...

[root@myclient root]# mount /mnt/mydir/
mount: myserver:/home/username/src failed, reason given by server: Permission denied

[jimbaloo]

I can't tell from what you have posted what might be causing your nfs woes but here are some of the web sites that I found helpfull in sorting out my own problems.
nfs gotchas
iptables
home networking

All three of these sites had useful information but I had to do a lot of reading before I found what I was looking for. I think the gotchas page was probably most helpful in the end for me.

Good luck and enjoy your reading

[whats]

you can solve the problem adding the following lines in /etc/fstab on the server side:

nfsd /proc/fs/nfsd nfsd auto,defaults 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs auto,defaults 0 0

Then type on the server
mount -a

And try to mount de resource in the client

--
Albert Sellarès GPG id: 0xB88C621A
http://www.wekk.net whats_up@jabber.org
Membre de Catux.org http://catux.org
Linux User: 324456 Catalunya

[chillywillie]

I had looked through countless man pages, wiki's, forums, and howtos and haven't come across anything that told me I should try modifying my server's /etc/fstab settings! The first line (nfsd /proc/fs/nfsd nfsd auto,defaults 0 0) solved the problem. The second line (sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs auto,defaults 0 0) was invalid on my distro.

After adding the two lines:

[root@turtle gaudetteje]# mount -a
mount: mount point /var/lib/nfs/rpc_pipefs does not exist
[root@turtle gaudetteje]# mount
/dev/hda1 on / type ext3 (rw)
none on /proc type proc (rw)
none on /proc/bus/usb type usbfs (rw)
none on /sys type sysfs (rw)
/dev/hda6 on /home type ext3 (rw)
none on /mnt/floppy type supermount (rw,sync,dev=/dev/fd0,fs=ext2:vfat,--,umask=0,iocharset=iso8859-1,codepage=850)
nfsd on /proc/fs/nfsd type nfsd (rw)
[root@turtle gaudetteje]#

I'm grateful that you were able to discern why this was not working, but I fail to see how this causes the permission denied error to go away. Can you enlighten me?

Thank you!

[whats]

First of all, sorry because my english is not ok.

I had already bumped into this bug.

This is an error that made me breaking the boss. With the error "permision denied", is impossible to solve the problem.


Greetings!

[flaxrt]

Works just fine.10x a lot.

you can solve the problem adding the following lines in /etc/fstab on the server side:

nfsd /proc/fs/nfsd nfsd auto,defaults 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs auto,defaults 0 0

Then type on the server
mount -a

And try to mount de resource in the client

--
Albert Sellarès GPG id: 0xB88C621A
wekk.net - "Person who say it cannot be done should not interrupt person doing it." whats_up@jabber.org
Membre de Catux.org Catux - Portada
Linux User: 324456 Catalunya