can not mount an NFS share from another machine [ Solved ]

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can not mount an NFS share from another machine [ Solved ]

Postby shahzor » Wed Jul 22, 2009 4:46 pm

I have configured NFS on server A and I want to mount the Server A NFS share on Server B.

NFS is running in server A, the showmount -e command shows the its exporting. the SELinux is off, and there is no firewall within the Server A.

in Server B there is no firewall and SELinux is also disabled.

but when i type the command to mount the NFS share I get an erro. the command and error is as follow.

#mount -t nfs 192.168.0.10:/opt /opt
mount: RPC: Timed out

and when I check the server A /var/log/messages it shows me the following error.

refused mount request from 192.168.0.1 for /opt (/): not exported

don't know whats wrong
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Postby lambda » Wed Jul 22, 2009 8:17 pm

what is in /etc/exports on the server? did you restart the nfs processes after editing the file (or maybe run exportfs -va)? is portmap running on both systems? what does "rpcinfo -p" say on the server? what does "rpcinfo -p 192.168.0.10" say on the client? do you have any entries for portmap in /etc/hosts.allow or /etc/hosts.deny?
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Postby shahzor » Thu Jul 23, 2009 12:08 pm

in the /etc/export there is opt directory which is mainly a filesystem, I have restarted the nfs server, I have run the exportfs -va, portmap is running on bothe system, and this the

rcpinfo from server A

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 32769 status
100024 1 tcp 32768 status

and from server B rpcinfo is

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 32768 status
100024 1 tcp 32768 status
100011 1 udp 634 rquotad
100011 2 udp 634 rquotad
100011 1 tcp 637 rquotad
100011 2 tcp 637 rquotad
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 32773 nlockmgr
100021 3 udp 32773 nlockmgr
100021 4 udp 32773 nlockmgr
100021 1 tcp 32772 nlockmgr
100021 3 tcp 32772 nlockmgr
100021 4 tcp 32772 nlockmgr
100005 1 udp 649 mountd
100005 1 tcp 652 mountd
100005 2 udp 649 mountd
100005 2 tcp 652 mountd
100005 3 udp 649 mountd
100005 3 tcp 652 mountd

I do not have any entries for the /etc/host.allow, the TCP wrappers are not configured for the time being.
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Postby lambda » Thu Jul 23, 2009 2:48 pm

don't explain what's in the /etc/exports file. paste the contents here.
rcpinfo from server A

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 32769 status
100024 1 tcp 32768 status
this is very odd. you say you have nfs set up on server A, but i don't see mountd running on server A. i see it running on server B. are you positive you copied and pasted the output of "rpcinfo -p" from the correct servers?
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Postby shahzor » Thu Jul 23, 2009 3:55 pm

okay just wrote B instead of A while writting its running on server A the /etc/exports files looks like

/opt (rw,sync)
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Postby lambda » Thu Jul 23, 2009 4:11 pm

that should be

Code: Select all

/opt client(rw,sync)
where client is the name or ip address of the nfs client.
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Postby shahzor » Thu Jul 23, 2009 4:49 pm

okay after changing the /etc/exports

/opt client IP (rw,sync)

and now when I run the command.

mount -t nfs 192.168.0.10:/opt /share

it gives me the error

mount: RPC: Timed out

and when I check on server A the /var/log/messages

it says that

localhost rpc.mountd: authenticated mount request from 192.168.0.1:634 for /opt (/opt)

on ther server A it says authenticated but the error is the same.
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Postby lambda » Thu Jul 23, 2009 10:24 pm

what's in your /etc/hosts.allow and /etc/hosts.deny files?
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Postby shahzor » Fri Jul 24, 2009 5:54 pm

I din't configure the TCP_Wrappers.
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Postby lambda » Fri Jul 24, 2009 7:31 pm

if you have the files on your system, paste their contents here.
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Postby shahzor » Sat Jul 25, 2009 11:50 am

you mean /etc/hosts.allow and hosts.deny files.

/etc/hosts.allow

cat /etc/hosts.allow
#
# hosts.allow This file describes the names of the hosts which are
# allowed to use the local INET services, as decided
# by the '/usr/sbin/tcpd' server.

cat /etc/hosts.deny

# hosts.deny This file describes the names of the hosts which are
# *not* allowed to use the local INET services, as decided
# by the '/usr/sbin/tcpd' server.
#
# The portmap line is redundant, but it is left to remind you that
# the new secure portmap uses hosts.deny and hosts.allow. In particular
# you should know that NFS uses portmap!
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Postby shahzor » Tue Jul 28, 2009 1:51 pm

finally I got it working, thanks lambda for hosts.allow and hosts.deny

I did the following in server A


/etc/hosts.allow

portmap: 192.168.0.0/55.255.255.0,serverb
mountd: 192.168.0.0/255.255.255.0
rquotad: 192.168.0.0/255.255.255.0
statd: 192.168.0.0/255.255.255.0
lockd: 192.168.0.0/255.255.255.0

and within the /etc/hosts.deny

portmap:ALL
mountd:ALL
rquotad:ALL
statd:ALL
lockd:ALL

and within the /etc/hosts

192.168.0.10 servera a

192.168.0.100 serverb b

and within server b /etc/hosts.

192.168.0.10 servera a

192.168.0.100 serverb b
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Postby shahzor » Wed Jul 29, 2009 3:53 pm

on server A the the filesystem is mounted on /opt. I can share the opt directory on server B through NFS.

but I can't writte on the /opt directory I changed the permissions for the opt directory and within /etc/fstab file I also added the rw.

LABEL=/opt /opt ext3 defaults,rw 1 2

but still I am not able to writte on the /opt directory from server B.

what can be wrong.
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Postby lambda » Wed Jul 29, 2009 7:03 pm

that's because you're trying to write as root. read the man page for exports carefully -- you need no_root_squash.
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Postby shahzor » Thu Jul 30, 2009 10:55 am

thanks lambda that works for now I just added the no_root_squash in /etc/exports file and now I can write on the /opt directory.
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