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theosib
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PostPosted: Sat Mar 26, 2011 11:28 pm    Post subject: HELP: Can't get NFS server to work Reply with quote

I've never been successful at getting NFS to work. This time, I thought if I got help from people on IRC, I'd have more success, but apparently not. I'm hoping I can get some help here.

First of all, I read these two tutorials:

http://en.gentoo-wiki.com/wiki/NFS/Server
http://linux-bsd-sharing.blogspot.com/2008/09/howto-setup-nfs-server-on-gentoo.html

My kernel is configured to support NFS3 and 4. Right now, I'm running 2.6.37. I have installed nfs-utils:
[ebuild R ] net-fs/nfs-utils-1.2.3-r1 USE="ipv6 kerberos nfsv3 nfsv4 tcpd -caps" 0 kB

This is my /etc/exports:

# /etc/exports: NFS file systems being exported. See exports(5).
/home/millerti 192.168.0.0(async,rw,no_subtree_check)
/mnt/backup 192.168.0.0(rw,no_subtree_check)

When I run "/etc/init.d/nfs start", I get this:


nfs | * Exporting NFS directories ... [ ok ] |
nfs | * Starting NFS mountd ... [ !! ] |
nfs | * Starting NFS daemon ... [ ok ] |
nfs | * Starting NFS smnotify ... [ ok ] |
nfs | * ERROR: nfs failed to start

Some other stuff:


# ps -ef | grep nfs
root 7777 2 0 Feb04 ? 00:00:00 [nfsiod]
root 20308 2 0 18:06 ? 00:00:00 [nfsd4]
root 20309 2 0 18:06 ? 00:00:00 [nfsd4_callbacks]
root 20310 2 0 18:06 ? 00:00:00 [nfsd]
root 20311 2 0 18:06 ? 00:00:00 [nfsd]
root 20312 2 0 18:06 ? 00:00:00 [nfsd]
root 20313 2 0 18:06 ? 00:00:00 [nfsd]
root 20314 2 0 18:06 ? 00:00:00 [nfsd]
root 20315 2 0 18:06 ? 00:00:00 [nfsd]
root 20316 2 0 18:06 ? 00:00:00 [nfsd]
root 20317 2 0 18:06 ? 00:00:00 [nfsd]


# ps -ef | grep rpc
root 7740 2 0 Feb04 ? 00:00:00 [rpciod]
root 16967 1 0 17:46 ? 00:00:00 /sbin/rpcbind
root 16984 1 0 17:46 ? 00:00:00 /usr/sbin/rpc.idmapd
nobody 16991 1 0 17:46 ? 00:00:00 /sbin/rpc.statd --no-notify


Not sure what else to look for. I'm also not sure how to get more info. The error is uninformative, and there's nothing relevant in dmesg or /var/log/messages.

Any ideas?

Thanks!
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NeddySeagoon
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PostPosted: Sat Mar 26, 2011 11:39 pm    Post subject: Reply with quote

theosib,

My /etc/exports has 192.168.0.0/24 to specifiy a network. 192.168.0.0 would be a single (illegal) host

To check that the nfs sever works, you can nfs mount a share on the server. This avoids all the issues you get with mismatched UIDs between server and remote boxes.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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krinn
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PostPosted: Sun Mar 27, 2011 12:09 am    Post subject: Reply with quote

and make sure your mountd is working, as the [!!] show it is not and you are exporting nfs3 style, so mountd will be needed.

from any host, you can just rpcinfo -p nfsserverip to grab the info
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theosib
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PostPosted: Sun Mar 27, 2011 12:27 am    Post subject: More info Reply with quote

Thanks for the responses. I tried some of what you suggested.

First, I changed the exports file to this:

/home/millerti 192.168.1.0/24(async,rw,no_subtree_check)
/mnt/backup 192.168.1.0/24(rw,no_subtree_check)

But when I try to start nfs, I still get the same error:

nfs | * Exporting NFS directories ... [ ok ] |
nfs | * Starting NFS mountd ... [ !! ] |
nfs | * Starting NFS daemon ... [ ok ] |
nfs | * Starting NFS smnotify ... [ ok ] |
nfs | * ERROR: nfs failed to start

rcpinfo says this:


# rpcinfo -p 192.168.1.30
program vers proto port
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 43667 status
100024 1 tcp 33239 status
100005 1 udp 46787 mountd
100005 1 tcp 43623 mountd
100005 2 udp 41614 mountd
100005 2 tcp 60995 mountd
100005 3 udp 33011 mountd
100005 3 tcp 47615 mountd
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100227 2 tcp 2049 nfs_acl
100227 3 tcp 2049 nfs_acl
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100227 2 udp 2049 nfs_acl
100227 3 udp 2049 nfs_acl
100021 1 udp 41969 nlockmgr
100021 3 udp 41969 nlockmgr
100021 4 udp 41969 nlockmgr
100021 1 tcp 56719 nlockmgr
100021 3 tcp 56719 nlockmgr
100021 4 tcp 56719 nlockmgr

When I try to mount locally, this happens:

# mount -t nfs localhost:/home/millerti /mnt
mount.nfs: access denied by server while mounting localhost:/home/millerti

What else?

Thanks again.
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NeddySeagoon
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PostPosted: Sun Mar 27, 2011 12:31 am    Post subject: Reply with quote

theosib,


Code:
# mount -t nfs localhost:/home/millerti /mnt
mount.nfs: access denied by server while mounting localhost:/home/millerti
Well, localhost is 127.0.0.1 which is not in your /etc/exports, so thats ok.
Use
Code:
 mount -t nfs 192.168.0.x:/home/millerti /mnt
fill in the IP of the server.

Is there anything in dmsg about things not starting ?
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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theosib
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PostPosted: Sun Mar 27, 2011 1:33 am    Post subject: More tries Reply with quote

# mount -t nfs 192.168.1.30:/home/millerti /mnt
mount.nfs: access denied by server while mounting 192.168.1.30:/home/millerti

I'm not sure what kind of network is 127.0.0.1 (also /24 ?), so I don't know how to add that to exports. Otherwise, I'd try that.


This is all that dmesg says:

NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
NFSD: starting 90-second grace period


Anyhow, I don't think everything's started up right, otherwise I wouldn't get that error when I try to start nfs. Also, since it failed to start, but there's all these processes running, I can't 'stop' it, and I don't know what all processes are associated with nfs, so I don't know which ones to kill manually.
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theosib
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PostPosted: Sun Mar 27, 2011 1:56 am    Post subject: net-fs/nfs-utils-1.2.3-r1 Reply with quote

net-fs/nfs-utils-1.2.3-r1 is an unstable package. It may just be broken. I've filed a bug report:
https://bugs.gentoo.org/show_bug.cgi?id=360677
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theosib
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PostPosted: Sun Mar 27, 2011 2:06 am    Post subject: exportfs Reply with quote

Someone suggested I look at the output of exportfs:


# exportfs
/home/millerti 192.168.1.0/24
/mnt/backup 192.168.1.0/24
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theosib
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PostPosted: Sun Mar 27, 2011 2:50 am    Post subject: Figured it out Reply with quote

Someone on IRC suggested that I stop all the rpc processes. To my knowledge, I'd never started them before, but anyhow, killing them and then restarting nfs did the trick!
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NeddySeagoon
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PostPosted: Sun Mar 27, 2011 11:30 am    Post subject: Reply with quote

theosib,

Well done.
127.0.0.1 is defined as a /8 but its a valid host address too, so 127.0.0.1 would work.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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