From: Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: nfs export switchs to readonly
Date: Wed, 7 Aug 2002 20:47:42 +1000
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <15696.64206.236004.309806@notabene.cse.unsw.edu.au>
References: <20020802140019.D26C5352D0@credativ.de>
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Cc: nfs@lists.sourceforge.net
To: Oliver Korff <oliver.korff@credativ.de>
In-Reply-To: message from Oliver Korff on Friday August 2
Errors-To: nfs-admin@lists.sourceforge.net

On Friday August 2, oliver.korff@credativ.de wrote:
> Hi, 
> 
> I've the following trouble: 
> after some hard traffic or a nfs restart my exports sometimes switches to 
> "ro". I don't have that problem if I boot the server first and all clients 
> connect afterwards. But that gets a little messy because I've got 110 
> clients....
> If I use "exportfs -rv" this usually solves the problem, but not always. 
> 
> 
> kernelversion 2.4.18
> nfs Version 1.0
> distribution: debian/woody
>  
> cat /var/lib/nfs/xtab | grep myotherhost
>  /data01 
> myotherhost.foo.bar(ro,async,wdelay,hide,secure,root_squash,no_all_squash,subtree_check,
> secure_locks,mapping=identity,anonuid=-2,anongid=-2)
> 
> # /etc/exports: the access control list for filesystems which may be exported
> #		to NFS clients.  See exports(5).
> #
> /data01	myhost.foo.bar(rw,no_root_squash)
> /data01	my*.foo.bar(rw)
> /data01	www-linux.foo.bar(rw)
> /data01	*.foo.bar(ro)

You have an ambiguity here.  You have three different rules that apply
to myhost.for.bar.  One is clearly more explicit and so is used.
But myotherhost.foo.bar could clearly match two rules, and it is not
obvious (to a computer) that one match is more explicit than another.
So I guess you get pot-luck.
You need to find a way to be more explicit.
Maybe:
> /data01	myhost.foo.bar(rw,no_root_squash)
> /data01	my*.foo.bar(rw)
> /data01	www-linux.foo.bar(rw)
> /data01	[^m]*.foo.bar(ro)
> /data01	?[^y]*.foo.bar(ro)

NeilBrown


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