On Mar 2, 2009, at Mar 2, 2009, 12:41 PM, J. Bruce Fields wrote:
On Tue, Feb 17, 2009 at 03:22:35PM +0000, Pádraig Brady wrote:
I've a problem where reverse DNS is being done by the NFS server.
This is very problematic when the DNS server goes away.
As far as I can see there should be no lookups being performed
because I've nothing in /etc/hosts.{allow,deny} and just
numeric hosts in /etc/exports.
I can simulate this easily by putting a bad nameserver in /etc/
resolv.conf
and restarting the nfs server. Any mounts will take then take ages.
Others seem to have had this issue as well, but possibly with
non numeric names in /etc/exports:
http://marc.info/?l=linux-nfs&m=110977757630297&w=2
http://marc.info/?l=linux-nfs&m=111015343008456&w=2
Here are my config details:
# rpm -q nfs-utils
nfs-utils-1.1.0-6.fc8
# cat /etc/resolv.conf
search company.com
nameserver 192.168.2.110
# cat /etc/exports
/home 192.168.2.25(async,rw,all_squash,anonuid=500,anongid=500)
Any ideas appreciated.
I agree that DNS lookups shouldn't be required in this case.
It's rpc.mountd that's responsible for this, so if you can figure out
where in the mountd code this is happening, it shouldn't be hard to
fix.
That would most likely be matchhostname().
--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com--
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