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Old 11-08-2013, 10:08 AM   #1
Registered: Nov 2007
Distribution: CentOS 6
Posts: 200

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NFS on CentOS 6 can talk to Centos 5 but not Centos 6 clients

My setup is running nfs and nis. The CentOS 6.x client can't mount CentOS 6.x machine, but can connect fine to a CentOS 5.x. The CentOS 5.x machine can also mount a CentOS 6.x machine fine.

mount.nfs compton:/compton /temp -vvv
mount.nfs: trying text-based options 'vers=4,addr=,clientaddr='
mount.nfs: mount(2): Connection refused

Iptables disabled
SElinux disabled
/compton	@nis1(rw,sync,nohide,root_squash) @nis2(rw,sync,nohide,root_squash)
Old 11-08-2013, 11:08 AM   #2
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#1, never disable SELinux, set it to permissive mode, but dont disable it.

#2. you are being refused connection, that means a user, permission, IP range, etc... something along that line is bad. This is not a NFS issue, but a network permissions issue.

#3. you also do not have any fsid for the exports. that can cause a permissions issue.

#4. try mount -t nfsv4 instead of mount.nfs

#5. have you run exportfs -a
Old 11-08-2013, 03:33 PM   #3
Registered: Nov 2007
Distribution: CentOS 6
Posts: 200

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So it looks like an incompatibility with NFS3 vs NFS4. My CentOS 5.x machines have been running this config for years without issue. As soon as I moved to CentOS 6.x, they default to NFS4. I can force NFS3, but this is not the solution I was hoping for.

On most systems I can do cd /nfs/compton1 for compton:/compton/disk1
This is accomplished via an auto.nfs.
In the end, forcing nfs to mount version 3 in the auto.nfs file fixed
# Issue the output string that autofs needs to make the mount
echo -e "-fstype=nfs,nfsvers=3,rsize=8192,wsize=8192,intr  $$MACHINE$DIRECTORY"


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