NFS doesn’t support udp protocol with Kernel 3.14.14?

[spacedogMember]

So I managed to update the kernel to 3.14.14 and as a result it broke my configuration in automounter-nfs.

I pass the udp option for my NFS automounts like this in /usr/bin/automounter-nfs:

mount -t nfs -o rw,udp,rsize=32768,soft,lookupcache=none,noatime,nolock

After doing further testing I was able to determine the reason it was failing is that after upgrading the kernel, it throws the error:

mount.nfs: an incorrect mount option was specified

Is this a bug? Or does the 3.14.14 kernel use NFS v4 now by default and does that make the udp option no longer valid/deprecated?

[spacedogMember]

OK, I’ve done some further testing and I’m pretty sure that the new kernel is processing mount -t nfs using nfs v4 by default and udp seems to be no longer supported in nfs v4.

This means that the new kernel will break the automounter-nfs package since it passes the udp option on the default install as follows:

mount -t nfs -o ro,udp,rsize=32768,soft,noatime,nolock "$1" "$MNT" >/dev/null 2>&1

There are two ways to resolved this. Either strike the udp flag or add the nfsvers=3 to options. For my config, I have changed it manually to the following and it back to working as usual:

mount -t nfs -o ro,nfsvers=3,udp,rsize=32768,soft,noatime,nolock "$1" "$MNT" >/dev/null 2>&1

[tomlohaveModerator]

Hello,
thanks for the report
I will test on my cuboxi to see what happens too.
anyway, udp is not supported by nfsv4

[spacedogMember]

Just following up on this? Pretty sure automounter-nfs packaged needs to be changed to add the nfsvers=3 flag or have the UDP flag dropped

[Author]

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