Tuesday, September 4, 2012

Migrating to NFSv4 on FreeBSD

I was recently tasked with configuring an existing FreeBSD NFSv3 server to allow NFSv4 mounts. We don't care about v4 security at this point, just that the v4 protocol is being used. The FreeBSD handbook does not yet have any content discussing the configuration of a v4 server, and I was not able to find any good resources on Google. The nfsv4 man pages were informative, but not helpful. Here is the nutshell version of what I finally figured out.

On the NFS server, the following changes need to be made. These notes assume that you already have a working NFSv3 server.

# /etc/rc.conf changes


# /etc/exports changes
# The 'V4' line defines the root of your NFSv4 tree. As I
# understand it, the paths you want exported must also be listed
# in the exports file, the same way they are for v3.
V4: /
/home -alldirs -maproot=root: -network=

To mount the filesystem on the client using NFSv4, you must add the nfsv4 option to the mount command.

root@client:~-> mount -t nfs -o nfsv4 server:/home /mnt
root@client:~-> mount
server:/home on /mnt (nfs, nfsv4acls)

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