I'm trying to get an nfsv4 server running with Kerberos auth. The usermode server package is inappropriate because it doesn't support locking. So.

Stock xen kernel, 2.6.18.8-domU-linode7 doesn't contain nfsv4 support or rpcsec_gss_krb5. These are obviously both required.

However, nfs support is included in the default server.. sans nfsv4. Since nfs is compiled in, and all of nfs is a single module, I can't simply add nfsv4 support to the kernel as a module. When I try to do turn nfsd into a module and compile that, I get:

cdodt 1 ~% sudo modprobe --force nfsd
WARNING: Error inserting exportfs (/lib/modules/2.6.18.8-domU-linode7/kernel/fs/exportfs/exportfs.ko): Invalid module format
FATAL: Error inserting nfsd (/lib/modules/2.6.18.8-domU-linode7/kernel/fs/nfsd/nfsd.ko): Device or resource busy

This is because they contain overlapping symbols with stuff compiled into the kernel statically.

Anyone have any suggestions for getting working nfsv4 with Kerberos?

[Edited error messages above.]