Replying for the next guy who run into this (or me if I forgot about it!).
keywords: mount hanging, nfsv4, kerberised nfs, ubuntu nfs.
The only documentation I could find about the NFSv4 protocol are the RFCs.
There is no step by step sequence diagram, but once you start seeing where it
blocks, you can read the chapter pertinent to this, and make sense of it.
Debugging:
---------
I ended up changing my exportfs to be ip based rather than kerberos, and was
able to make the mount work while observing with wireshark, which is as good
as any old sequence diagram! This confirm my suspicions on where the issue was.
Changed "Verbosity = 0" to "Verbosity = 99" in /etc/ipmapd.conf.
Change the RPCMOUNTDOPTS line in /etc/default/nfs-kernel-server to:
RPCMOUNTDOPTS="--manage-gids --debug all"
The quotes here are significant! This gave me the right error in the log that
I was able to finally track down the issue.
Problem: a bug
--------------
https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1077386
Solution
--------
Since the Ubuntu guys say they won't be able to update their package, I just
downloaded the two Debian packages (you need both, but on the server only),
installed them, and now it works:
http://packages.debian.org/wheezy/nfs-common
http://packages.debian.org/wheezy/nfs-kernel-server
I now have NFS between two hosts on the internet located in different towns
with secure authentication and encrypted communication (krb5p). Sweet!
PS: I use smaller VPS providers (need fairly large amount of storage, which
the big guys charge a few arms and legs for), two VPSs from two different
providers located in two different towns, to minimize risk. I have a DB
running on one, writing its redo log on the NFS partition mounted from the
second one, and a DB running on the second, updating itself from the redo log.
--
Yves. http://www.SollerS.ca/
Unix/Linux and Python specialist in Calgary.
http://blog.zioup.org/
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