Hi again,
more questions related to clustering, specifically NFS and CIFS
(Samba). My initial thoughts were that setting up the cluster would be
the hard part and the NFS/CIFS piece would be relatively simple. Casual
reads of RedHats literature says things like "built in support for NFS
and Samba". I have read and re-read the docs, as well as scouring the
net and I am finding that there is very little in the way of *actual*
documentation on how to setup failover services for either using RedHat
Cluster Suite.
As of now, I have GFS filesystems which are mounted on both nodes of a
2-node cluster. The NFS daemon is started on both and both have
identical /etc/exports. In the cluster, I have a Virtual IP resource and
it is the sole resource of my NFS "service".
This is a rather simple setup (once I figured it out) and I have
confirmed that I can fail either node and have the virtual IP move to
the other and NFS is still accessible.
Next I was trying to figure out the CIFS piece of the puzzle, and
started wondering how this would work with "security = domain" since the
Samba server is joined to an AD domain. I couldn't figure out how the
secret key would be managed between 2 (or more) nodes until I ran across
someone mentioning moving that data to a GFS filesystem and then linking
back to it. But then I thought, I can't have 2 active Samba nodes
running sharing the same state data...
In the course of searching, I also discovered (and found somewhere in
the RedHat docs) that NFS locking is not maintained across a failover!
So, I finally discovered CTDB (http://ctdb.samba.org) and it seems like
it could be the solution to both the NFS and CIFS clustering concerns I
have had.
My questions are:
1) Is anyone really using RedHat Cluster Suite for failover NFS and/or
CIFS?
1b) if so, can you provide some specifics on HOW you are doing
so?
1c) does it adequately handle NFS file locking and state
information? What about CIFS?
2) Is anyone using CTDB for failover NFS and/or CIFS?
2b) does it adequately handle NFS file locking and state
information? What about CIFS?
In addition, I would be happy to hear any additional opinions or input
on your real-world experience with RHCS and/or CTDB, as well as any good
reference sources (besides the manuals, which I already know of and have
read).
Thanks again - I relish having access to this forum where there is a
wealth of opinion and knowledge.
Kevin
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