On 01/28/2016 11:08 AM, Kris Laib wrote:
Soumya,
CTDB failover works great if the server crashes or the NIC is pulled, but I don't believe there's anything in the CTDB setup that would cause it to realize there is a problem if only the glusterfs process responsible for serving NFS is killed but network connectivity with other CTDB nodes remains intact. If others are able to kill just the PID for the associated "NFS Server on localhost" process and have CTDB issue a failover, I'd be very interested to know how their setup differs from mine.
Okay. I have personally never tried out CTDB setup. But FWIH we can
configure CTDB (using a option in ctdbd.conf) to manage any service such
a way that CTDB service as well goes down when the service stops (for
any reason) initiating failover.
CC'in Niels and couple of others who shall be able to help you out here.
Thanks,
Soumya
Thanks for the nfs-ganesha suggestion, I'm not very familiar with that option and don't have enough time in my timeline to properly test it before moving to production, but I will look into it further for a possible solution down the road or if my deadline gets extended. The FUSE client may be a good option for us as well, but I can't seem to get speeds higher than 30 MB/s using the Gluster FUSE client (I posted more details on that earlier today to this group as well, looking for advice there).
-Kris
________________________________________
From: Soumya Koduri <skoduri@xxxxxxxxxx>
Sent: Wednesday, January 27, 2016 8:15 PM
To: Kris Laib; gluster-users@xxxxxxxxxxx
Subject: Re: How to maintain HA using NFS clients if the NFS daemon process gets killed on a gluster node?
On 01/27/2016 09:39 PM, Kris Laib wrote:
Hi all,
We're getting ready to roll out Gluster using standard NFS from the
clients, and CTDB and RRDNS to help facilitate HA. I thought we were
good to know, but recently had an issue where there wasn't enough memory
on one of the gluster nodes in a test cluster, and OOM killer took out
the NFS daemon process. Since there was still IP traffic between nodes
and the gluster-based local CTDB mount for the lock file was intact,
CTDB didn't kick in an initiate failover, and all clients connected to
For gluster-NFS, CTDB is typically configured to maintain high
availability and I guess you have done the same. Could you check why
CTDB hasn't initiated IP failover?
An alternative solution is to use nfs-ganesha [1][2] to provide NFS
support for gluster volumes and can be configured to maintain HA using
gluster CLI.
Thanks,
Soumya
[1]
http://blog.gluster.org/2015/10/linux-scale-out-nfsv4-using-nfs-ganesha-and-glusterfs-one-step-at-a-time/
[2]
http://gluster.readthedocs.org/en/latest/Administrator%20Guide/NFS-Ganesha%20GlusterFS%20Intergration/
(section# Using Highly Available Active-Active NFS-Ganesha And GlusterFS
cli)
the node where NFS was killed lost their connections. We'll obviously
fix the lack of memory, but going forward how can we protect against
clients getting disconnected if the NFS daemon should be stopped for any
reason?
Our cluster is 3 nodes, 1 is a silent witness node to help with split
brain, and the other 2 host the volumes with one brick per node, and 1x2
replication.
Is there something incorrect about my setup, or is this a known downfall
to using standard NFS mounts with gluster?
Thanks,
Kris
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