This doesn't answer your question, but maybe nudges you in a different direction. CephFS seams like the much better solution for what you're doing. You linked a 5 year old blog post. CephFS was not a stable technology at the time, but it's an excellent method to share a network FS to multiple clients. There are even methods to export it over nfs, although I'd personally set them up to mount it using ceph-fuse.
On Thu, Nov 30, 2017, 2:34 AM Hauke Homburg <hhomburg@xxxxxxxxxxxxxx> wrote:
Hello,
Actually i am working on a NFS HA Cluster to export rbd Images with NFS.
To test the failover i tried the following:
https://www.sebastien-han.fr/blog/2012/07/06/nfs-over-rbd/
i set the rbdimage to exclusive Lock and the osd and mon timeout to 20
Seconds.
on 1 NFS Server i mapped the rbd image with rbd map. after mapping i
blocked the TCP ports with iptables to simulate a network outage. Ports
tcp 6789 and 6800:7300.
I can see with rbd status that the watchers on the CLuster itself are
unmapped after timeout.
The nfs server gives encountered watch error -110.
The NFS Server tries to connect libceph to another mon.
When all this happens i cannot unmap the image.
Ceph CLuster is 10.2.10 with Centos 7 the NFS Server is Debian 9. The
Pacemaker ra is ceph-resource.agents 10.2.10.
My consideration is to unmap the image when the network outage happens,
because the failover and the Problem that i don't want to mount 1 rbd
image with 2 Server to prevent data damage. after network outage is solved.
Thanks fpr Help
Hauke
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