Re: Quincy NFS ingress failover

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One more question, for John or anyone:

It looks like Ganesha NFS wants to use dbus to talk to other services (although I'm not sure how well this works across containers).

I just realised that my build (on AlmaLinux 8 'minimal') did not include dbus, and Ceph has not installed it.

I have manually installed the default 'dbus' package and its deps, but this doesn't seem to have had any effect.

 * Does Ganesha use dbus to talk to other services, even in a cephadm
   containerised build?
 * Is there a non-destructive way to make Ganesha retry gsh_dbus_pkginit ?
 * Is the default dbus package sufficient, or does Ceph require
   specific dbus plugins?

Thank you.

On 4/09/2023 9:55 am, Thorne Lawler wrote:

Thanks for getting back to me. I am indeed using cephadm, and I will dig up those configurations.

Even if Ceph Quincy is current completely incapable of configuring its own HA failover, I would really like to know what the /imagined/ process would be for detecting a node failure and failing over.

Can you elaborate about those changes that need to happen, or point me to the forums (ideally the posts_ where this work is broken down in more detail?

It's too late for me to change this; I am 100% committed to using Ceph for HA NFS, no matter what that involves.


On 31/08/2023 11:18 pm, John Mulligan wrote:
On Wednesday, August 30, 2023 8:38:21 PM EDT Thorne Lawler wrote:
If there isn't any documentation for this yet, can anyone tell me:

   * How do I inspect/change my NFS/haproxy/keepalived configuration?
   * What is it supposed to look like? Does someone have a working example?
The configuration for haproxy, keepalive, and ganesha are generated.
I'm assuming you are using cephadm orchestration. If you want to see what it
generated configs contain look in /var/lib/ceph/<FSID>/<svc-name>/
under those dirs may be additional subdirectories like etc/ or config/ (it
varies from service to service)

It's not simple to customize those files directly. It's not impossible but it's
probably not worth it (IMO).

Also, speaking only for my personal opinion, the current NFS situation is one of OK scale-out but is HA in name only. Fail over is not mature. To make it so, changes need to happen throughout the stack including in nfs-ganesha. I know there are some conversations happening around this topic but I don't know
the best place to get involved upstream.

I know this probably isn't very satisfactory, but I hope the information

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Thorne Lawler - Senior System Administrator
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