Re: Cephfs NFS failover

[Adrian Saul <Adrian.Saul@xxxxxxxxxxxxxxxxx>]

 

What I have been doing with CephFS is make a number of hosts export the same CephFS mountpoints i.e

 

cephfs01:/cephfs/home

cephfs02:/cephfs/home

…

 

I then put the hosts all under a common DNS A record i.e “cephfs-nfs” so it resolves to all of the hosts exporting the share.

 

I then use autofs on the clients to mount the share as needed with the source host being “cephfs-nfs:/cephfs/home”.  Autofs will automatically pick one of the hosts to mount and in the event it becomes unavailable autofs will remount using one of the other hosts in the A record.

 

If you wanted you could get more funky with the automount maps and use priorities and list the hosts individually, but the above is simple and seems to works well.

 

 

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Smith, Eric
Sent: Thursday, 21 December 2017 7:36 AM
To: nigel davies <nigdav007@xxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx
Subject: Re: Cephfs NFS failover

 

We did this with RBD, pacemaker, and corosync without issue - not sure about CephFS though. You might have to use something like sanlock maybe?

 

---

From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of nigel davies <nigdav007@xxxxxxxxx>
Sent: Wednesday, December 20, 2017 12:45 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Cephfs NFS failover

 

Hay all

 

Can any one advise on how it can do this.

 

I have set up an test ceph cluster 

 

3 osd system

2 NFS servers 

 

I want to set up the two NFS serves as an failover process. So if one fails the other starts up.

 

I have tried an few ways and getting stuck any advise would be gratefully received on this one 

 

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