[Gluster-users] NFS availability

[James]

On Thu, 2013-01-31 at 09:07 -0800, Joe Julian wrote:
> That doesn't lend me much confidence in your expertise with regard to 
> your other recommendations, Stephan.
> 
> There are two good ways to make this work even if a server is down:
I'd just like to add one more option to the already excellent list that
Joe has provided. It happens to be my favourite: VRRP. You can use
something like Keepalived or even cman+rgmanager+an ip resource, to
manager a "virtual IP". Each of your servers has an IP, and then this
extra VIP moves around automatically based on what is actually up, and
where you want the mount to come from.

If you want to be particularly fastidious, then I suppose you could even
create a second VIP (which defaults to a different "base" node, and
which you use the below "backupvolfile-server" option.

VRRP has the added benefit that the failover happens within seconds, and
can be set manually if for some reason you want to choose which volfile
server you have.

HTH,
James


> 
>   * Round robin DNS. A hostname (ie. glusterfs.domain.dom) with
> multiple
>     A records that point to all your servers. Using that hostname in
>     fstab will allow the client to roll over to the additional servers
>     in the event the first one it gets is not available (ie.
>     "glusterfs.domain.dom:myvol /mnt/myvol glusterfs defaults 0 0").
>   * The mount option backupvolfile-server. An fstab entry like
>     "server1:myvol /mnt/myvol glusterfs backupvolfile-server=server2 0
>     0" will allow the mount command to try server2 if server1 does not
>     mount successfully.
> 
> This whole idea is obvious experience and forethought, not nonsense.
> By 
> having a management service that provides configuration, on-the-fly 
> configuration changes are possible. If one "denies to fetch the
> volfile" 
> one cripples their cluster's flexibility.

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