Gluster users - Nov 2016 - Automation of single server addition to replica

Hello All,

                I'd like to automate a gluster replica cluster in a way that
allows me to later add single servers on the fly.  I can't seem to
understand from the docs how I might achieve this.  It seems logical that a
replica cluster needs to have at least 2 servers initially, but thereafter, I
see no reason that I shouldn't be able to add a single server to the
cluster.  From what I have read, it seems that the number of servers I add in
the future needs to match the number of servers that I started with.

e.g. replica 1 doesn't really make sense, and isn't allowed, but if I
start with replica n; I must always add n servers at a time to the volume, I
can't just add one server to have an n+1 replica...

If anyone could point me in the right direction here, I'd really appreciate
it.

Dan-Joe Lopez

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Replicas are defined in the order bricks are listed in the volume create 
command. So gluster volume create myvol replica 2 server1:/data/brick1 
server2:/data/brick1 server3:/data/brick1 server4:/data/brick1 will 
replicate between server1 and server2 and replicate between server3 and 
server4.

See also 
https://joejulian.name/blog/how-to-expand-glusterfs-replicated-clusters-by-one-server/

On 11/08/2016 03:28 PM, Lopez, Dan-Joe wrote:
>
> Hello All,
>
>                 I?d like to automate a gluster replica cluster in a 
> way that allows me to later add single servers on the fly.  I can?t 
> seem to understand from the docs how I might achieve this.  It seems 
> logical that a replica cluster needs to have at least 2 servers 
> initially, but thereafter, I see no reason that I shouldn?t be able to 
> add a single server to the cluster.  From what I have read, it seems 
> that the number of servers I add in the future needs to match the 
> number of servers that I started with.
>
> e.g. replica 1 doesn?t really make sense, and isn?t allowed, but if I 
> start with replica n; I must always add n servers at a time to the 
> volume, I can?t just add one server to have an n+1 replica?
>
> If anyone could point me in the right direction here, I?d really 
> appreciate it.
>
> Dan-Joe Lopez
>
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
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