Hi Jesse,

all Graylog nodes must access and use the same MongoDB database. MongoDB 
itself can of course be replicated to achieve a HA setup, see 
http://docs.mongodb.org/manual/core/replication-introduction/ for details.


Cheers,
Jochen

On Tuesday, 29 September 2015 23:22:50 UTC+2, Jesse Skrivseth wrote:
>
> Hello all!
>
> I have three nodes, a master and two backend nodes. On the backend nodes, 
> it seems that mongo is not replicated since I don't see the graylog DB on 
> either node. That makes the master node a single point of failure? If each 
> of the three nodes should be able to assume the role of master, what's the 
> best way to go about this? Also, when upgrading Graylog versions, should 
> the entire cluster be stopped or can each node be upgraded while the rest 
> of the cluster is hot?
>
> Thanks!
>

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