Multiple connectable instances

[teceP]

Is it possible to have multiple instances, which can communicate with each other?
Instance A runs in a DMZ internal zone and would keep sensible data.
Instance B runs external and keeps everything else.
Sometimes instance A would send sensible data to instance B. This data must be deleted after a certain time (TTL?).

[martinsumner]

By instance do you mean cluster? Data in Riak is not organised so that specific data is allocated to specific instances, data is shared across instances in a cluster.

You can have different clusters with overlapping data sets, with replication between the clusters. There are some recent features added to Riak to allow for per-bucket replication and synchronisation - so Cluster A may have the KVs associated with Bucket A, and Cluster B can replicate Bucket A, but also have Bucket B that doesn't replicate to Cluster A.

However, Riak is not really designed to be run in hostile security environments like DMZ. There are a series of security features - but running Riak exposed outside of trusted environments is not a major focus of our design and testing effort.