Best strategy to join two clusters

Elastic Stack Elasticsearch
1

Hi, A customer hand me two clusters, these are in two servers, on each server there are 3 nodes on dockers, what will the best strategy to join these two clusters?

Also I was thinking that would be better to get rid of docker, it is posible to mantain the data and use the only one instance of elastic on the server? I imagine that i have to move all shards to one docker node, but It will be any inconvinience?

Thanks!

2

I feel like cross cluster search and cross cluster replication could help you with moving the data and phasing out one cluster.

3

There is no way to join two clusters in Elasticsearch, and a node that has been a part of one cluster can not be made to join another while retaining data and cluster state. It has to join the new cluter as a new, completely empty node.

You will therefore need to take a snaphot of the data in cluster B and then restore this to cluster A. You can then clear the nodes in cluster B and configure them to join cluster A as new, fresh nodes.

4

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