About elasticsearch node change

Elastic Stack Elasticsearch
1

Hi All.

Now I kept just one node on elasticsearch.
I would like to change from previous server to new server. And then I will add one more server.
So finally I will keep two node cluster.

For this working, I plan to following work:

  1. add new server and make two node cluster( old server + new server)
  2. remove old server (operate only new server)
  3. add new server one more and operate two node cluster (new server + new server)

Is this plan right?
Let me know if this plan is wrong.

Thank you.

2

Assuming your indexes have one replica each this should be okay.

Keep in mind that with a two-node cluster where both nodes are master-eligible you run the risk of a split brain situation. Consider adding a third master-only node to avoid this. The node doesn't need much in terms of CPU and RAM (compared to a data node at least).

3

Thank you for your answer.
Master-node doesn't have data ? right?
What does it doing exactly master node?

4

Please read https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html and come back if you have any further questions.

5

Thank you. :slight_smile: