Add nodes to the cluster on the fly

Elastic Stack Elasticsearch
1

Hello, I have a task to add 2 more nodes in a cluster. Currently we have 5 nodes in a cluster which are all data nodes. Elastic version 7.11.2.

Current discovery parameters set for cluster:

"discovery.zen.ping.unicast.hosts" which lists all 5 data nodes
"discovery.zen.minimum_master_nodes: 3"

My question is which parameters I should set on a new node to it join the cluster on the fly?

  1. Do I need to add "discovery.zen.ping.unicast.hosts" parameter which lists all nodes on a new node? Or "cluster.name" would be enough for a node to join the cluster?
  2. Do I need to change parameter "discovery.zen.ping.unicast.hosts" on current cluster to include new node?

Thanks!

2

Both of these settings were deprecated in 7.0 and you should not be using them any more.

Instead, set discovery.seed_hosts to the addresses of the master nodes only.

3

So if all my 5 nodes are data notes and master nodes, I would list them all in "discovery.seed_hosts" parameter on new nodes?

4

Yes.

5

And if i have minimum of 3 master nodes parameter set up, do I need to change this parameter in the config file on a new nodes?
I have this parameter on initial 5 node cluster:

discovery.zen.minimum_master_nodes: 3

I plan to add 2 new nodes, do I need to change this parameter on a new nodes?

6

No, this setting was deprecated in 7.0 and shouldn't be used.