What does discovery.seed_hosts and cluster.initial_master_nodes mean in ES

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I am using ES 7.10.1, and I am reading https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html#unicast.hosts.

I have 5 master nodes (node.master: true node.data: false) and 20 data nodes(node.master: false node.data: true).

I got following four questions:

  1. Should both discovery.seed_hosts and cluster.initial_master_nodes be specified with the master nodes? I mean, could I specify the data node for these two configurations?

  2. Since I have 5 master nodes in my case, how many nodes should I specify for these two configurations. I think I don't have to list all of these 5 nodes in these configurations?

  3. It looks to me that discovery.seed_hosts is like old version elastic search's discovery.zen.ping.unicast.hosts?

  4. It looks to me that cluster.initial_master_nodes is like old version elastics search's discovery.zen.minimum_master_nodes?

Thanks!

elasticsearch
1 Answers
  1. It is recommended to add the setting in at least 3 master nodes for fault tolerance.
  2. I would put all 5 to avoid confusion
  3. Yes it is but will still work for legacy
  4. Yes it is but will still work for legacy

Remember that cluster.initial_master_nodes is used once after the cluster bootstrapping then will be ignored and it is recommended to remove it from the configuration.

Cluster bootstrapping

Cluster Settings

In short discovery.seed_hosts is the list of master nodes a new node uses to join the cluster, and cluster.initial_master_nodes is the initial list to bootstrap a cluster.

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