Creating a master node and data node

Elastic Stack Elasticsearch
#1

Hi,

Reading the manual I am still uncertain how to make a node as master node and how to make a node as data node
(here is the manual I used)

In the manual It is written that:

To create a standalone master-eligible node, set:

node.master: true
node.data: false
node.ingest: false

Where do I write this? I didnt find something like this in elasticsearch.yml

  • Also there is a brief explanation in the same guide to what is a "node":

Any time that you start an instance of Elasticsearch, you are starting a node

I didnt understand from this exactly what a node is. From my understanding cluster is a bunch of nodes and a node is a bunch if indices and the logs/data flows to the indices. Is this true?

#2

That is the place to do it. If it's not there, then just add it.

A node is just a single java process that is running the ES binary.

1 Like
#3

Thanks!

#4

For small clusters not under heavy load there may not be any need for dedicated master nodes. When starting out with a small cluster, it is generally sufficient to set up 3 nodes where all nodes are master eligible and also hold data, which is the default configuration. Having 3 nodes in the cluster will give you high availability as the two remaining nodes will be able to make a majority decision to elect a new master if the current master was to disappear (through crash, network partition or excessive GC).

The cluster as a whole holds indices and data. If nodes crash, the cluster will redistribute the data automatically to try to ensure all primary and replica shards are assigned.

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#5

Thanks @Christian_Dahlqvist I probably will have a heavy load on my Cluster. Therefor should I create more nodes? Also how do I create a few nodes?

#6

How many hosts are you looking to use for your cluster? The configuration parameters you need to look at are described here.

1 Like
#7

Thanks!
I will look there.
I believe there will be about 12 machines (4 of them will be heavy duty) emitting logs through filebeat/logstash to the elasticsearch

#8

Set up 3 dedicated master nodes. These do not do a lot of work, so do not need to be very powerful, but are essential for cluster stability. Requests should be routed directly to the data nodes.

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#9

How do I set up extra nodes? I know that after doing so I just need to add to it:

node.master: true
node.data: false

but I just dont know how to do it

From my understanding for every cluster there could be multiple nodes but I don't know how to add nodes

#10

Install Elasticsearch on each of the hosts that are to make up the cluster. Locate the elasticsearch.yml file (location depends on how you install Elasticsearch) and update the settings I linked to. As you are connecting nodes distributed across multiple hosts, make sure that you pay attention to the bootstrap checks.

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#11

First of all thank you a lot!
I am getting a much better understanding of the subject thanks to you!

Just to make sure, basically when the manual says:
On one ES there can be one node, but when there are extra ES each one of them have a node and we can connect them all together

#12

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