Steps to Configure Node Roles
1. Access the Elasticsearch Configuration File
The primary configuration file for Elasticsearch is elasticsearch.yml, typically located in /etc/elasticsearch/ or the config directory within your Elasticsearch installation.
2. Edit the elasticsearch.yml File
Open the elasticsearch.yml file in a text editor. We will be specifying the node roles within this file.
3. Define Node Roles
Add the node. roles setting to the elasticsearch.yml file and specify the desired roles. Here are examples of different configurations:
4. Configure Additional Settings (Optional)
Depending on the node roles, you may need to adjust other settings. For example, you might want to increase the heap size for data nodes or set specific settings for master node election:
Heap size:
-Xms2g
-Xmx2g
Master Node Selection:
discovery.seed_hosts: ["node1", "node2", "node3"]
cluster.initial_master_nodes: ["node1", "node2", "node3"]
5. Save and Close the Configuration File
After making the necessary changes, save and close the elasticsearch.yml file.
6. Restart Elasticsearch Nodes
Restart each Elasticsearch node to apply the new configuration. The method to restart will depend on your operating system. For example, on a system-based Linux distribution, you can use:
sudo systemctl restart elasticsearch
7. Verify the Configuration
After the nodes restart, verify the configuration by checking the cluster state and node roles. You can use the Elasticsearch API for this purpose:
curl -X GET "localhost:9200/_cat/nodes?v"
How to Configure all Elasticsearch Node Roles?
Elasticsearch is a powerful distributed search and analytics engine that is designed to handle a variety of tasks such as full-text search, structured search, and analytics. To optimize performance and ensure reliability, Elasticsearch uses a cluster of nodes, each configured to handle specific roles.
Understanding and properly configuring these node roles is essential for managing Elasticsearch effectively. In this article, we will go through the What is Nodes, different types of Nodes their roles in an Elasticsearch cluster.