Elastic Stack 8 : Elasticsearch Cluster2024/08/02 |
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Configure Elasticsearch Cluster. This example shows to configure Elasticsearch Cluster with 3 Nodes and configure each Node is Master Eligible Node and Data Node (default). Each node serves one or more purpose, refer to details below.⇒ https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html |
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| [1] |
Install and Run Elasticsearch on all Nodes. |
| [2] | On the 1st node, start Elasticsearch and generate an enrollment token for other nodes. |
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root@node01:~#
vi /etc/elasticsearch/elasticsearch.yml # line 17 : uncomment and change (any name you like) cluster.name: elastic-cluster
# line 56 : uncomment and change (listen all) network.host: 0.0.0.0
systemctl enable --now elasticsearch root@node01:~# /usr/share/elasticsearch/bin/elasticsearch-create-enrollment-token -s node eyJ2ZXIiOiI4LjE0LjAiLCJhZHIiOlsiMTAuMC4wLjUxOjkyMDAiXSwiZmdyIjoiMTE0N2M1OWE0NjQ5ZTRlYjE1NzdmODUyNzk5ZGIyYWQyYjJkNmFiOTc3NWY0ODE5MWJjMWUyNjg0ZjkzYzE4YyIsImtleSI6Ii1BMlFFSkVCbHNidS1jZ1ByWjlFOlNTeE5ZaElJUVUyS0JQREp6Z1ZFRkEifQ== |
| [3] | On other nodes, join in cluster with an enrollment token generated on the 1st node above. |
root@node02:~# /usr/share/elasticsearch/bin/elasticsearch-reconfigure-node --enrollment-token \ eyJ2ZXIiOiI4LjE0LjAiLCJhZHIiOlsiMTAuMC4wLjUxOjkyMDAiXSwiZmdyIjoiMTE0N2M1OWE0NjQ5ZTRlYjE1NzdmODUyNzk5ZGIyYWQyYjJkNmFiOTc3NWY0ODE5MWJjMWUyNjg0ZjkzYzE4YyIsImtleSI6Ii1BMlFFSkVCbHNidS1jZ1ByWjlFOlNTeE5ZaElJUVUyS0JQREp6Z1ZFRkEifQ== This node will be reconfigured to join an existing cluster, using the enrollment token that you provided. This operation will overwrite the existing configuration. Specifically: - Security auto configuration will be removed from elasticsearch.yml - The [certs] config directory will be removed - Security auto configuration related secure settings will be removed from the elasticsearch.keystore Do you want to continue with the reconfiguration process [y/N]y
root@node02:~#
vi /etc/elasticsearch/elasticsearch.yml # line 17 : uncomment and specify the same name with 1st node cluster.name: elastic-cluster
# line 56 : uncomment and change (listen all) network.host: 0.0.0.0
systemctl enable --now elasticsearch
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| [4] | Verify Cluster status. If the status is green, That's OK. |
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root@node01:~# curl -u elastic --cacert /etc/elasticsearch/certs/http_ca.crt https://node01.srv.world:9200/_cat/nodes?v Enter host password for user 'elastic': ip heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name 10.0.0.52 21 87 8 0.02 0.16 0.09 cdfhilmrstw - node02.srv.world 10.0.0.51 7 94 1 0.02 0.05 0.02 cdfhilmrstw * node01.srv.world 10.0.0.53 20 96 1 0.01 0.08 0.04 cdfhilmrstw - node03.srv.worldroot@node01:~# curl -u elastic --cacert /etc/elasticsearch/certs/http_ca.crt https://node01.srv.world:9200/_cluster/health?pretty
Enter host password for user 'elastic':
{
"cluster_name" : "elastic-cluster",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 3,
"number_of_data_nodes" : 3,
"active_primary_shards" : 1,
"active_shards" : 2,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 100.0
}
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