CentOS 7
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Elastic Stack : Elasticsearch Cluster
2017/04/12
 
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
[1]
[2] Change settings on all Nodes like follows.
[root@node01 ~]#
vi /etc/elasticsearch/elasticsearch.yml
# line 17: uncomment and change (any name you like)

cluster.name:
elastic-cluster
# line 23: uncomment and change (set Hostanme for node name)

node.name:
${HOSTNAME}
# line 55: uncomment and change (listen all)

network.host:
0.0.0.0
# line 68: uncomment and change (specify all Nodes)

discovery.zen.ping.unicast.hosts:
["10.0.0.51", "10.0.0.52", "10.0.0.53"]
# line 72: uncomment and change

specify [(number of Master Eligible Node) / 2 + 1]

discovery.zen.minimum_master_nodes:
3
[root@node01 ~]#
systemctl restart elasticsearch

[3] If Firewalld is running, allow service ports.
[root@node01 ~]#
firewall-cmd --add-port={9200/tcp,9300/tcp} --permanent

success
[root@node01 ~]#
firewall-cmd --reload

success
[4] Make sure Cluster status. If the status is green, it's OK.
[root@node01 ~]#
curl http://10.0.0.51:9200/_cluster/health?pretty

{
  "cluster_name" : "elastic-cluster",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 3,
  "number_of_data_nodes" : 3,
  "active_primary_shards" : 0,
  "active_shards" : 0,
  "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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