9. Elasticsearch 상태 정보 보기(cluster, shard, index, node)

Cluster Health 체크

curl -u <user>:<passwd> -XGET 127.0.0.1:9200/_cluster/health?pretty

{
  "cluster_name" : "elasticsearch",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 314,
  "active_shards" : 314,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 295,
  "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" : 51.55993431855501
}

status가 yellow 인 이유는 node가 1개 이고 할당된 replica shard 가 없기 때문이다.

replica 수를 강제로 0으로 설정하면 status 가 green으로 변경된다.

curl -XPUT 'localhost:9200/_settings?pretty' -H 'Content-Type: application/json' -d '{"index":{"number_of_replicas": 0}}'

참조 : https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html

 

 

index 조회

curl -u <user>:<passwd> -XGET 127.0.0.1:9200/_cat/indices?v

health status index                 	uuid                   		pri rep docs.count docs.deleted store.size pri.store.size
yellow open   filebeat-2024.06.06   	1T7dKzhKS8ao7aQyyn70Cg   	1   1          0            0       226b           226b
yellow open   filebeat-3-2024.05.29 	CjtI53Sd-bVI2TTsTv4A   		1   1          0            0       226b           226b

각 index 별로 primary shard와 replica shard가 각각 한개씩 설정되어있다. 실제로 할당된것은 아니며 실제 할당은 shard 조회를 통해 확인 할 수 있다. 

참조 : https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-indices.html

 

 

shard 조회

curl -u <user>:<passwd> -XGET 127.0.0.1:9200/_cat/shards?v

filebeat-2024.06.06	0     p      STARTED           0     226b 1.1.1.1 testhost
filebeat-2024.06.06	0     r      UNASSIGNED

primary shard는 할당되었지만 replica shard는 할당되어 있지 않다.

특정 index의 shard 정보를 확인하려면 :
curl  -XGET 127.0.0.1:9200/_cat/shards/<index>?v

참조 : https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-shards.html

 

 

shard가 할당된 디스크 및 node 정보

curl -u <user>:passwd> -XGET 127.0.0.1:9200/_cat/allocation?v

shards disk.indices disk.used disk.avail disk.total disk.percent host          ip            node
   314      107.9gb   124.7gb     73.2gb    197.9gb           62 1.1.1.1 	1.1.1.1 		testhost
   295                                                                                       UNASSIGNED

cluster health 에서 ""active_primary_shards" : 314" 와 "unassigned_shards" : 295 의 할당 디스크 및 node 정보를 확인할 수 있다.

참조 : https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-allocation.html

 

 

Node 정보

curl -u <user>:passwd> -XGET '127.0.0.1:9200/_cat/nodes?v=true'

ip            heap.percent ram.percent cpu load_1m load_5m load_15m node.role   master name
172.16.10.1              3          59   2    0.01    0.16     0.23 cdfhilmrstw *      test-ES01
172.16.10.2              3          60   0    0.01    0.14     0.16 cdfhilmrstw -      test-ES02
172.16.10.3              3          61   0    0.01    0.12     0.14 cdfhilmrstw -      test-ES03

 

Query parameters

curl -u <user>:passwd> -XGET '127.0.0.1:9200/_cat/nodes?v=true&h=<parameters>'

curl -XGET 'http://172.16.10.1:9200/_cat/nodes?v=true&h=id,cpu,uptime,disk.used_percent,heap.current'
id   cpu uptime disk.used_percent heap.current
OCbV   1    36m              6.47        248mb
lRjs   1  35.7m              6.47        352mb
kjhJ   1  35.3m              6.52      857.5mb

참조 : https://www.elastic.co/guide/en/elasticsearch/reference/current/cat-nodes.html#cat-nodes-api-query-params