[trouble shooting]master_not_discovered_exception

엘라스틱 health 확인시 아래와 같이 상태값이 503

# curl -XGET "localhost:9200/_cluster/health?pretty"
{
  "error" : {
    "root_cause" : [
      {
        "type" : "master_not_discovered_exception",
        "reason" : null
      }
    ],
    "type" : "master_not_discovered_exception",
    "reason" : null
  },
  "status" : 503
}

추가확인시 클러스터 uuid값이 나오지 않았음

# curl http://localhost:9200/
{
  "name" : "node-1",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "_na_",
  "version" : {
    "number" : "7.12.0",
    "build_flavor" : "default",
    "build_type" : "rpm",
    "build_hash" : "78722783c38caa25a70982b5b042074cde5d3b3a",
    "build_date" : "2021-03-18T06:17:15.410153305Z",
    "build_snapshot" : false,
    "lucene_version" : "8.8.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

elasticsearch.yml파일 아래와 같이 수정 후 정상

cluster.initial_master_nodes: ["node-1"]

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엘라스틱 재기동 및 확인

# systemctl restart elasticsearch

# curl -XGET "localhost:9200/_cluster/health?pretty"
{
  "cluster_name" : "elasticsearch",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 2,
  "active_shards" : 2,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 1,
  "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" : 66.66666666666666
}

헬스체크 명령어

# curl -XGET 'localhost:9200/_cluster/health?pretty'

# curl -XGET localhost:9200/_cat/indices?v   

# curl -XGET localhost:9200/_cat/shards?v