[ELK] 2. Elastic Search 설정 및 실행

                                    # 설치 명령어
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.14.3-linux-x86_64.tar.gz

                                    ⚠️ Elastic Search 설정을 깊게 이해하기 위해서는 반드시 Before-Elastiscearch 깊게 보기를 보고 와주세요.

                                    cluster.name: my-practice-cluster
node.name: node-1

# Set to single-node discovery type
discovery.type: single-node

# path
path.data: <your-path> # ✍️ stores all its data files
path.logs: <your-path> # ✍️ startup log, error log, query performances ...

# Network set
network.host: 127.0.0.1
http.port: 9200 # default

# security
👉 관련설정은 아래 x-pack 관련 오류에서 확인

                                    $ ./bin/elasticsearch-setup-passwords auto
******************************************************************************
Note: The 'elasticsearch-setup-passwords' tool has been deprecated. This       command will be removed in a future release.
******************************************************************************

Initiating the setup of passwords for reserved users elastic,apm_system,kibana,kibana_system,logstash_system,beats_system,remote_monitoring_user.
The passwords will be randomly generated and printed to the console.
Please confirm that you would like to continue [y/N]y

Changed password for user apm_system
PASSWORD apm_system = <pw>

Changed password for user kibana_system
PASSWORD kibana_system = <pw>

Changed password for user kibana
PASSWORD kibana = <pw>

Changed password for user logstash_system
PASSWORD logstash_system = <pw>

Changed password for user beats_system
PASSWORD beats_system = <pw>

Changed password for user remote_monitoring_user
PASSWORD remote_monitoring_user = <pw>

Changed password for user elastic
PASSWORD elastic = <pw>

                                    $ curl -u elastic:<pw> -X GET "http://localhost:9200/"

👉 response
{
  "name" : "node-1",
  "cluster_name" : "my-practice-cluster",
  "cluster_uuid" : "hPnIhFfTT3KjRmBUzVmCYQ",
  "version" : {
    "number" : "8.14.3",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "d55f984299e0e88dee72ebd8255f7ff130859ad0",
    "build_date" : "2024-07-07T22:04:49.882652950Z",
    "build_snapshot" : false,
    "lucene_version" : "9.10.0",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}

                                    #index 생성 - lowercase 만 사용
curl -u elastic:<pw> -X put "http:localhost:9200/text"
👉 response
{"acknowledged":true,"shards_acknowledged":true,"index":"test"}

# HTTP Json 통신
curl -u elastic:9jgjqri6igh5DCKtEyq2
-X POST "http://localhost:9200/test/_doc" -H 'Content-Type: application/json' -d '{
  "title": "Sample Document",
  "content": "This is some data saved via curl."
}'

👉 response
{
  "_index": "test",
  "_id": "hiQDNpgBnZBPcwzw0c29",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 3,
  "_primary_term": 1
}

                                    $ curl -u elastic:9jgjqri6igh5DCKtEyq2 -X GET "http://localhost:9200/test/_doc/hiQDNpgBnZBPcwzw0c29?pretty=true"

👉 response
{
  "_index" : "test",
  "_id" : "hiQDNpgBnZBPcwzw0c29",
  "_version" : 1,
  "_seq_no" : 3,
  "_primary_term" : 1,
  "found" : true,
  "_source" : {
    "title" : "Sample Document2",
    "content" : "This is some data saved via curl."
  }
}