elasticsearch_installatie

dit document beschrijft de installatie van Elasticsearch

1. voeg ELK stack repository toe
2. installeer elasticsearch
   1. YUM:

      sudo yum install elasticsearch

   2. APT:

      sudo apt-get install elasticsearch

3. activeer de service @boot:
   1. YUM:

      sudo systemctl daemon-reload
      sudo systemctl enable elasticsearch.service

   2. APT:

      systemctl daemon-reload 
      systemctl enable elasticsearch.service

4. indien /tmp directory mount optie noexec heeft, voer onderstaande stappen uit:
   1. open /etc/sysconfig/elasticsearch
   2. voeg toe:

      # Added since /tmp has noexec permission set and JNA needs exec permissions
      ES_TMPDIR=/var/lib/elasticsearch/tmp 

   3. maak de vermelde directory aan en stel toegangsrechten in:

      mkdir /var/lib/elasticsearch/tmp && chown elasticsearch /var/lib/elasticsearch/tmp 

5. start de services:

   sudo systemctl start elasticsearch.service

• stuur een HTTP-request naar de service:

   curl -X GET "localhost:9200/?pretty" 

• output:

   {
    "name" : "kv-tb01",
    "cluster_name" : "elasticsearch",
    "cluster_uuid" : "FkLzX9hMQyGq5WKjkoSkMw",
    "version" : {
      "number" : "7.5.2",
      "build_flavor" : "default",
      "build_type" : "rpm",
      "build_hash" : "8bec50e1e0ad29dad5653712cf3bb580cd1afcdf",
      "build_date" : "2020-01-15T12:11:52.313576Z",
      "build_snapshot" : false,
      "lucene_version" : "8.3.0",
      "minimum_wire_compatibility_version" : "6.8.0",
      "minimum_index_compatibility_version" : "6.0.0-beta1"
    },
    "tagline" : "You Know, for Search"
  }

Ga nu verder met de elasticsearch_configuratie

• open /var/log/elasticsearch/elasticsearch.log

fout: [2020-02-07T14:29:35,151][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [kv-tb01] fatal error in thread [main], exiting java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native
oorzaak: /tmp heeft noexec mount optie.

voeg hier linken toe naar verdere uitleg