production elasticsearch parameters

[qjhart]

This adds some basic parameters to elasticsearch for production. Basically locking the memory. A much more complete example would have two clients running, and load balance between them.

Chat GPT's example is:

version: '3.7'

services:
  elasticsearch1:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.0
    container_name: elasticsearch1
    environment:
      - node.name=elasticsearch1
      - cluster.name=my-cluster
      - discovery.seed_hosts=elasticsearch1,elasticsearch2
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms1g -Xmx1g"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    expose:
      - "9200"
      - "9300"
    volumes:
      - esdata1:/usr/share/elasticsearch/data

  elasticsearch2:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.0
    container_name: elasticsearch2
    environment:
      - node.name=elasticsearch2
      - cluster.name=my-cluster
      - discovery.seed_hosts=elasticsearch1,elasticsearch2
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms1g -Xmx1g"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    expose:
      - "9200"
      - "9300"
    volumes:
      - esdata2:/usr/share/elasticsearch/data

  nginx:
    image: nginx:latest
    container_name: nginx
    ports:
      - "9200:9200"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
    depends_on:
      - elasticsearch1
      - elasticsearch2

volumes:
  esdata1:
    driver: local
  esdata2:
    driver: local

Where the ngninx.conf file is :

events {}

http {
    upstream elasticsearch {
        server elasticsearch1:9200;
        server elasticsearch2:9200;
    }

    server {
        listen 9200;

        location / {
            proxy_pass http://elasticsearch;
            proxy_redirect off;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }
    }
}