Just 1 docker swarm node is visible in Kibana

[albert2022 (Albert)]

Hi,

We configured a cluster using the docker swarm based on the following yml file:

version: '3.8'

services:
  node-master:
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.elastic.replica == 0
      restart_policy:
        condition: on-failure
    image: "docker.elastic.co/elasticsearch/elasticsearch:7.17.0"
    environment:
      - cluster.name=elk
      - node.name=node-master
      - network.publish_host=_eth1_
      - discovery.seed_hosts=node-master,node1,node2
      - bootstrap.memory_lock=true
    volumes:
      - /data/Elastic/ElasticLog:/usr/share/elasticsearch/logs:rw
      - /data/Elastic/ElasticData:/usr/share/elasticsearch/data:rw
      - /data/Elastic/ElasticConfig:/usr/share/elasticsearch/config:rw
    ports:
      - 9200:9200
      - 9600:9600
    networks:
      - elk
  node1:
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.elastic.replica == 1
      restart_policy:
        condition: on-failure
    image: "docker.elastic.co/elasticsearch/elasticsearch:7.17.0"
    environment:
      - cluster.name=elk
      - node.name=node1
      - network.publish_host=_eth1_
      - discovery.seed_hosts=node-master,node1,node2
      - bootstrap.memory_lock=true
    volumes:
      - /data/Elastic/ElasticLog:/usr/share/elasticsearch/logs:rw
      - /data/Elastic/ElasticData:/usr/share/elasticsearch/data:rw
      - /data/Elastic/ElasticConfig:/usr/share/elasticsearch/config:rw
    ports:
      - 9201:9200
    networks:
      - elk
  node2:
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.elastic.replica == 2
      restart_policy:
        condition: on-failure
    image: "docker.elastic.co/elasticsearch/elasticsearch:7.17.0"
    environment:
      - cluster.name=elk
      - node.name=node2
      - network.publish_host=_eth1_
      - discovery.seed_hosts=node-master,node1,node2
      - bootstrap.memory_lock=true
    volumes:
      - /data/Elastic/ElasticLog:/usr/share/elasticsearch/logs:rw
      - /data/Elastic/ElasticData:/usr/share/elasticsearch/data:rw
      - /data/Elastic/ElasticConfig:/usr/share/elasticsearch/config:rw
    ports:
      - 9202:9200
    networks:
      - elk   
  kibana:
    image: "docker.elastic.co/elasticsearch/elasticsearch:7.17.0"
    environment:
      ELASTICSEARCH_HOSTS: '["http://node-master:9200","http://node1:9200","http://node2:9200"]'
    ports:
      - 5601:5601
    networks:
      - elk
# Create networks manually before run
networks:
  elk:
    external: true

Everything looks fine, the 4 services(ELK nodes and 1 Kibana) are running, but when I look to the health of the cluster from Kibana

GET /_cluster/health

or also using the command

curl http://xxx:9200/_cluster/health?pretty

it shows just 1 node:

{
  "cluster_name" : "elk",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 3,
  "active_shards" : 3,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 0,
  "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" : 100.0
}

{
  "nodes" : {
    "U5DpQZEaS4ig3mP8DF1zDg" : {
      "name" : "node1"
    }
  }
}