Question

我使用docker-compose在我的本地计算机（mac）上创建了一个简单的elasticsearch“cluster”。配置如下所示

version: '2.2'
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.2.4
    environment:
      - cluster.name=elasticsearch
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "index.number_of_replicas: 1"
      - "index.number_of_shards: 2"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata1:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
    networks:
      - esnet

volumes:
  esdata1:
    driver: local

networks:
  esnet:

现在我想向此群集添加一个新的es节点，但我不知道如何继续。我尝试使用以下命令运行docker容器：

docker run -e "cluster.name=elasticsearch" -e "bootstrap.memory_lock: true" -e "ES_JAVA_OPTS=-Xms512m -Xmx512m" -e "discovery.zen.ping.unicast.hosts=localhost:9200" -e "network.host: _local_"  -v esdata2:/usr/share/elasticsearch/data docker.elastic.co/elasticsearch/elasticsearch:6.2.4

但这似乎创建了一个单独的群集/节点，因为当我尝试访问http://127.0.0.1:9200/_cluster/health?pretty时，我仍然只看到一个节点：

{
  "cluster_name" : "elasticsearch",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "active_primary_shards" : 1,
  "active_shards" : 1,
  "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
}

我不确定我应该如何创建新的es节点并将其添加到我的群集中。我是否需要再次使用docker-compose，或者我在docker run中指定的标志是否错误？

Answer 1

正如official doc of Elasticsearch

所述

您需要在docker-compose.yml文件中指定节点，如下所示：

version: '2.2'
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.2.4
    container_name: elasticsearch
    environment:
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata1:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
    networks:
      - esnet
  elasticsearch2:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.2.4
    container_name: elasticsearch2
    environment:
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "discovery.zen.ping.unicast.hosts=elasticsearch"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata2:/usr/share/elasticsearch/data
    networks:
      - esnet

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

networks:
  esnet:

Answer 2

根据此https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html
弹性网站上的文章，您应该为每个弹性实例指定群集名称，发现种子主机的名称。

i=0
width = 0.25
gap = .02
cols = ['BKNG','MCD','YUM']
colors= ['b','g','r']
for col in cols:
    ax.bar(df.index+(i*(width+gap)), df[col], color = colors[i], width = width, label=col)
    i+=1

将新节点添加到通过docker-compose创建的elasticsearch集群

2 个答案: