ElasticSearch(4) 集群
1、 elasticsearch.yml 配置文件详解
config目录下的elasticsearch.yml 文件
# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
# Before you set out to tweak and tune the configuration, make sure you
# understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
# 集群名称，默认是elasticsearch
#cluster.name: my-application
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
# 节点名称，默认从elasticsearch-2.4.3/lib/elasticsearch-2.4.3.jar!config/names.txt中随机选择一个名称
#node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
# 可以指定es的数据存储目录，默认存储在es_home/data目录下
#path.data: /path/to/data
#
# Path to log files:
# 可以指定es的日志存储目录，默认存储在es_home/logs目录下
#path.logs: /path/to/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
# 锁定物理内存地址，防止elasticsearch内存被交换出去,也就是避免es使用swap交换分区
#bootstrap.memory_lock: true
#
# 确保ES_HEAP_SIZE参数设置为系统可用内存的一半左右
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# 当系统进行内存交换的时候，es的性能很差
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
# 为es设置ip绑定，默认是127.0.0.1，也就是默认只能通过127.0.0.1 或者localhost才能访问
# es1.x版本默认绑定的是0.0.0.0 所以不需要配置，但是es2.x版本默认绑定的是127.0.0.1，需要配置
# Set the bind address to a specific IP (IPv4 or IPv6):
#
# network.host: 192.168.0.1
#
#
# 为es设置自定义端口，默认是9200
# 注意：在同一个服务器中启动多个es节点的话，默认监听的端口号会自动加1：例如：9200，9201，9202...
# Set a custom port for HTTP:
#
# http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# 当启动新节点时，通过这个ip列表进行节点发现，组建集群
# 默认节点列表：
# 127.0.0.1，表示ipv4的回环地址。
# [::1]，表示ipv6的回环地址
#
# 在es1.x中默认使用的是组播(multicast)协议，默认会自动发现同一网段的es节点组建集群，
# 在es2.x中默认使用的是单播(unicast)协议，想要组建集群的话就需要在这指定要发现的节点信息了。
# 注意：如果是发现其他服务器中的es服务，可以不指定端口[默认9300]，如果是发现同一个服务器中的es服务，就需要指定端口了。
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.zen.ping.unicast.hosts: ["host1", "host2"]
#
# 通过配置这个参数来防止集群脑裂现象 (集群总节点数量/2)+1
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
#discovery.zen.minimum_master_nodes: 3
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
# 一个集群中的N个节点启动后,才允许进行数据恢复处理，默认是1
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
# 在一台服务器上禁止启动多个es服务
#
# 设置是否可以通过正则或者_all删除或者关闭索引库，默认true表示必须需要显式指定索引库名称
# 生产环境建议设置为true，删除索引库的时候必须显式指定，否则可能会误删索引库中的索引库。
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true
2、 ElasticSearch集群搭建
ElasticSearch5.5要求JDK版本在1.8以上。
配置集群之前 先把要加群集群的节点的里的data目录下的Node目录 删除，否则集群建立会失败。
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