简介

Elasticsearch 是一个基于 Lucene 的开源、分布式、RESTful 搜索引擎。

使用场景：海量数据的搜索

和 Lucene 的关系
Lucene：最先进，功能最强大的搜索库。如果直接基于Lucene开发，非常复杂，api复杂。
Elasticsearch：基于Lucene，封装了许多Lucene的底层功能，提供简单易用的restful api接口和许多语言的客户端，如Java的高级客户端(Java High Level Rest Client)和底层客户端(Java Low Level Rest Client)

和 mysql 的关系

下载

brew下载

brew install elastic/tap/elasticsearch-full 

brew services start elastic/tap/elasticsearch-full # if you don't want/need a background service you can just run /opt/homebrew/opt/elasticsearch-full/bin/elasticsearch 

官网下载

https://www.elastic.co/cn/downloads/elasticsearch
下载后解压，进入 bin 目录并执行 .elasticsearch

相关命令

elasticsearch --version # 启动 elasticsearch # 浏览器输入 localhost:9200 

9300 端口为 Elastic s earch 集群间组件的通信端口，
9200 端口为浏览器访问的 http协议 RESTful 端口。

安装目录&配置文件

安装目录

Data:    /opt/homebrew/var/lib/elasticsearch/elasticsearch_zhangyu/ Logs:    /opt/homebrew/var/log/elasticsearch/elasticsearch_zhangyu.log Plugins: /opt/homebrew/var/elasticsearch/plugins/ Config:  /opt/homebrew/etc/elasticsearch/ 

配置文件

[longshiyang@lsyPro elasticsearch ]$ vim elasticsearch.yml  #======================== 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: # cluster.name: elasticsearch_longshiyang # # ------------------------------------ Node ------------------------------------ # # Use a descriptive name for the node: # #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): # path.data: /usr/local/var/lib/elasticsearch/ # # Path to log files: #  path.logs: /usr/local/var/log/elasticsearch/ # # ----------------------------------- Memory ----------------------------------- # # Lock the memory on startup: # #bootstrap.memory_lock: true # # 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. # # Elasticsearch performs poorly when the system is swapping the memory. # # ---------------------------------- Network ----------------------------------- # # Set the bind address to a specific IP (IPv4 or IPv6): # #network.host: 192.168.0.1 # # Set a custom port for HTTP: # #http.port: 9200 # # For more information, consult the network module documentation. # # --------------------------------- Discovery ---------------------------------- # # Pass an initial list of hosts to perform discovery when this node is started: # The default list of hosts is ["127.0.0.1", "[::1]"] # #discovery.seed_hosts: ["host1", "host2"] # # Bootstrap the cluster using an initial set of master-eligible nodes: # #cluster.initial_master_nodes: ["node-1", "node-2"] # # For more information, consult the discovery and cluster formation module documentation. # # ---------------------------------- Gateway ----------------------------------- # # Block initial recovery after a full cluster restart until N nodes are started: # #gateway.recover_after_nodes: 3 # # For more information, consult the gateway module documentation. # # ---------------------------------- Various ----------------------------------- # # Require explicit names when deleting indices: # #action.destructive_requires_name: true 

操作

具体的 CRUD 操作后面更新