ElasticSearch安装与配置

ElasticSearch安装与配置

centos 7 安装 ElasticSearch

安装elasticsearch之前 先要安装java jdk 8

这里提供下载地址：链接: https://pan.baidu.com/s/1ZIJc0JWKMyLl4Iivh-YlBw 密码: gr08

# 进入opt目录
cd /opt/
# 创建 soft文件夹 用来存储所有的软件  如果你有自己的目录，可以不创建这个目录
mkdir soft
cd soft
# 执行下载 ElasticSearch 这里使用目前最新的 7.10.1 如果没有wget命令 执行 yum install wget 进行安装
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.10.1-linux-x86_64.tar.gz
# 解压文件
tar -zxvf elasticsearch-7.10.1-linux-x86_64.tar.gz 
# 修改文件夹名称和移动目录
mv elasticsearch-7.10.1 /opt/elasticsearch
# 进入elasticsearch目录
cd /opt/elasticsearch

# 默认为了安全，不要使用root进行启动，这里创建一个 elasticsearch 用户和组
# 添加 elasticsearch 组
groupadd elasticsearch
# 添加 elasticsearch 用户 并添加到elasticsearch组中 -g 后表示组 
useradd elasticsearch -g elasticsearch 
# 修改文件夹拥有者 表示把elasticsearch文件夹 给elasticsearch用户和elasticsearch组
# 修改这个组之前 先退到elasticsearch的目标文件夹上一级
chown -R elasticsearch:elasticsearch elasticsearch

# 修改elasticsearch配置文件
# 进入elasticsearch 的config目录
cd elasticsearch/config/
# 编辑配置文件 参考下面配置文件
vi elasticsearch.yml 

## 启动
# 进入 elasticsearch/bin目录
cd bin/
# 使用elasticsearch用户进行启动
sudo -u elasticsearch ./elasticsearch -d
# 查询是否启动成功
ps -ef|grep elasticsearch
# 查看启动日志
tail -f /opt/elasticsearch/logs/yqzl-service.log 
# 验证是否成功
curl http://localhost:9200
#出现这个表示成功
:`
{
  "name" : "yqzl-node-1",
  "cluster_name" : "yqzl-service",
  "cluster_uuid" : "3wrpP4wwTFCBHdCboBqQfQ",
  "version" : {
    "number" : "7.10.1",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "1c34507e66d7db1211f66f3513706fdf548736aa",
    "build_date" : "2020-12-05T01:00:33.671820Z",
    "build_snapshot" : false,
    "lucene_version" : "8.7.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}
`

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: 集群名称
#
cluster.name: yqzl-service
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node: 节点名称
#
node.name: yqzl-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: /path/to/data
#
# Path to log files:
#
#path.logs: /path/to/logs
#
# ----------------------------------- 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): 运行访问的ip 0.0.0.0 表示都可以访问
#
network.host: 0.0.0.0 
#
# 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: 初始化主节点
#
cluster.initial_master_nodes: ["yqzl-node-1"]
#
# 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

安装遇到问题

elasticsearch启动时遇到的错误
elasticsearch用户拥有的内存权限太小，至少需要262144；

解决方法：
切换到root用户
执行命令：
sysctl -w vm.max_map_count=262144
查看结果：
sysctl -a|grep vm.max_map_count
显示：
vm.max_map_count = 262144
上述方法修改之后，如果重启虚拟机将失效，所以：
解决办法：
在 /etc/sysctl.conf文件最后添加一行
vm.max_map_count=262144
即可永久修改

使用ElasticSearch-head的时候，如果是在不同的服务器上，出现跨越的问题


//编辑配置文件
# vi elasticsearch/elasticsearch.yml

//增加下面两项
http.cors.enabled: true
http.cors.allow-origin: “*”

重启ElasticSearch就OK 了

其它资料

https://github.com/medcl/elasticsearch-analysis-ik/releases

https://github.com/medcl/elasticsearch-analysis-pinyin

https://elastic-search-in-action.medcl.com/

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