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前言

在Linux系统中安装elasticsearch。

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一、下载elasticsearch

下载地址：
https://www.elastic.co/cn/downloads/past-releases#elasticsearch

二、将tar包放到服务器

三、解压tar包

四、更改配置文件

vim /opt/elasticsearch/elasticsearch-8.15.1/config/elasticsearch.yml

更改为：

cluster.name: bztc-elasticsearch
node.name: bztc-es-node-1
path.data: /opt/elasticsearch/data
path.logs: /opt/elasticsearch/logs
network.host: 0.0.0.0
http.port: 9200
cluster.initial_master_nodes: ["bztc-es-node-1"]

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五、添加启动用户

此时启动es会报错，因为不能用root用户启动。
添加一个elasticserch用户：

#添加用户
sudo useradd elasticsearch
#设置用户elasticsearch的密码
sudo passwd elasticsearch
#将文件夹赋权给elasticsearch
sudo chown -R elasticsearch /opt/elasticsearch

六、用elasticserch用户启动

cd /opt/elasticsearch/elasticsearch-8.15.1/bin
./elasticsearch

6.1 报错

[2024-09-23T17:15:13,906][ERROR][o.e.b.Elasticsearch      ] [bztc-es-node-1] node validation exception
[2] bootstrap checks failed. You must address the points described in the following [2] lines before starting Elasticsearch. For more information see [https://www.elastic.co/guide/en/elasticsearch/reference/8.15/bootstrap-checks.html]
bootstrap check failure [1] of [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]; for more information see [https://www.elastic.co/guide/en/elasticsearch/reference/8.15/_maximum_map_count_check.html]
bootstrap check failure [2] of [2]: Transport SSL must be enabled if security is enabled. Please set [xpack.security.transport.ssl.enabled] to [true] or disable security by setting [xpack.security.enabled] to [false]; for more information see [https://www.elastic.co/guide/en/elasticsearch/reference/8.15/bootstrap-checks-xpack.html#bootstrap-checks-tls]

6.2 解决问题1

max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

sudo vim /etc/sysctl.conf
#在sysctl.conf末尾添加：vm.max_map_count=262144
#保存并退出文件，然后运行以下命令使更改生效
sudo sysctl -p

6.3 解决问题2

Transport SSL must be enabled if security is enabled. Please set [xpack.security.transport.ssl.enabled] to [true] or disable security by setting [xpack.security.enabled] to [false]

vim /opt/elasticsearch/elasticsearch-8.15.1/config/elasticsearch.yml
#在末尾添加：xpack.security.enabled: false
#保存文件

6.4 再次用elasticserch用户启动

cd /opt/elasticsearch/elasticsearch-8.15.1/bin
./elasticsearch

启动成功，没有报错后打开新的命令窗口执行：

curl localhost:9200

执行完出现以下内容：

{
  "name" : "bztc-es-node-1",
  "cluster_name" : "bztc-elasticsearch",
  "cluster_uuid" : "wecEbx33T5Sdv-UzTIpcNg",
  "version" : {
    "number" : "8.15.1",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "253e8544a65ad44581194068936f2a5d57c2c051",
    "build_date" : "2024-09-02T22:04:47.310170297Z",
    "build_snapshot" : false,
    "lucene_version" : "9.11.1",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}

6.5 windows浏览器打开

浏览器地址栏输入：http://10.211.55.120:9200
会出现：

如果服务器里curl localhost:9200能打印内容，而浏览器不行，则检查服务器防火墙是否关闭，或者配置文件里的network.host是否配置的0.0.0.0

七、设置开机自动启动

7.1 创建启动脚本

创建一个脚本文件。

sudo vim /opt/elasticsearch/start.sh

7.2 在脚本中添加以下内容

#!/bin/bash
cd /opt/elasticsearch/elasticsearch-8.15.1/bin && ./elasticsearch

7.3 赋予脚本执行权限

sudo chmod +x /opt/elasticsearch/start.sh

7.4 创建 Systemd 服务单元文件

sudo nano /etc/systemd/system/bztcES.service

在bztcES.service添加以下内容

[Unit]
Description=Elasticsearch Service
After=network.target

[Service]
Type=simple
User=elasticsearch
ExecStart=/opt/elasticsearch/start.sh
Restart=on-failure
RestartSec=60

[Install]
WantedBy=multi-user.target

7.5 重新加载 Systemd 配置

sudo systemctl daemon-reload

7.6 启动服务并使其在开机时自启

sudo systemctl start bztcES.service
sudo systemctl enable bztcES.service

7.7 检查服务状态

sudo systemctl status bztcES.service

总结

在Linux系统中安装elasticsearch。