【ES】Elasticsearch学习

简单的安装

参考：https://blog.csdn.net/smilehappiness/article/details/118466378
官网：https://www.elastic.co/guide/en/elasticsearch/reference/current/targz.html

1. 下载：https://www.elastic.co/cn/downloads/elasticsearch
2. 解压：tar -zxvf elasticsearch-8.17.3-linux-x86_64.tar.gz
3. 设置ES_HOME并添加path路径ES_HOME/bin
4. 运行：elasticsearch
   有可能用了非es内部的jdk报错。
   配置jdk路径（避免ES调linux事先配置的jdk）

export JAVA_HOME=/data1/ztshao/programs/elasticsearch-8.17.3/jdk
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tool.jar

初次启动会初始化一个密码，存下来。

bash设置密码export ELASTIC_PASSWORD="your_password"

5. 查看运行情况的运行方式：elasticsearch -E xpack.security.enabled=false。注意要加后面的enabled=false。不然返回都是空的。

import requests
# 定义要访问的URL
url= "http://127.0.0.1:9200/"
try:
    response = requests.get(url)
    # 输出服务器返回的内容
    print("Response:")
    print(response.text)
except requests.exceptions.RequestException as e:
    # 如果请求失败，输出错误信息
    print("Error:", e)

输出内容：

Response:
<Response [200]>
{
  "name" : "crowley.nju.edu.cn",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "9fN7znHVToW9PmKqGh3ITg",
  "version" : {
    "number" : "8.17.3",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "a091390de485bd4b127884f7e565c0cad59b10d2",
    "build_date" : "2025-02-28T10:07:26.089129809Z",
    "build_snapshot" : false,
    "lucene_version" : "9.12.0",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}

输出这个内容说明安装成功了。

7. 远程看浏览器：我这里直接通过ssh转了9200和8000的接口

ssh -R 9200:localhost:9200 -N ztshao@114.212.85.127
ssh -R 8000:localhost:8000 -N ztshao@114.212.85.127

8. 远程访问，修改配置：config/elasticsearch.yml。添加配置network.host: 0.0.0.0允许远程访问
   报错参考：https://blog.csdn.net/Leon_Jinhai_Sun/article/details/126673674

配置密码在shell里：

export ELASTIC_PASSWORD="your_password"