Elasticsearch8.4.3单机版安装

elasticsearch下载地址：https://www.elastic.co/cn/downloads/past-releases#elasticsearch
因为elasticsearch是java开发的，所以依赖jdk，elasticsearch7.x及之前的版本使用jdk8，elasticsearch7.x之后的版本都自带jdk，无需安装。

1、安装elasticsearch

 rpm -i elasticsearch-8.4.3-x86_64.rpm 
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安装后打印日志如下

警告：elasticsearch-8.4.3-x86_64.rpm: 头V4 RSA/SHA512 Signature, 密钥 ID d88e42b4: NOKEY
Creating elasticsearch group... OK
Creating elasticsearch user... OK
--------------------------- Security autoconfiguration information ------------------------------

Authentication and authorization are enabled.
TLS for the transport and HTTP layers is enabled and configured.

The generated password for the elastic built-in superuser is : idyUB6RlAvsWDs=Mx98E

If this node should join an existing cluster, you can reconfigure this with
'/usr/share/elasticsearch/bin/elasticsearch-reconfigure-node --enrollment-token '
after creating an enrollment token on your existing cluster.

You can complete the following actions at any time:

Reset the password of the elastic built-in superuser with 
'/usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic'.

Generate an enrollment token for Kibana instances with 
 '/usr/share/elasticsearch/bin/elasticsearch-create-enrollment-token -s kibana'.

Generate an enrollment token for Elasticsearch nodes with 
'/usr/share/elasticsearch/bin/elasticsearch-create-enrollment-token -s node'.

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### NOT starting on installation, please execute the following statements to configure elasticsearch service to start automatically using systemd
 sudo systemctl daemon-reload
 sudo systemctl enable elasticsearch.service
### You can start elasticsearch service by executing
 sudo systemctl start elasticsearch.service
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为什么要把日志列出来往下看

2、启动elasticsearch

systemctl start elasticsearch.service  #启动elasticsearch
systemctl stop elasticsearch.service   #停止elasticsearch
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3、关闭防火墙，访问elasticsearch

https://192.168.236.129:9200/
需要登陆的账号密码，在哪？
回头看打印日志

The generated password for the elastic built-in superuser is : idyUB6RlAvsWDs=Mx98E
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密码就在最后，但是密码太长记不住，换个密码怎么处理？
看日志

/usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic   #由系统重置密码
/usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic -i #手工指定elastic的新密码
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再次登陆输入账号密码即可

elasticsearch安装文件路径

官方安装文档：https://www.elastic.co/guide/en/elasticsearch/reference/8.4/rpm.html#_use_the_ca_certificate_4