ElasticSearch ：rhel 安装 elasticSearch7.9.0

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

将安装包上传至服务器

解压命令：

tar -zvxf elasticsearch-7.9.0-linux-x86_64.tar.gz
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进入 config 目录，给文件赋权限：

chmod -R 777 elasticsearch.yml jvm.options log4j2.properties role_mapping.yml roles.yml users users_roles
chmod -R 755 jvm.options.d
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修改配置：

# 修改文件命令
vim elasticsearch.yml
# 修改内容
node.name: node-1
network.host: 192.168.1.201
http.port: 9200
cluster.initial_master_nodes: ["node-1"]
xpack.security.enabled: true
xpack.security.transport.ssl.enabled: true
# xpack.ml.enabled: false
xpack.license.self_generated.type: basic
http.cors.enabled: true
http.cors.allow-origin: "*"
http.cors.allow-methods: OPTIONS, HEAD, GET, POST, PUT, DELETE
http.cors.allow-headers: "X-Requested-With, Content-Type, Content-Length, X-User, Authorized"
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创建 elasticsearch.keystore 文件：

进入 bin 目录下执行命令，会在 config 目录下生成 elasticsearch.keystore 文件
./elasticsearch-keystore create
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进入 config 目录，给 elasticsearch.keystore 赋予权限
chmod -R 777 elasticsearch.keystore
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ES 不建议用 root 用户启动，给要启动 ES 的用户赋予 elasticsearch 目录权限：

chown -R 用户名 es安装路径
eg：chown -R dex /home/dex/elasticsearch-7.9.0/elasticsearch-7.9.0
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切换 dex 用户，启动 ES：

su dex
进入 es 的 bin 目录
./elasticsearch -d
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访问：192.168.1.201:9200，这时无法登录，因为开启了安全策略，但是没有设置密码。

设置密码：

切回 root 用户，进入 es 的 bin 目录，执行命令
./elasticsearch-setup-passwords interactive
出现提示，输入 y，回车继续，会依次出现下面的密码设置，输入密码：1357911
Enter password for [elastic]: 
Reenter password for [elastic]: 
Enter password for [kibana]: 
Reenter password for [kibana]: 
Enter password for [logstash_system]: 
Reenter password for [logstash_system]: 
Enter password for [beats_system]: 
Reenter password for [beats_system]: 
Changed password for user [kibana]
Changed password for user [logstash_system]
Changed password for user [beats_system]
Changed password for user [elastic]
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访问：192.168.1.201:9200，登录账号：elastic，密码：1357911

修改密码：

curl -H "Content-Type:application/json" -XPOST -u elastic 'http://ip:port/_xpack/security/user/elastic/_password' -d '{ "password" : "新密码" }'

eg：curl -H "Content-Type:application/json" -XPOST -u elastic 'http://192.168.1.201:9200/_xpack/security/user/elastic/_password' -d '{ "password" : "dexadmin@123" }'
出现提示：输入旧密码 1357911
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访问：192.168.1.201:9200，提示重新登录，登录账号：elastic，密码：dexadmin@123

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                                                                                                                                                                                             -Czx.