134 lines
2.6 KiB
Markdown
134 lines
2.6 KiB
Markdown
---
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title: ElasticSearch
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description: 安装以及使用文档
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published: true
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date: 2021-10-24T07:16:30.039Z
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tags: elk
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editor: markdown
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dateCreated: 2021-10-23T09:14:15.263Z
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---
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> 版本:7.15.1,内存至少4G,7之前的版本需要安装jdk,7之后用自带的jdk11
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# 部署
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## 单机部署
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CentOS
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1. 创建用户组以及用户:elasticsearch不允许root用户启动
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```bash
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$ addgroup esg
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$ adduser es -g esg
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$ passwd es
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```
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2. 修改elasticsearch文件夹及下所有文件的权限
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```bash
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$ chown -R es:esg elasticsearch-7.15.1
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```
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3. 切换用户
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```bash
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$ su es
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```
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4. 修改配置文件(如果不对外开放,不需要配置)
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```bash
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vim elasticsearch-7.15.1/config/elasticsearch.yml
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```
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修改内容
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```yml
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# 默认为localhost
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network.host: 192.168.0.156
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# 默认为9200
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http.port: 9200
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# ["127.0.0.1", "[::1]"]
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discovery.seed_hosts: ["192.168.0.156"]
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```
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5. 启动
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```bash
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# 前台启动
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$ ./bin/elasticsearch
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# 帮助
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$ ./bin/elasticsearch -h
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# 后台启动
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$ ./bin/elasticsearch -d
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# 退出
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$ ./bin/elasticsearch -q
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# 查看版本
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$ ./bin/elasticsearch -V
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```
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6. 查看结果
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```bash
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curl http://127.0.0.1:9200
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或
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curl http://192.168.0.156:9200
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```
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> 报错:max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
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{.is-warning}
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原因:原因是进程不够用了
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编辑 /etc/security/limits.conf,追加以下内容;
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```conf
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* soft nofile 65536
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* hard nofile 65536
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* soft nproc 65536
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* hard nproc 65536
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```
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> 1. nofile: 是每个进程可以打开的文件数的限制
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> 2. soft nofile表示软限制,hard nofile表示硬限制,软限制要小于等于硬限制。上面两行语句表示,root用户的软限制为1000,硬限制为1200,即表示root用户能打开的最大文件数量为1000,不管它开启多少个shell。
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> 3. nproc:是操作系统级别对每个用户创建的进程数的限制
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> 4.
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此文件修改后需要重新登录用户,才会生效
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登录后使用ulimit -S -n/ulimit -H -n查看
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> ulimit -n
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> 报错:max virtual memory areas vm.max_map_count [65530] is too low...
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{.is-warning}
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以上错误表示用户的内存使用权限不够
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解决办法
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```bash
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# 切换回root用户
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$ su root
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# 设置参数,这里的262144为错误提示的最小值,可根据实际情况调整,但不能超过最大内存
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sysctl -w vm.max_map_count=262144
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# 查看设置结果,有值代表设置成功
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sysctl -a|grep vm.max_map_count
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# 修改配置文件
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vim /etc/sysctl.conf
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```
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/etc/sysctl.conf文件最后一行添加
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```vim
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vm.max_map_count=262144
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```
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立即生效
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```bash
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sysctl -p
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```
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切换回es用户,启动服务
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