Linux Centos7.5 安装elasticsearch(单机/集群)

Love The Way You Lie 2023-07-12 11:55 3阅读 0赞

## **一：所需软件 ** ##

### ![202003081605409.png][] ###

**ps:**

**1.需要依赖jdk环境（可以参考：[Linux Centos7.5 安装配置Oracle jdk1.8][Linux Centos7.5 _Oracle jdk1.8]）。当前Linux是centos7.5版本；**

**2.如果是linux centos6.+可以参考：[Linux centos6.8 安装配置elasticsearch6.3.2 【单机】（一）][Linux centos6.8 _elasticsearch6.3.2]，[Linux centos6.8 安装配置elasticsearch6.3.2 【单机】（二）][Linux centos6.8 _elasticsearch6.3.2 1]**

## 二：安装elasticsearch-7.4.2 ##

#解压
    tar -zxvf elasticsearch-7.4.2-linux-x86_64.tar.gz
    
    #将文件夹移动到/usr/local目录下
    mv elasticsearch-7.4.2 /usr/local
    
    #进入到elasticsearch目录下
    cd elasticsearch-7.4.2/
    
    #创建data空文件夹（用于存放数据）
    mkdir data
    
    #进入config目录
    /cd usr/local/elasticsearch-7.4.2/config
    
    #编辑elasticsearch.yml（elasticsearch的核心配置文件）
    vim elasticsearch.yml
    注：如果没有vim命令，可以使用vi命令，或者安装vim

**编辑elasticsearch.yml:**

#集群名字
    cluster.name: lucifer-elasticsearch
    
    #节点
    node.name: node-1
    
    #存放数据路径
    path.data: /usr/local/elasticsearch-7.4.2/data
    
    #存放日志路径
    path.logs: /usr/local/elasticsearch-7.4.2/logs
    
    #设置network.host
    network.host: 0.0.0.0
    
    #与node.name一致
    cluster.initial_master_nodes: ["node-1"]

**编辑jvm.options：**

#编辑jvm.options
    vim jvm.options
    
    #原本1g修改为：
    -Xms256m
    -Xmx256m

***ps:**whoami*命令用于显示自身用户名称.**

### **问题1： **  ###

**can not run elasticsearch as root，也就是说不能使用root用户去启动elasticsearch，因为elasticsearch内置的安全性。**

![20200308153623479.png][]

**解决：**

#用于显示当前用户
    whoami
    
    #添加用户
    useradd esuser
    
    #授权esuser用户拥有elasticsearch-7.4.2目录的权限
    chown -R esuser /usr/local/elasticsearch-7.4.2

**截图1：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70][]

### 问题2： ###

**Cannot open file logs/gc.log due to Permission denied；由于权限被拒绝，无法打开文件日志/gc.log**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 1][]

**解决：**

#解决问题
    [esuser@localhost bin]$ su root
    Password:
    [root@localhost bin]# cd ..
    [root@localhost elasticsearch-7.4.2]# pwd
    /usr/local/elasticsearch-7.4.2
    [root@localhost elasticsearch-7.4.2]# chown -R esuser:esuser /usr/local/elasticsearch-7.4.2
    
    
    #再次使用esuser用户执行elasticsearch命令
    [root@localhost elasticsearch-7.4.2]# su esuser
    [esuser@localhost elasticsearch-7.4.2]$ cd bin
    [esuser@localhost bin]$ ./elasticsearch

**问题出现两个：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 2][]

### 问题3： ###

**max file descriptors \[4096\] for elasticsearch process is too low, increase to at least \[65535\]**

[esuser@localhost bin]$ su root
    Password:
    [root@localhost bin]# vim /etc/security/limits.conf

**解决：**

**ps:需要切换到root的用户，系统文件需要root用户权限才可以修改。**

#添加如下内容：
    * soft nofile 65536
    * hard nofile 65536
    * soft nproc 4096
    * hard nproc 4096

### 问题4： ###

**max virtual memory areas vm.max\_map\_count \[65530\] is too low, increase to at least \[262144\]**

**解决：**

#编辑sysctl.conf
    [root@localhost bin]# vim /etc/sysctl.conf
    [root@localhost bin]# sysctl -p
    vm.max_map_count = 262144
    [root@localhost bin]# su esuser
    [esuser@localhost bin]$ ./elasticsearch

**这次启动，正常。**

**访问浏览器[http://192.168.160.130:9200/][http_192.168.160.130_9200]，可以看到elasticsearch的相关配置信息。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 3][]

**ps: 也可以后台启动elasticsearch ，命令：./elasticsearch -d**

[esuser@localhost bin]$ ./elasticsearch -d
    future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/jdk1.8.0_11/jre] does not meet this requirement
    [esuser@localhost bin]$

**可以使用命令查看：jps**

![20200308161918554.png][]

**或者ps -ef | grep elasticsearch**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 4][]

## 三、安装es-header插件 ##

**方式一**：**使用谷歌商店提供的es-header插件（需要会科学上网）**

**附：[chrome 网上应用店][chrome]**

**插件名：ElasticSearch Head**

![20200308165357124.png][]

## ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 5][]四、安装ik分词器 ##

### 1.安装ik分词器 ###

[root@localhost opt]# unzip elasticsearch-analysis-ik-7.4.2.zip -d /usr/local/elasticsearch-7.4.2/plugins/ik
    [root@localhost opt]# cd /usr/local/elasticsearch-7.4.2/plugins/ik/
    [root@localhost ik]# ls
    commons-codec-1.9.jar                httpclient-4.5.2.jar
    commons-logging-1.2.jar              httpcore-4.4.4.jar
    config                               plugin-descriptor.properties
    elasticsearch-analysis-ik-7.4.2.jar  plugin-security.policy
    [root@localhost ik]# su esuser
    [esuser@localhost ik]$ jps
    58434 Jps
    39194 Elasticsearch
    [esuser@localhost ik]$ kill 39194
    [esuser@localhost ik]$ cd /usr/local/elasticsearch-7.4.2/bin
    [esuser@localhost bin]$ ./elasticsearch -d
    future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/jdk1.8.0_11/jre] does not meet this requirement
    [esuser@localhost bin]$ jps
    58507 Elasticsearch
    58526 Jps

**ps：安装完ik分词器后，需要重启elasticsearch。**

**测试：使用postman测试ik分词效果：**

**ps: ik\_max\_word** **会将文本做最细粒度的划分。**

**      ik\_smart 会将文本做最粗粒度的划分。**

### **效果1: ik\_max\_word:** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 6][]  
**分词效果： **

{
        "tokens": [
            {
                "token": "中华人民共和国",
                "start_offset": 0,
                "end_offset": 7,
                "type": "CN_WORD",
                "position": 0
            },
            {
                "token": "中华人民",
                "start_offset": 0,
                "end_offset": 4,
                "type": "CN_WORD",
                "position": 1
            },
            {
                "token": "中华",
                "start_offset": 0,
                "end_offset": 2,
                "type": "CN_WORD",
                "position": 2
            },
            {
                "token": "华人",
                "start_offset": 1,
                "end_offset": 3,
                "type": "CN_WORD",
                "position": 3
            },
            {
                "token": "人民共和国",
                "start_offset": 2,
                "end_offset": 7,
                "type": "CN_WORD",
                "position": 4
            },
            {
                "token": "人民",
                "start_offset": 2,
                "end_offset": 4,
                "type": "CN_WORD",
                "position": 5
            },
            {
                "token": "共和国",
                "start_offset": 4,
                "end_offset": 7,
                "type": "CN_WORD",
                "position": 6
            },
            {
                "token": "共和",
                "start_offset": 4,
                "end_offset": 6,
                "type": "CN_WORD",
                "position": 7
            },
            {
                "token": "国",
                "start_offset": 6,
                "end_offset": 7,
                "type": "CN_CHAR",
                "position": 8
            },
            {
                "token": "国歌",
                "start_offset": 7,
                "end_offset": 9,
                "type": "CN_WORD",
                "position": 9
            }
        ]
    }

**效果2: ik\_smart:**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 7][]

{
        "tokens": [
            {
                "token": "中华人民共和国",
                "start_offset": 0,
                "end_offset": 7,
                "type": "CN_WORD",
                "position": 0
            },
            {
                "token": "国歌",
                "start_offset": 7,
                "end_offset": 9,
                "type": "CN_WORD",
                "position": 1
            }
        ]
    }

### 2、自定义词库 ###

**附：**[elasticsearch-analysis-ik][]

**2.1**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 8][]

{
        "tokens": [
            {
                "token": "骚",
                "start_offset": 0,
                "end_offset": 1,
                "type": "CN_CHAR",
                "position": 0
            },
            {
                "token": "年在",
                "start_offset": 1,
                "end_offset": 3,
                "type": "CN_WORD",
                "position": 1
            },
            {
                "token": "干嘛",
                "start_offset": 3,
                "end_offset": 5,
                "type": "CN_WORD",
                "position": 2
            }
        ]
    }

** 2.2 编辑IKAnalyzer.cfg.xml**

[esuser@localhost ~]$ cd /usr/local/elasticsearch-7.4.2/plugins/ik/config
    [esuser@localhost config]$ ls
    extra_main.dic                  extra_stopword.dic  quantifier.dic
    extra_single_word.dic           IKAnalyzer.cfg.xml  stopword.dic
    extra_single_word_full.dic      main.dic            suffix.dic
    extra_single_word_low_freq.dic  preposition.dic     surname.dic
    [esuser@localhost config]$ su root
    Password:
    [root@localhost config]# vim IKAnalyzer.cfg.xml

**IKAnalyzer.cfg.xml:**

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
    <properties>
            <comment>IK Analyzer 扩展配置</comment>
            
            <entry key="ext_dict">custom.dic</entry>
             
            <entry key="ext_stopwords"></entry>
            
            
            
            
    </properties>

**ps:这里的custom.dic是自己的词库。**

[root@localhost config]# vim custom.dic
    [root@localhost config]# ls
    custom.dic                      extra_stopword.dic  stopword.dic
    extra_main.dic                  IKAnalyzer.cfg.xml  suffix.dic
    extra_single_word.dic           main.dic            surname.dic
    extra_single_word_full.dic      preposition.dic
    extra_single_word_low_freq.dic  quantifier.dic
    [root@localhost config]# cd ..
    [root@localhost ik]# cd /usr/local/elasticsearch-7.4.2/bin
    [root@localhost bin]# su root
    [root@localhost bin]# su esuser
    [esuser@localhost bin]$ jps
    58938 Jps
    58507 Elasticsearch
    [esuser@localhost bin]$ kill 58507
    [esuser@localhost bin]$ jps
    59034 Jps
    [esuser@localhost bin]$ ./elasticsearch -d
    future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/jdk1.8.0_11/jre] does not meet this requirement

**ps：custom.dic内容如下：**

![20200308181651314.png][]

**重启elasticsearch后：**

**再次测试，”骚年“两个字已经变成了一个词了。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 9][]

**以上部分是单机。**

**================================搭建集群====================================**

**以下部分就是改造为集群模式。**

## 五、搭建集群 ##

![20200308190118411.png][]

**ps:01-1，01-2为虚拟机01的克隆虚拟机。**

**ps:由于是克隆虚拟机，所以在每一台虚拟机中都删除cd /usr/local/elasticsearch-7.4.2/data的nodes文件夹中所有文件。**

**5.1 删除data文件夹下notes文件数据（三台虚拟机都需要删除）**

[root@localhost ~]# cd /usr/local/elasticsearch-7.4.2/data
    [root@localhost data]# ls
    nodes
    [root@localhost data]# rm -rf nodes/
    [root@localhost data]# ls
    [root@localhost data]#

**5.2 编辑elasticsearch.yml（三台虚拟机都需要配置）**

**192.168.160.130：**

[root@localhost config]# vim elasticsearch.yml
    [root@localhost config]# more elasticsearch.yml | grep ^[^#]
    cluster.name: lucifer-es-cluster
    node.name: node-1
    path.data: /usr/local/elasticsearch-7.4.2/data
    path.logs: /usr/local/elasticsearch-7.4.2/logs
    network.host: 0.0.0.0
    http.cors.enabled: true
    http.cors.allow-origin: "*"
    node.master: true
    node.data: true
    discovery.seed_hosts: ["192.168.160.130","192.168.160.133","192.168.160.134"]
    cluster.initial_master_nodes: ["node-1"]

** ps:** **more elasticsearch.yml | grep ^\[^\#\] ** 表示查看elasticsearch.yml中除去\#注释的配置

**192.168.160.133；192.168.160.134这两台虚拟机elasticsearch.yml大致相同，除了node.name。192.168.160.130==》node.name: node-1；192.168.160.133==》node.name: node-2；92.168.160.134==》node.name: node-3；**

**再次切换为esuser用户，启动elasticsearch；**

**ps:**

**如果遇到如下报错信息：****java.io.FileNotFoundException: /usr/local/elasticsearch-7.4.2/logs/lucifer-es-cluster\_index\_indexing\_slowlog.json (Permission denied)**

**解决：删除logs文件夹下所有文件**

[esuser@localhost elasticsearch-7.4.2]$ cd logs
    [esuser@localhost logs]$ pwd
    /usr/local/elasticsearch-7.4.2/logs
    [esuser@localhost logs]$ rm -rf *

**三台虚拟机均启动成功后，访问浏览器：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 10][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 11][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 12][]

**用Elasticsearch Head查看es集群信息：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 13][]

[202003081605409.png]: https://img-blog.csdnimg.cn/202003081605409.png
[Linux Centos7.5 _Oracle jdk1.8]: https://blog.csdn.net/qq_37495786/article/details/81944895
[Linux centos6.8 _elasticsearch6.3.2]: https://blog.csdn.net/qq_37495786/article/details/81946565
[Linux centos6.8 _elasticsearch6.3.2 1]: https://blog.csdn.net/qq_37495786/article/details/81947031
[20200308153623479.png]: https://img-blog.csdnimg.cn/20200308153623479.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200308152409391.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2,size_16,color_FFFFFF,t_70
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[http_192.168.160.130_9200]: http://192.168.160.130:9200/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200308161257759.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2,size_16,color_FFFFFF,t_70
[20200308161918554.png]: https://img-blog.csdnimg.cn/20200308161918554.png
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[chrome]: https://chrome.google.com/webstore/category/extensions?hl=zh-CN
[20200308165357124.png]: https://img-blog.csdnimg.cn/20200308165357124.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200308165554922.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NDk1Nzg2,size_16,color_FFFFFF,t_70
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[elasticsearch-analysis-ik]: https://github.com/medcl/elasticsearch-analysis-ik
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