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Centos7上安装 elasticsearch-6.2.2及相关插件

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elasticsearch是一个开源的搜索服务器,提供了一个分布式多用户能力的全文搜索引擎,下面是我的安装笔记

准备工作

java版本

jdk版本必须是1.8及1.8以上

[[email protected] ~]# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

创建es用户

elasticsearch6 不允许root用户安装和使用,需要另外创建用户

[[email protected] ~]# useradd es &&  echo "es123"  | passwd --stdin es

修改 /etc/security/limits.conf

[[email protected] ~]#  vim /etc/security/limits.conf
# 修改系统最大文件描述符限制
* soft nofile 262144 
* hard nofile 262144
# 修改系统锁内存限制
es soft memlock unlimited 
es hard memlock unlimited
# 更改用户可启用的最大线程数
*  hard    nproc   4096
*  soft    nproc   4096

修改 /etc/sysctl.conf

[[email protected] ~]#  vim /etc/sysctl.conf
vm.max_map_count = 262144
vm.swappiness = 1   # 禁用swapping

使修改生效

[[email protected] ~]#  sysctl -p

安装 elasticsearch-6.2.2

下载解压

[[email protected] ~]# cd /usr/local/src
[[email protected] src]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.2.tar.gz
[[email protected] src]#  tar xzvf elasticsearch-6.2.2.tar.gz
[[email protected] src]# mv elasticsearch-6.2.2 /opt

修改elasticsearch-6.2.2目录权限

将该目录下所有文件的属主与属组均改为es

[[email protected] src]# chown -R es:es /opt/elasticsearch-6.2.2/

创建数据目录与日志目录

注意:后续操作需要切换至es账户

[[email protected] src]# su - es
[[email protected] src]$ cd /opt/elasticsearch-6.2.2/
[[email protected] elasticsearch-6.2.2]$ mkdir -p elasticsearchdata/{data,log}

修改配置文件

[[email protected] elasticsearch-6.2.2]$ cd /opt/elasticsearch-6.2.2/conf
[[email protected] conf]$  vim elasticsearch.yml
# 需要修改 cluster.name,node.name,path.data等参数值
cluster.name: app_es    # 集群名字
node.name: node-1   # 节点名字
path.data: /opt/elasticsearch-6.2.2/elasticsearchdata/data # 指定数据存放路径
path.logs: /opt/elasticsearch-6.2.2/elasticsearchdata/log # 指定日志存放路径
bootstrap.memory_lock: false
network.host: 0.0.0.0 # Set the bind address to a specific IP
http.port: 9200 # 默认是9200,你也可以通过修改其值自定义端口
transport.tcp.port: 9300    # 默认是9300,可自定义
# 集群发现
#集群节点ip或者主机,在这里添加各节点ip
discovery.zen.ping.unicast.hosts: ["ip1:9300", "ip2:9300""ip3:9300"]
# 设置这个参数来保证集群中的节点可以知道其它N个有master资格的节点。默认为1,对于大的集群来说,可以设置大一点的值(2-4)
discovery.zen.minimum_master_nodes: 3

启动服务

[[email protected] elasticsearch-6.2.2]$ /opt/elasticsearch-6.2.2/bin/elasticsearch    #前台启动
[[email protected] elasticsearch-6.2.2]$ nohup /opt/elasticsearch-6.2.2/bin/elasticsearch &    #后台启动

测试服务是否启动成功

看到9200和9300端口就ok了,其中9300是es节点tcp通讯端口,9200是RESTful接口

[[email protected] ~]$ netstat -lntp | grep -E "9200|9300"
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:9200            0.0.0.0:*               LISTEN      1022/java
tcp        0      0 0.0.0.0:9300            0.0.0.0:*               LISTEN      1022/java

在浏览器输入 http://你的ip:9200,可看到如下内容

{
  "name" : "node-1",
  "cluster_name" : "app_es",
 "cluster_uuid" : "...", 
  "version" : {
    "number" : "6.2.2",
    "build_hash" : "10b1edd",
    "build_date" : "2018-02-16T19:01:30.685723Z",
    "build_snapshot" : false,
    "lucene_version" : "7.2.1",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}
证明启动成功

解决启动报错

错误一:Cannot allocate memory

Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000ca660000, 899284992, 0) failed; error='Cannot allocate memory' (errno=12)
There is insufficient memory for the Java Runtime Environment to continue.
Native memory allocation (mmap) failed to map 899284992 bytes for committing reserved memory.
An error report file with more information is saved as:
/opt/elasticsearch-6.2.2/hs_err_pid17955.log

由以上错误信息可知,分配给java的内存不足,elasticsearch6.2 默认分配 jvm 空间大小为1g,这个虚机的内存大小不足,需要修改 jvm 空间分配,我们可以将1g改成512m

[[email protected] ~]$ vim /opt/elasticsearch-6.2.2/config/jvm.options
-Xms1g  修改为 -Xms512m
-Xmx1g  修改为 -Xmx512m

错误二:文件描述符不足

ERROR: [3] bootstrap checks failed
[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
[2]: memory locking requested for elasticsearch process but memory is not locked
[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

如何你按我的教程顺序来就不会发生这个错误,请参照准备工作这一节,修改相应的内核参数

错误三:不能以root启动

不能以root身份来启动es服务,需要以相应的es来启动

插件下载

下载中文分词器 elasticsearch-analysis-ik 插件

[[email protected] ~]$ /opt/elasticsearch-6.2.2/bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.2.2/elasticsearch-analysis-ik-6.2.2.zip

下载 elasticsearch-head 插件

head插件是elasticsearch的客户端工具

# 下载必要组件
[[email protected] ~]# yum -y install nodejs npm git bzip2
[[email protected] ~]# cd /opt/
[[email protected] opt]# git clone https://github.com/mobz/elasticsearch-head.git
[[email protected] opt]# npm install -g grunt-cli
[[email protected] opt]# cd /opt/elasticsearch-head
[[email protected] /opt/elasticsearch-head]# npm install
# 修改Gruntfile.js
[[email protected] opt]# cd /opt/elasticsearch-head
[[email protected] /opt/elasticsearch-head]# vim Gruntfile.js
# 在appcss后添加server块
appcss: {
                                src: fileSets.srcCss,
                                dest: '_site/app.css'
                        },
                        server: {
                                options: {
                                        hostname: '*',          
                                        port: 9100,
                                        base: '.',      
                                        keepalive: true
                                }
                        }
                },
## 对外开放端口为9100,允许任何主机访问
# 修改elasticsearch-head默认连接地址
## 修改head/_site/app.js,修改head连接es的地址(修改localhost为本机的IP地址)
[[email protected] /opt/elasticsearch-head]#  cd _site
[[email protected] _site]# vim app.js
## 将localhost修改为es服务的IP地址
修改前:this.base_uri = this.config.base_uri || this.prefs.get("app-base_uri") || "http://localhost:9200";
修改后: this.base_uri = this.config.base_uri || this.prefs.get("app-base_uri") || "http://你的ip:9200";
# 启动head服务
[[email protected] _site]# cd /opt/elasticsearch-head/node_modules/grunt/bin/
[[email protected] bin]# nohup ./grunt server &
# 修改 elasticsearch-6.2.2 配置文件
[[email protected] opt]# su - es 
[[email protected] opt]$ vim /opt/elasticsearch-6.2.2/config/elasticsearch.yml
## 在配置文件最后添加下面两条
http.cors.enabled: true # 允许跨域访问,为了配合elasticsearch-head可视化ES界面
http.cors.allow-origin: "*" # 允许所有地址跨域访问
## 然后重启es服务

在浏览器输入:http://你的ip:9100,开始使用es服务吧

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