• Elasticsearch5.5 安装与配置


     
     
    一、Elastic基本功能
    Elasticsearch 是一个实时分布式搜索和分析引擎,一般用于全文搜索、结构化搜索,分析或者三者混用。
    它的底层是基于Apache Lucene(TM)的开源搜索引擎,但是lucene只是一个库,需要java开发然后集成到应用。
     
    Elasticsearch的特性描述:
    分布式实时文件存储,每个字段都能被索引并且可以被搜索
    分布式的实时分析搜索引擎
    可以扩展到上百台服务器,处理PB级结构化或者非结构化数据
     
    二、Elastic安装准备
      系统准备:
      CentOS 7.2
      jdk8
      elasticsearch 5.5
     
      1.首先需要java环境,需要安装jdk8,下载对应的tar包
     

    [root@master local]# ls

    bin jdk-8u152-linux-x64.tar.gz lib share etc lib64 mysql src games libexec qcloud include
    [root@master local]# pwd
    /usr/local
    [root@master local]# tar zxvf jdk-8u152-linux-x64.tar.gz
    #解压完成后,配置JAVA_HOME的环境变量
    [root@master ~]# vim /etc/profile
    #我一般是习惯放在文件最后
    #===============JAVA_HOME======================
    #这些环境变量配置的就是刚刚tar包解压之后的目录下
    export JAVA_HOME=/usr/local/jdk1.8.0_152
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    export PATH=$PATH:$JAVA_HOME/bin
    "/etc/profile" 83L, 1972C written
     
    [root@master ~]# source /etc/profile
    #查看一下版本是否正确
    [root@master ~]# java -version
    java version "1.8.0_152"
    Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
    Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)
    =================================================
    到目前为止,jdk8安装完毕
     
      2.安装elastic 下载解压即可
    --2018-03-27 11:29:36-- https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.5.1.zip
    Resolving artifacts.elastic.co (artifacts.elastic.co)... 184.73.245.233, 184.73.156.41, 54.235.82.130, ...
    Connecting to artifacts.elastic.co (artifacts.elastic.co)|184.73.245.233|:443... connected.
    HTTP request sent, awaiting response... 200 OK
    Length: 33511694 (32M) [application/zip]
    Saving to: ‘elasticsearch-5.5.1.zip’
     
    100%[===============================================================================>] 33,511,694 2.14MB/s in 36s
     
    2018-03-27 11:30:15 (900 KB/s) - ‘elasticsearch-5.5.1.zip’ saved [33511694/33511694]
     
    [root@master ~]# ls
    all.sql anaconda-ks.cfg elasticsearch-5.5.1.zip MHA-Manager.qcow2 zhou
    [root@master ~]# mv elasticsearch-5.5.1.zip /usr/local/
    [root@master ~]# cd /usr/local/
    [root@master local]# ls | egrep ela
    elasticsearch-5.5.1.zip
    [root@master local]# unzip elasticsearch-5.5.1.zip
    [root@master local]# cd elasticsearch-5.5.1/
     
    #=======================================================
    #启动过程中出现的错误:
    1》errno12 虚拟机内存不足
    [root@master elasticsearch-5.5.1]# ./bin/elasticsearch
    Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 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 2060255232 bytes for committing reserved memory.
    # An error report file with more information is saved as:
    # /usr/local/elasticsearch-5.5.1/hs_err_pid21903.log
    [root@master elasticsearch-5.5.1]# sysctl -w vm.max_map_count=262144
    vm.max_map_count = 262144
    #解决办法:
    由于默认配置是2G内存,虚拟机内存不够,可以更改为1G
    [root@master elasticsearch-5.5.1]# cd config/
    [root@master config]# ls
    elasticsearch.yml jvm.options log4j2.properties
    [root@master config]# pwd
    /usr/local/elasticsearch-5.5.1/config
    可以先free -m查看一下剩余的内存,再设置elastic的内存值
    [root@master config]# vim jvm.options
    -Xms1g
    -Xmx1g
    "jvm.options" 111L, 3064C
     
    2》不能用root运行elastic java.lang.RuntimeException: can not run elasticsearch as root
    解决方案:新建一个用户elauser,并且将elasticsearch的目录属性全部更改成elauser
    (如若目录夹属性未更改,有可能会出现如下错误)
    #############################################
    3》elasticsearch解压后的目录夹属性需要一起更改
    main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register")
    解决方案:
    [root@ELK local]# chown -R elauser:elauser ./elasticsearch-5.5.1
    [elauser@ELK local]$ ll | egrep elasticsearch-5.5.1
    drwxr-xr-x   7 elauser elauser      4096 Apr 10 15:20 elasticsearch-5.5.1
    -rw-r--r--   1 root    root     33511694 Jul 25  2017 elasticsearch-5.5.1.zip
    ###############################################
     
    切换到elauser,将java环境变量写在~/.bash_profile,如下所示(或者直接在最开始配置环境变量的时候,写在/etc/profile 这样所有的用户都能使用了)
    [elauser@master bin]$ vim ~/.bash_profile
    #===============JAVA_HOME======================
    export JAVA_HOME=/usr/local/jdk1.8.0_152
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    #export PATH=$PATH:$JAVA_HOME/bin
    #================================================
    PATH=$PATH:$HOME/.local/bin:$HOME/bin:$JAVA_HOME/bin
    export PATH
    "~/.bash_profile" 17L, 447C written
    新开一个窗口
    [elauser@master root]$ java -version
    java version "1.8.0_152"
    Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
    Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)
    [elauser@master root]$ cd /usr/local/elasticsearch-5.5.1/bin/
    [elauser@master bin]$ ./elasticsearch
    [2018-03-27T14:04:55,441][INFO ][o.e.n.Node ] [] initializing ...
    [2018-03-27T14:04:55,639][INFO ][o.e.e.NodeEnvironment ] [BJ7MQFi] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [38.7gb], net total_space [49gb], spins? [unknown], types [rootfs]
     
    #====================================================================
    以上错误是参考该网址:https://blog.csdn.net/qq_21387171/article/details/53577115
    似乎启动成功了。
     
    #打开另外一个终端,测试一下
    [root@master local]# curl 'http://localhost:9200/?pretty';
    {
    "name" : "BJ7MQFi",
    "cluster_name" : "elasticsearch",
    "cluster_uuid" : "p6zkUDhtR26SDfiCKCu5Zg",
    "version" : {
    "number" : "5.5.1",
    "build_hash" : "19c13d0",
    "build_date" : "2017-07-18T20:44:24.823Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.0"
    },
    "tagline" : "You Know, for Search"
    }
     
    #默认情况下elastic只能本地访问,如需远程访问,则需要修改其配置文件elasticsearch.yml
    [elauser@master config]$ pwd
    /usr/local/elasticsearch-5.5.1/config
    [elauser@master config]$ ls
    elasticsearch.yml jvm.options log4j2.properties scripts
    [elauser@master config]$ vim elasticsearch.yml
    [elauser@master config]$ egrep 'network' elasticsearch.yml
    #network.host: 192.168.0.1
    network.host: 0.0.0.0
    # For more information, consult the network module documentation.
     
    #关闭elastic:
    1.可以直接在启动页面Ctrl-C  
    2.调用shutdown API来关闭 
    curl -XPOST 'http://localhost:9200/_shutdown' 然而执行失败了,发现shutdown这个api被去掉了。
    3.简单粗暴的话,不如杀进程
    ps -ef | grep elastic;然后找到进程号,kill -9 进程号
    4.网上有介绍head插件,点击动作关停 即可
     
    3.配置elasticsearch
    ######################## 去掉不必要的注释 ###############################################
    [elauser@ELK config]$ pwd
    /usr/local/elasticsearch-5.5.1/config
    [elauser@ELK config]$ cat elasticsearch.yml
    # ======================== Elasticsearch Configuration =========================
    # ---------------------------------- Cluster -----------------------------------
    # Use a descriptive name for your cluster: 给集群定义一个name
    cluster.name: demon
    #
    # ------------------------------------ Node ------------------------------------
    # Use a descriptive name for the node: 给节点定义一个name
    #node.name: node-1
    node.name: elk-1
    # ----------------------------------- Paths ------------------------------------
    # Path to directory where to store the data (separate multiple locations by comma): 数据目录夹
    #path.data: /path/to/data
    path.data: /usr/local/elasticsearch-5.5.1/data
    #
    # Path to log files: 日志目录夹
    path.logs: /usr/local/elasticsearch-5.5.1/logs
    #
    # ----------------------------------- Memory -----------------------------------
    # Lock the memory on startup: 开启时锁定内存
    bootstrap.memory_lock: true
    # ---------------------------------- Network -----------------------------------
    # Set the bind address to a specific IP (IPv4 or IPv6): 绑定ip
    network.host: 0.0.0.0
    # Set a custom port for HTTP: 设定端口
    http.port: 9200
    #================= add ===================  这里切记注意冒号后面有空格
    http.cors.enabled: true
    http.cors.allow-origin: "*"
    #=========================================
    ##################################################################################
     
    出现报错[ERROR][o.e.b.Bootstrap ] [elk-1] node validation exception
    [1] bootstrap checks failed
    [1]: memory locking requested for elasticsearch process but memory is not locked
     
    #查一下日志文件
    [root@ELK logs]# pwd
    /usr/local/elasticsearch-5.5.1/logs
    [root@ELK logs]# more demon.log
     
    #解决办法:
    [root@ELK logs]# egrep 'unlimit' /etc/security/limits.conf
    * soft memlock unlimited
    * hard memlock unlimited
    [root@ELK logs]# ulimit -l unlimited
    #然后还需要新开一个窗口才会读取到这个配置文件
     
    #然后看一下9200端口是否启动了,ok就表示启动成功了
    [root@ELK logs]# netstat -tplan | grep 9200
    tcp 0 0 0.0.0.0:9200 0.0.0.0:* LISTEN 10881/java
     
    #浏览器访问也可以测试一下
    [root@ELK ~]# curl http://127.0.0.1:9200
    {
    "name" : "elk-1",
    "cluster_name" : "demon",
    "cluster_uuid" : "OCxZx2K5Q_C7u0jPxWvQvw",
    "version" : {
    "number" : "5.5.1",
    "build_hash" : "19c13d0",
    "build_date" : "2017-07-18T20:44:24.823Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.0"
    },
    "tagline" : "You Know, for Search"
    }
     
    4.与elasticsearch进行交互
    #利用API来查看一下状态
    [root@ELK ~]# curl -i -XGET 'localhost:9200/_count?pretty'
    HTTP/1.1 200 OK
    content-type: application/json; charset=UTF-8
    content-length: 95
    {
    "count" : 0,
    "_shards" : {
    "total" : 0,
    "successful" : 0,
    "failed" : 0
    }
    }
     
    5.安装插件
    #安装elasticsearch-head插件
    [root@ELK ~]# yum install -y npm
    [root@ELK ~]# yum install -y git
    [root@ELK ~]# git clone git://github.com/mobz/elasticsearch-head.git
    Cloning into 'elasticsearch-head'...
    remote: Counting objects: 4224, done.
    remote: Total 4224 (delta 0), reused 0 (delta 0), pack-reused 4224
    Receiving objects: 100% (4224/4224), 2.16 MiB | 88.00 KiB/s, done.
    Resolving deltas: 100% (2329/2329), done.
    #这个如若服务器的gpgcheck选项没关,是一定要执行的。目的是导入elasticsearch官网的公钥,install package的时候是需要密钥检测的
    [root@ELK elasticsearch-head]# rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
    [elauser@ELK local]$ ll | egrep ela
    drwxr-xr-x 9 elauser elauser 4096 Apr 10 15:39 elasticsearch-5.5.1
    -rw-r--r-- 1 root root 33511694 Jul 25 2017 elasticsearch-5.5.1.zip
    drwxr-xr-x 7 elauser elauser 4096 Apr 11 11:55 elasticsearch-head
    [elauser@ELK local]$ cd elasticsearch-head/
    [elauser@ELK elasticsearch-head]$ ls
    Dockerfile Gruntfile.js LICENCE proxy src
    Dockerfile-alpine grunt_fileSets.js package.json README.textile test
    elasticsearch-head.sublime-project index.html plugin-descriptor.properties _site
    [elauser@ELK elasticsearch-head]$ pwd
    /usr/local/elasticsearch-head
     
    [elauser@ELK elasticsearch-head]$ npm install
     
    #====================================
    #出现报错1:
    [elauser@ELK elasticsearch-head]$ npm install
    npm: relocation error: npm: symbol SSL_set_cert_cb, version libssl.so.10 not defined in file libssl.so.10 with link time reference
    #解决方案:
    [root@ELK ~]# yum update openssl -y
     
    #出现报错2:
    [elauser@ELK elasticsearch-head]$ npm install
    > phantomjs-prebuilt@2.1.16 install /usr/local/elasticsearch-head/node_modules/phantomjs-prebuilt
    > node install.js
    PhantomJS not found on PATH
    Saving to /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
    Receiving...
      [==--------------------------------------] 5%
    Error making request.
    Error: read ECONNRESET
        at exports._errnoException (util.js:1020:11)
        at TLSWrap.onread (net.js:568:26)
    #解决方案:
    [root@ELK elasticsearch-head]# npm config set registry=http://registry.npmjs.org
    #==========================================
     
    启动插件之前,还需要修改一下配置文件(如果那个add部分你之前没添加的话,这里就要加一下)
    改完注意重启elasticsearch(如若重启欧报错,记得检查一下配置文件是否正确)

    [elauser@ELK elasticsearch-head]$ npm run start

    > elasticsearch-head@0.0.0 start /usr/local/elasticsearch-head
    > grunt server
    Running "connect:server" (connect) task
    Waiting forever...
    Started connect web server on http://localhost:9100
     
    #检查一下端口,是否正常运行了
    [root@ELK ~]# netstat -tplan | grep 9200
    tcp 0 0 0.0.0.0:9200 0.0.0.0:* LISTEN 16538/java
    [root@ELK ~]# netstat -tplan | grep 9100
    tcp 0 0 0.0.0.0:9100 0.0.0.0:* LISTEN 16747/grunt
     
     
    #有两个配置文件可以参考一下,也可以不更改
    #这个不需要更改,但是这里改了之后忘记改回去了
    #浏览器访问一下
    看到如上集群健康就ok了。
     
     
    三、基本概念
      3.1 node、cluster
      elastic本质是一个分布式数据库。一个节点node就是运行一个elastic实例,集群cluster就是一组具有相同cluster.name的节点集合,协同工作,共享数据并且提供故障转移和扩展的功能。
      3.2 index
      elastic会对所有的字段进行索引,处理之后写入一个反向索引(Inverted Index)。查找数据的时候直接查找该索引。elastic数据管理的顶层单位就叫做index(索引),也称作数据库,每个index的名字必须小写。
    #查看当前节点的所有index
    [elauser@master bin]$ curl -X GET 'http://localhost:9200/_cat/indices?v';
    health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
    #新建index(向elastic发出一个put请求,新建一个weather的index)
    [elauser@master bin]$ curl -X PUT 'localhost:9200/weather'
    {"acknowledged":true,"shards_acknowledged":true}
    返回的JSON对象中,acknowledged字段表示操作成功
    #删除index(把上面新建的weather index 删除掉)
    [elauser@master bin]$ curl -X DELETE 'localhost:9200/weather'
    {"acknowledged":true}
     
    3.3 document
      index里面的单条记录被称为document。同一个index里面的document最好保持相同的schema,利于搜索。
      document使用JSON格式表示:
    {
        “user”:“张三”
        “title”:“工程师”
        “desc”:“数据库管理”
    }
    3.4 type
      type是一个逻辑分组,用来区分document。不同的type应该有相似的schema。性质完全不同的数据应该存成两个index。
    #查看当前每个index所包含的type
    [elauser@master bin]$ curl 'localhost:9200/_mapping?pretty=true'
    { }
     
    四、中文分词插件ik (这里选择ik)或者smartcn
     
      
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  • 原文地址:https://www.cnblogs.com/Kid-Zhou/p/9088772.html
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