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Linux 下安装 ElasticSearch

Linux 下安装 ElasticSearch

作者: tingshuo123 | 来源:发表于2018-11-25 12:40 被阅读18次

    前提

    ElasticSearch 同样需要 Java 环境,如果没有则需要先安装Java,关于Linux 下安装 Java 可以看这篇文章:Liunx 搭建 Java 开发环境

    安装

    下载安装包

    在 ElasticSearch 的下载页面 获取下载链接,然后通过 wget 命令下载

    # 切换目录
    cd /usr/local
    # 下载
    wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.1.tar.gz
    
    image.png

    解压

    tar -zxvf elasticsearch-6.5.1.tar.gz
    

    创建用户

    Elastic Serch 默认是不允许 root 用户启动的,所以我们要新建一个用户来启动 Elastic Serch。
    使用 adduser 命令添加用户,输入密码后一路按Enter键即可。

    adduser elsearch
    

    授权

    chown -R elsearch ./elasticsearch/
    

    修改配置文件(可选)

    默认情况下,Elastic 只允许本机访问,如果需要远程访问,可以修改 ElasticSearch 安装目录的 config/elasticsearch.yml 文件,去掉network.host 的注释,将它的值改成 0.0.0.0,然后重新启动 Elastic。

    elasticsearch.yml

    # ======================== Elasticsearch Configuration =========================
    #
    # NOTE: Elasticsearch comes with reasonable defaults for most settings.
    #       Before you set out to tweak and tune the configuration, make sure you
    #       understand what are you trying to accomplish and the consequences.
    #
    # The primary way of configuring a node is via this file. This template lists
    # the most important settings you may want to configure for a production cluster.
    #
    # Please consult the documentation for further information on configuration options:
    # https://www.elastic.co/guide/en/elasticsearch/reference/index.html
    #
    # ---------------------------------- Cluster -----------------------------------
    #
    # Use a descriptive name for your cluster:
    # 集群名字(可自定义)
    cluster.name: my-application
    #
    # ------------------------------------ Node ------------------------------------
    #
    # Use a descriptive name for the node:
    # 节点名字(可自定义)
    node.name: node-1
    #
    # Add custom attributes to the node:
    #
    #node.attr.rack: r1
    #
    # ----------------------------------- Paths ------------------------------------
    #
    # Path to directory where to store the data (separate multiple locations by comma):
    #
    #path.data: /path/to/data
    #
    # Path to log files:
    #
    #path.logs: /path/to/logs
    #
    # ----------------------------------- Memory -----------------------------------
    #
    # Lock the memory on startup:
    #
    #bootstrap.memory_lock: true
    #
    # Make sure that the heap size is set to about half the memory available
    # on the system and that the owner of the process is allowed to use this
    # limit.
    #
    # Elasticsearch performs poorly when the system is swapping the memory.
    #
    # ---------------------------------- Network -----------------------------------
    #
    # Set the bind address to a specific IP (IPv4 or IPv6):
    # 开启远程访问(所有主机都可以访问,不建议生产环境使用)
    network.host: 0.0.0.0
    #
    # Set a custom port for HTTP:
    # 端口
    http.port: 9200
    #
    # For more information, consult the network module documentation.
    #
    # --------------------------------- Discovery ----------------------------------
    #
    # Pass an initial list of hosts to perform discovery when new node is started:
    # The default list of hosts is ["127.0.0.1", "[::1]"]
    #
    #discovery.zen.ping.unicast.hosts: ["host1", "host2"]
    #
    # Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
    #
    #discovery.zen.minimum_master_nodes: 
    #
    # For more information, consult the zen discovery module documentation.
    #
    # ---------------------------------- Gateway -----------------------------------
    #
    # Block initial recovery after a full cluster restart until N nodes are started:
    #
    #gateway.recover_after_nodes: 3
    #
    # For more information, consult the gateway module documentation.
    #
    # ---------------------------------- Various -----------------------------------
    #
    # Require explicit names when deleting indices:
    #
    #action.destructive_requires_name: true
    
    
    # 开启使用 Elasticsearch REST 请求来直接查询 
    http.cors.enabled: true
    # 如果 http.cors.enabled 的值为 true,那么该属性会指定允许 REST 请求来自何处。
    http.cors.allow-origin: "*"
    

    启动 ElasticSearch

    # 进入安装目录
    cd ./elasticsearch
    # 切换用户
    su elsearch
    # 启动
    ./bin/elasticsearch
    

    如果这时报错"max virtual memory areas vm.maxmapcount [65530] is too low",要运行下面的命令。

    sudo sysctl -w vm.max_map_count=262144
    

    如果一切正常,Elastic 就会在默认的 9200 端口运行。这时,打开另一个命令行窗口,请求该端口,会得到 ElasticSearch 集群的信息。

    $ curl localhost:9200
    {
      "name" : "node-1",
      "cluster_name" : "my-application",
      "cluster_uuid" : "H4DwAEd2QIqaRtYFtx98TQ",
      "version" : {
        "number" : "6.5.1",
        "build_flavor" : "default",
        "build_type" : "tar",
        "build_hash" : "8c58350",
        "build_date" : "2018-11-16T02:22:42.182257Z",
        "build_snapshot" : false,
        "lucene_version" : "7.5.0",
        "minimum_wire_compatibility_version" : "5.6.0",
        "minimum_index_compatibility_version" : "5.0.0"
      },
      "tagline" : "You Know, for Search"
    }
    

    出现上面的信息说明 ElasticSearch 已经启动成功, 要退出可按 Enter + C
    如果想后台运行可以使用 ./elasticesrarch -d 命令,这样 ElasticSearch 就会以守护进程运行。

    参考资料
    ElasticSearch 权威指南
    Elasticsearch 服务配置属性

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