• 周三. 5 月 22nd, 2024

    CentOS7安装ElasticSearch7

    root

    7 月 9, 2020 #elastic, #elasticsearch, #es
    1. 下载es
      https://www.elastic.co/cn/downloads/elasticsearch
    2. CentOS创建es用户
    useradd es  //添加用户
    passwd es   //设置密码

    3. 安装jdk(如果没有装) ,JDK需要11版本以上
    CentOS安装jdk14

    4. 解压缩下载好的es包

    tar -zxvf elasticsearch-7.8.0-linux-x86_64.tar.gz

    5. 将解压后的目录移动到/usr/local/下

    mv elasticsearch-7.8.0 /usr/local/elasticsearch

    6. 修改/usr/local/elasticsearch/config/elasticsearch.yml配置文件,

    node.name: node-1 //指定当前节点名称
    network.host: 0.0.0.0     //其他服务器可通过IP访问
    cluster.initial_master_nodes: ["node-1"]  //指定主节点名称
    

    7. 启动ES

    查看/usr/local/elasticsearch目录的权限。 这里需要改所属用户和组

    chown -R es.es /usr/local/elasticsearch

    如果当前你在root用户下,请切换到es用户,否则es会提示你不能用root启动

    su es

    8. 后台启动es

    cd /usr/local/elasticsearch/
    ./bin/elasticsearch -d

    9. 查看启动日志

    [es@VM_0_3_centos elasticsearch]$ tail -f logs/elasticsearch.log 
    [2020-07-09T14:21:06,717][INFO ][o.e.x.m.p.NativeController] [VM_0_3_centos] Native controller process has stopped - no new native processes can be started
    [2020-07-09T14:21:06,745][INFO ][o.e.n.Node               ] [VM_0_3_centos] stopping ...
    [2020-07-09T14:21:06,762][INFO ][o.e.x.w.WatcherService   ] [VM_0_3_centos] stopping watch service, reason [shutdown initiated]
    [2020-07-09T14:21:06,765][INFO ][o.e.x.w.WatcherLifeCycleService] [VM_0_3_centos] watcher has stopped and shutdown
    [2020-07-09T14:21:06,864][INFO ][o.e.n.Node               ] [VM_0_3_centos] stopped
    [2020-07-09T14:21:06,866][INFO ][o.e.n.Node               ] [VM_0_3_centos] closing ...
    1] bootstrap checks failed
    [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
    ERROR: [1] bootstrap checks failed
    [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
    ERROR: Elasticsearch did not exit normally - check the logs at /usr/local/elasticsearch/logs/elasticsearch.log
    

    可以看到有ERROR 大概意思是需要提高vm.max_map_count的值,切回root

    [root@VM_0_3_centos elasticsearch]# sysctl -w vm.max_map_count=262144   //设置
    vm.max_map_count = 262144
    [root@VM_0_3_centos elasticsearch]# sysctl -a | grep  vm.max_map_count   //查看生效没
    sysctl: reading key "net.ipv6.conf.all.stable_secret"
    sysctl: reading key "net.ipv6.conf.default.stable_secret"
    sysctl: reading key "net.ipv6.conf.eth0.stable_secret"
    sysctl: reading key "net.ipv6.conf.lo.stable_secret"
    vm.max_map_count = 262144
    
    //设置永久生效
    vim /etc/sysctl.conf
    在文件尾加入
    vm.max_map_count = 262144

    10. 如果日志中看不出错误,即可验证

    [es@VM_0_3_centos elasticsearch]$ curl http://localhost:9200
    {
      "name" : "VM_0_3_centos",
      "cluster_name" : "elasticsearch",
      "cluster_uuid" : "2SsGoLt1RA2upOQ-sO8d5Q",
      "version" : {
        "number" : "7.8.0",
        "build_flavor" : "default",
        "build_type" : "tar",
        "build_hash" : "757314695644ea9a1dc2fecd26d1a43856725e65",
        "build_date" : "2020-06-14T19:35:50.234439Z",
        "build_snapshot" : false,
        "lucene_version" : "8.5.1",
        "minimum_wire_compatibility_version" : "6.8.0",
        "minimum_index_compatibility_version" : "6.0.0-beta1"
      },
      "tagline" : "You Know, for Search"
    }

    常见问题

    max number of threads [3818] for user [es] is too low, increase to at least [4096]
    最大线程个数太低。修改配置文件etc/security/limits.conf,增加配置
    * soft nproc 4096
    * hard nproc 4096

    注意这里的*号要带上,不可以删除

    root

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