[大数据]centos7安装elasticsearch

centos7安装elasticsearch

• 去官网https://www.elastic.co/cn/downloads/past-releases下载对应的安装包包
  wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.3.tar.gz

• 解压 tar -zxvf elasticsearch-6.4.3.tar.gz

• 修改配置文件,默认不支持远程连接

  cluster.name: es6
  node.name: node0
  path.data: /usr/local/elasticsearch-6.4.3/data
  path.logs: /usr/local/elasticsearch-6.4.3/logs
  network.host: 0.0.0.0
  

• ElasticSearch 可以接收脚本执行,默认不支持root用户启动

  • 添加专门用户useradd elastic
  • 修改解压后elasticsearch文件夹所属用户chown -R elastic:elastic elasticsearch-6.4.3
  • 切换用户su elsearch后台启动./elasticsearch -d

• 启动后会占用两个端口

  • 9200 是ES节点与外部通讯使用的端口, 是http协议的RESTful接口.
  • 9300 是ES节点之间通讯使用的端口, 是tcp通讯端口，集群间和TCPclient都走的9300。（java程序中使用ES时，在配置文件中要配置该端口）

中文分词

• 下载地址https://github.com/medcl/elasticsearch-analysis-ik/releases

  wget https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.4.3/elasticsearch-analysis-ik-6.4.3.zip

  解压到/plugins/ik下面

图形化界面 kibana

• 官网地址https://www.elastic.co/cn/downloads/past-releases#kibana

  wget https://artifacts.elastic.co/downloads/kibana/kibana-6.4.3-linux-x86_64.tar.gz

问题及处理

• 线程数不够

  • 错误日志

    ERROR: [2] bootstrap checks failed
    [1]: max number of threads [3000] for user [elastic] is too low, increase to at least [4096]
    

  • vi /etc/security/limits.conf

    * soft nofile 65536
    * hard nofile 65536
    * soft nproc 65536
    * hard nproc 65536
    

• max_map_count too low

  • 错误日志

    ERROR: [1] bootstrap checks failed
    [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
    

  • vi /etc/sysctl.conf

    vm.max_map_count = 655360