1.Elasticsearch安装配置

参考：

1. Elasticsearch官方文章

---

说明

• 系统：CentOS Linux release 7.3.1611 (Core)
• elasticsearch版本
  elasticsearch-6.2.4（当前最新版）
• elasticsearch运行用户、组：
  • 用户: elasticsearch
  • 组: elasticsearch
• 目录：
  /data/soft/elasticsearch-6.2.4
• 工具：
  aria2c多线程下载

---

前置说明：

1. 需要单独安装配置java环境

---

安装

1. 下载elasticsearch6.2.4
   aria2c https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.4.tar.gz
2. 解压
   tar -zxvf elasticsearch-6.2.4.tar.gz

---

创建用户、用户组

1. 创建用户组
   groupadd elasticsearch
2. 创建用户
   useradd -s /sbin/nologin -g elasticsearch elasticsearch
3. 将elasticsearch6.2.4目录属主设置成elasticsearch
   chown -R elasticsearch: elasticsearch-6.2.4

---

配置

• elasticsearch.yml

  # config
  cluster.name: ai-log
  node.name: node1
  
  # 绑定ip
  network.host: 10.0.0.1
  http.port: 9200
  
  # 配置目录
  path.data: /data/soft/elasticsearch-6.2.4/data
  path.logs: /data/soft/elasticsearch-6.2.4/logs
  
  # 发现节点
  # discovery.zen.ping.unicast.hosts:
  #     - 10.0.0.2:9300
  
  # 最低master节点数
  discovery.zen.minimum_master_nodes: 1
  
  # 主节点+数据节点
  node.master: true
  node.data: true
  
  # 设置队列长度
  thread_pool.bulk.queue_size: 2000
  thread_pool.index.queue_size: 2000
  
  # 支持跨域
  http.cors.allow-origin: "*"
  http.cors.enabled: true
  http.cors.allow-headers : X-Requested-With,X-Auth-Token,Content-Type,Content-Length,Authorization
  http.cors.allow-credentials: true
  

• jvm.options

  • 设置jvm内存，请根据本机内存设置

    -Xms4g
    -Xmx4g
    

---

配置systemctl管理

1. 修改系统参数vm.max_map_count

   • 创建文件/usr/lib/sysctl.d/elasticsearch.conf

     vm.max_map_count=262144
     

   • 加载配置文件
     sysctl -p /usr/lib/sysctl.d/elasticsearch.conf
   • 查看参数
     sysctl -a | grep vm.max_map_count，如果修改成功则ok

2. 添加systemctl配置文件

   • 创建文件/usr/lib/systemd/system/elasticsearch.service

     [Unit]
     Description=Elasticsearch
     Documentation=http://www.elastic.co
     Wants=network-online.target
     After=network-online.target
     
     [Service]
     RuntimeDirectory=elasticsearch
     Environment=ES_HOME=/data/soft/elasticsearch-6.2.4
     Environment=ES_PATH_CONF=/data/soft/elasticsearch-6.2.4/config
     Environment=PID_DIR=/var/run/elasticsearch
     EnvironmentFile=-/etc/sysconfig/elasticsearch
     
     WorkingDirectory=/data/soft/elasticsearch-6.2.4
     
     User=elasticsearch
     Group=elasticsearch
     
     ExecStart=/data/soft/elasticsearch-6.2.4/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet
     
     # StandardOutput is configured to redirect to journalctl since
     # some error messages may be logged in standard output before
     # elasticsearch logging system is initialized. Elasticsearch
     # stores its logs in /var/log/elasticsearch and does not use
     # journalctl by default. If you also want to enable journalctl
     # logging, you can simply remove the "quiet" option from ExecStart.
     StandardOutput=journal
     StandardError=inherit
     
     # Specifies the maximum file descriptor number that can be opened by this process
     LimitNOFILE=65536
     
     # Specifies the maximum number of processes
     LimitNPROC=4096
     
     # Specifies the maximum size of virtual memory
     LimitAS=infinity
     
     # Specifies the maximum file size
     LimitFSIZE=infinity
     
     # Disable timeout logic and wait until process is stopped
     TimeoutStopSec=0
     
     # SIGTERM signal is used to stop the Java process
     KillSignal=SIGTERM
     
     # Send the signal only to the JVM rather than its control group
     KillMode=process
     
     # Java process is never killed
     SendSIGKILL=no
     
     # When a JVM receives a SIGTERM signal it exits with code 143
     SuccessExitStatus=143
     
     [Install]
     WantedBy=multi-user.target
     

3. systemctl管理
   systemctl start elasticsearch.service
   systemctl stop elasticsearch.service
   systemctl restart elasticsearch.service
   systemctl status elasticsearch.service

---

注意事项

1. elasticsearch不能使用root用户启动
2. 如果使用elasticsearch用户启动，请确保elasticsearch用户对 elasticsearch6.2.4目录有权限
3. 注意系统参数有未修改成功，比如：vm.max_map_count
4. jvm.options配置文件里的-Xms4g、-Xmx4g参数根据自己机器内存设置成合适的值