[大数据]Linux部署elasticsearch

1. 下载安装包，解压
2. 进入config,修改配置文件

   vim elasticsearch.yml
   
   cluster.name: my_cluster ????????#ES集群名称
   
   node.name: linux_node-1 ?　 ???? #节点名称
   
   path.data: /usr/local/apps/elasticsearch/data ?#数据存储的目录（多个目录使用逗号分隔）
   
   path.logs: /var/log/elasticsearch ?????#日志保存位置
   
   network.host: 10.0.0.206 ??????????#设置本机IP地址，写内网地址无法访问
   
   http.port: 9200 ???????????????????#端口默认9200
   
   discovery.zen.ping.unicast.host?
   
   s: ["10.0.0.207", "10.0.0.208","10.0.0.209"]
   
   cluster.initial_master_nodes: ["linux_node-1"] #与节点node.name对应
   
   #bootstrap.memory_lock: true ????????????#锁住es内存，保证内存不分配至交换分区，实验中打开启动失败

3. 设置内存

   cd /usr/local/apps/elasticsearch/bin
   
   vim elasticsearch
   
   ES_JAVA_OPTS="-Xms512m -Xmx512m"
   
   (配置es内置jdk)
   
   export JAVA_HOME=/usr/local/apps/elasticsearch/elasticsearch-7.9.0/jdk
   
   export PATH=$JAVA_HOME:$PATH/bin

4. Linux 文件数设置

   [1]:max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536] 意思是elasticsearch可以创建的文件描述的个数太少
   
   vim /etc/security/limits.conf
   
   elasticsearch soft nofile 65536
   
   elasticsearch hard nofile 65535
   
   elasticsearch soft nproc 4096
   
   elasticsearch hard nproc 4096
   
   * 代表针对所有用户，noproc 是代表最大进程数，nofile 是代表最大文件打开数，使用ulimit -n查看

   [2]:max number of threads [3790] for user elasticsearch is too low, increase to at least [4096] ???意思是：用户线创建的线程数太少
   
   vim /etc/sysctl.conf ?
   
   增加配置值： vm.max_map_count=655360
   
   执行命令 sysctl -p ?

5. 启动用户：

   添加新用户组和用户，让非root 用户组用户启动：
   
   groupadd elasticsearch
   
   Useradd -g elasticsearch elasticsearch
   
   然后把我们的es 所在文件夹的 用户指定为 elasticsearch?
   
   chown -R elasticsearch: elasticsearch /usr/local/apps/elasticsearch

   6. 启动elasticsearch

   su - elasticsearch
   
   在bin 目录下
   
   ./elasticsearch -d ??????#-d后台启动

? ? ? ? 7. 查看elasticsearch节点状态?

# curl http://10.0.0.206:9200

?????????8. 设置开机自启

#!/bin/sh
#chkconfig: 2345 80 05
#description: elasticsearch
 
export JAVA_HOME=/usr/local/apps/java/jdk1.8
export JAVA_BIN=/usr/local/apps/java/jdk1.8/bin
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH
 
case "$1" in
start)
    su elasticsearch<<!
    cd /usr/local/apps/elasticsearch/elasticsearch-7.9.0
    ./bin/elasticsearch -d
!
    echo "elasticsearch startup"
    ;;  
stop)
    es_pid=`ps aux|grep elasticsearch | grep -v 'grep elasticsearch' | awk '{print $2}'`
    kill -9 $es_pid
    echo "elasticsearch stopped"
    ;;  
restart)
    es_pid=`ps aux|grep elasticsearch | grep -v 'grep elasticsearch' | awk '{print $2}'`
    kill -9 $es_pid
    echo "elasticsearch stopped"
    su elasticsearch<<!
    cd /usr/lcoal/apps/elasticsearch/elasticsearch-7.9.0
    ./bin/elasticsearch -d
!
    echo "elasticsearch startup"
    ;;  
*)
    echo "start|stop|restart"
    ;;  
esac
 
exit $?