CentOS 7 安装 ElasticSearch

1、解压压缩包，创建文件夹

$ mkdir -p /usr/java

$ cd /usr/java

使用ftp工具把安装包放到java目录下，解压

$ tar -zxvf elasticsearch-6.6.1.tar.gz

$ mv elasticsearch-6.6.1 elasticsearch

$ mkdir -p ./elasticsearch/data

$ mkdir -p ./elasticsearch/logs

2、创建用户

$ groupadd elasticsearch

$ useradd -r -g elasticsearch elasticsearch

$ chown -R elasticsearch:elasticsearch elasticsearch

3、修改配置文件

$ vi elasticsearch/config/elasticsearch.yml

path.data: /usr/java/elasticsearch/data

path.logs: /usr/java/elasticsearch/logs

4、启动问题

启动：$ /usr/java/elasticsearch/bin/elasticsearch

• 无法使用root启动

can not run elasticsearch as root

elasticsearch不允许用root启动

• 无法创建本地线程问题,用户最大可创建线程数太小

max number of threads [2048] for user [es] is too low, increase to at least [4096]

修改$ vi /etc/security/limits.d/20-nproc.conf

添加

elasticsearch soft nproc 4096

• 最大虚拟内存太小

max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

$ vi /etc/sysctl.conf

在文件最后面添加内容:

vm.max_map_count=262144

刷新：$ sysctl -p

• 无法创建本地文件问题,用户最大可创建文件数太小

max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

$ vi /etc/security/limits.conf

elasticsearch soft nofile 65536
elasticsearch hard nofile 131072
elasticsearch soft nproc 4096　
elasticsearch hard nproc 4096　

修改后重启才能生效$ sudo reboot

5、测试

$ curl "127.0.0.1:9200"

6、防火墙开放端口

添加：$ sudo firewall-cmd --zone=public --add-port=9200/tcp --permanent
$ sudo firewall-cmd --zone=public --add-port=9300/tcp --permanent
重启：$ sudo firewall-cmd --reload
查看：$ firewall-cmd --zone=public --list-port

7、添加ik中文分词

./bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.6.1/elasticsearch-analysis-ik-6.6.1.zip

或者

cd your-es-root/plugins/ && mkdir ik && cd ik

unzip elasticsearch-analysis-ik-6.6.1.zip

chown -R elasticsearch:elasticsearch .

chmod 755 ./*

rm -f elasticsearch-analysis-ik-6.6.1.zip

8、添加到服务

在/etc/rc.d/init.d下创建elasticsearch
$ touch /etc/rc.d/init.d/elasticsearch
$ chmod 755 /etc/rc.d/init.d/elasticsearch
$ vi /etc/rc.d/init.d/elasticsearch

#!/bin/sh
#chkconfig: 2345 80 05
#description: elasticsearch
 
export JAVA_HOME=/usr/java/jdk
export JAVA_BIN=${JAVA_HOME}/bin
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH

es_user=elasticsearch
es_home=/usr/java/elasticsearch
 
case "$1" in
    start)
        su ${es_user} <<EOF
            cd $es_home
            ./bin/elasticsearch -d
EOF
        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 ${es_user}<<EOF
            cd $es_home
            ./bin/elasticsearch -d
EOF
        echo "elasticsearch startup"
    ;;
    *)
        echo "start|stop|restart"
    ;;
esac


exit $?

$ chkconfig elasticsearch on
$ chown -R elasticsearch:elasticsearch /usr/java/elasticsearch
$ sudo reboot

ElasticSearch 集群