安装ElasticSearch
1、安装java
yum install -y java
查看java安装结果
java -version
2、下载elastic安装包，并解压
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.0.tar.gz
tar -zxvf elasticsearch-6.5.0.tar.gz -C /usr/local/
3、添加新账户，es不能再在root账户中启动
adduser esuser
passwd esuser
4、对Elastic文件授权
chown -R esuser/usr/local/elasticsearch-5.6.3/
5、切换账户
cd /usr/local/elasticsearch-5.6.3/ su esuser
6、修改Elastic配置/config/elasticsearch.yml
network.host: 192.168.0.168
http.port: 9200
7、启动elastic
bin/elasticsearch（加“ -d ”可以后台运行）
访问链接192.168.0.129:9200，出现下面内容
启动时遇到的问题
1、“OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N”
解决方案：
在jvm.options中添加-XX:-AssumeMP,文件在ES安装目录下：/config/jvm.options
2、提示端口未打开
解决方案：
在iptables中放开9200,9300端口（9200是http服务端口，9300是tcp服务端口），配置文件（/etc/sysconfig/iptables）中添加
-A INPUT -p tcp -m state --state NEW -m tcp --dport 9200 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 9300 -j ACCEPT
或者直接打开9200-9400之间的所有端口
-A INPUT -p tcp -m state --state NEW -m tcp --dport 9200:9400 -j ACCEPT
3、“max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]”
解决方案：
su root vim /etc/sysctl.conf
添加
vm.max_map_count=655360
保存退出，然后使配置生效
sysctl -p
4、“max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]”
解决方案：
su root vim /etc/security/limits.conf
添加下面的
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096