elasticsearch是一个基于Lucene的搜索服务器，应用非常广泛，应用的前题是先装到机器上，下面开始安装吧

由于elasticsearch是由java开发，所以首先安装java

 # yum install -y epel-release  
 # yum install -y java-1.8.0-openjdk.x86_64

然后安装elasticsearch

1.导入key

# rpm --import https://packages.elastic.co/GPG-KEY-elasticsearch

2.添加源 在/etc/yum.repos.d/添加文件elasticsearch.repo

[elasticsearch-2.x]
name=Elasticsearch repository for 2.x packages
baseurl=https://packages.elastic.co/elasticsearch/2.x/centos
gpgcheck=1
gpgkey=https://packages.elastic.co/GPG-KEY-elasticsearch
enabled=1

3.安装

# yum install -y elasticsearch #安装
# systemctl enable  elasticsearch  #设为开机启动
# systemctl start elasticsearch #启动

4.查看心跳

# curl http://localhost:9200/_cat/health?v
epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1475815333 12:42:13  elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%

5.配置可对外访问并配置集群

修改配置文件/etc/elasticsearch/elasticsearch.yml

 network.host: 0.0.0.0   #设置可访问的ip，这样使用各种方式都可进行http访问
 http.port: 9200   #公开的端口
 discovery.zen.ping.unicast.hosts: ["127.0.0.1","192.168.91.188"]    #组成集群的主机列表

同理，在192.168.91.188做1，2，3，4，5，步骤，并设置节点名称

node.name: node-1

6.获取集群下所有节点

访问：http://192.168.91.187:9200/_cat/nodes?v
host           ip             heap.percent ram.percent load node.role master name     
192.168.91.187 192.168.91.187            2          90 0.19 d         m      Balthakk 
192.168.91.188 192.168.91.188            5          91 0.01 d         *      node-1