安装java环境

• 先看下本机是否已经安装，Elasticsearch最低支持java1.7

yum list installed |grep java

• 如果没有安装请先安装，查看yum库中的java安装包

yum -y list java*

• 安装java-1.8.0

yum -y install java-1.8.0-openjdk*

• 安装完成后查看java版本

[root@VM_145_20_centos ~]# java -version
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

• 配置环境变量

vim /etc/profile

• 在文件的末尾加上下面的代码，注意代码中的java-1.8.0*，请根据实际安装的来

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

• 检测一下，OK（额，我有强迫症哈哈）,记得source 使配置文件生效

[root@VM_145_20_centos ~]# source /etc/profile  
[root@VM_145_20_centos ~]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64

使用yum安装Elasticsearch

• 下载并安装ES的yum公钥

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

• 配置Elasticsearch的yum源

vim /etc/yum.repos.d/elasticsearch.repo

• 输入下面的代码

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

• 更新yum的缓存

yum makecache

• 安装 Elasticsearch

yum install elasticsearch

测试 Elasticsearch 是否安装成功

• 配置服务

/sbin/chkconfig --add elasticsearch
systemctl start elasticsearch

• 测试访问

[root@VM_145_20_centos ~]# curl -X GET localhost:9200
{
  "name" : "Hyde",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "ji3aSaT4TAKuRO34a4twnQ",
  "version" : {
    "number" : "2.4.6",
    "build_hash" : "5376dca9f70f3abef96a77f4bb22720ace8240fd",
    "build_timestamp" : "2017-07-18T12:17:44Z",
    "build_snapshot" : false,
    "lucene_version" : "5.5.4"
  },
  "tagline" : "You Know, for Search"
}

• ip访问、外网访问、修改端口

vim /etc/elasticsearch/elasticsearch.yml

# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200
#

• 修改完了重启

 systemctl restart elasticsearch

• 浏览器中输入ip地址和端口访问试试，如果访问被拒绝，添加防火墙设置（我的阿里云服务器是需要设置的）

iptables -I INPUT -p tcp --dport 9200 -j ACCEPT