elasticsearch安装

预先需要安装java8

1. 源码包准备：

首先到官网下载jdk，http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

2、解压源码包

sudo mkdir /usr/local/java
cp jdk-8u25-linux-x64.tar.gz /usr/local/java
cd /usr/local/java
sudo tar xvf jdk-8u25-linux-x64.tar.gz
sudo rm jdk-8u25-linux-x64.tar.gz

3、设置jdk环境变量

sudo vim ~/.bashrc

打开之后在末尾添加：

export JAVA_HOME=/usr/local/java/jdk1.8.0_25  
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export PATH=${JAVA_HOME}/bin:$PATH

使配置生效，执行命令：

source ~/.bashrc

4、检验是否安装成功

在终端输入如下命令

java -version

以上java安装参考来源：https://www.linuxidc.com/Linux/2015-01/112030.htm

安装elasticsearch：

https://www.elastic.co/guide/en/elasticsearch/reference/current/zip-targz.html

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.4.tar.gz 
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.4.tar.gz.sha512 
shasum -a 512 -c elasticsearch-6.2.4.tar.gz.sha512 
tar -xzf elasticsearch-6.2.4.tar.gz 
cd elasticsearch-6.2.4/

启动：

./bin/elasticsearch

到此安装完成。

可能出现的问题：

There is insufficient memory for the Java Runtime Environment to continue.

解决方法：
打开vim config/jvm.options 找到-Xms2g -Xmx2g(有的时-Xms1g -Xmx1g)，改成如下：

#Xms represents the initial size of total heap space
#Xmx represents the maximum size of total heap space 
-Xms512m
-Xmx512m