CENTOS安装ElasticSearch

CENTOS安装ElasticSearch

ElasticSearch 概述

ElasticSearch是一个高可扩展的开源的全文搜索分析引擎。 

它允许你快速的存储、搜索和分析大量数据。ElasticSearch通常作为后端程序，为需要复杂查询的应用提供服务。
Elasticsearch是一个基于Lucene的开源分布式搜索引擎，具有分布式多用户能力。Elasticsearch是用java开发，提供Restful接口，能够达到实时搜索、高性能计算；同时Elasticsearch的横向扩展能力非常强，不需要重启服务，基本上达到了零配置。

ElasticSearch 安装

安装前准备

安装JDK7及以上版本(这里不再讲述JDK安装步骤)
下载ElasticSearch安装包，点击 获取elasticsearch-2.1.1.tar.gz安装包

安装ElasticSearch

运行下面命令将安装包移动到 /opt 目录，然后转到 opt 目录

mv elasticsearch-2.1.1.tar.gz /opt cd /opt

解压安装包,然后重命名为 elasticsearch

tar zxvf elasticsearch-2.1.1.tar.gz
mv elasticsearch-2.1.1 elasticsearch

进入elasticsearch/bin下运行elasticsearch脚本启动

cd elasticsearch/bin
./elasticsearch

如果是用root启动，需要继续下面步骤

如果是用root账号启动，会报以下错误

Exception in thread "main" java.lang.RuntimeException: don't run elasticsearch as root. at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93) at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144) at org.elasticsearch.bootstrap.Bootstrap.in
1250b
it(Bootstrap.java:285) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35) Refer to the log for complete error details.

这是出于系统安全考虑设置的条件。由于ElasticSearch可以接收用户输入的脚本并且执行，为了系统安全考虑， 

建议创建一个单独的用户用来运行ElasticSearch

创建elsearch用户组及elsearch用户

groupadd elsearch
useradd elsearch -g elsearch -p elasticsearch

更改elasticsearch文件夹及内部文件的所属用户及组为elsearch:elsearch

cd /opt
chown -R elsearch:elsearch  elasticsearch

切换到elsearch用户再启动

su elsearch cd elasticsearch/bin
./elasticsearch

启动后打印信息如下

[2015-12-30 10:15:44,876][WARN ][bootstrap                ] unable to install syscall filter: prctl(PR_GET_NO_NEW_PRIVS): Invalid argument
[2015-12-30 10:15:45,175][INFO ][node                     ] [Grim Hunter] version[2.1.1], pid[26383], build[40e2c53/2015-12-15T13:05:55Z]
[2015-12-30 10:15:45,176][INFO ][node                     ] [Grim Hunter] initializing ...
[2015-12-30 10:15:45,243][INFO ][plugins                  ] [Grim Hunter] loaded [], sites []
[2015-12-30 10:15:45,272][INFO ][env                      ] [Grim Hunter] using [1] data paths, mounts [[/ (/dev/mapper/vg_yong-lv_root)]], net usable_space [33.3gb], net total_space [49gb], spins? [no], types [ext4]
[2015-12-30 10:15:47,318][INFO ][node                     ] [Grim Hunter] initialized
[2015-12-30 10:15:47,318][INFO ][node                     ] [Grim Hunter] starting ...
[2015-12-30 10:15:47,388][INFO ][discovery                ] [Grim Hunter] elasticsearch/fnXUCLOQQBiC1aR7hhB82Q
[2015-12-30 10:15:50,442][INFO ][cluster.service          ] [Grim Hunter] new_master {Grim Hunter}{fnXUCLOQQBiC1aR7hhB82Q}{127.0.0.1}{127.0.0.1:9300}, reason: zen-disco-join(elected_as_master, [0] joins received)
[2015-12-30 10:15:50,491][INFO ][node                     ] [Grim Hunter] started
[2015-12-30 10:15:50,526][INFO ][gateway                  ] [Grim Hunter] recovered [0] indices into cluster_state

ElasticSearch后端启动命令

./elasticsearch -d