elasticsearch的探索之路

今天调试一个现有项目报错，

[Faraday::ConnectionFailed] Connection refused - connect(2) {:host=>"localhost", :port=>"9200", :protocol=>"http"}
Connection refused - connect(2)

发现自己还没装elasticsearch

找到官网下载页https://www.elastic.co/guide/en/elasticsearch/reference/current/_installation.html

看到第一句话发现自己还需要先装java：

Elasticsearch requires at least Java 7. Specifically as of this writing, it is recommended that you use the Oracle JDK version 1.8.0_25. Java installation varies from platform to platform so we won’t go into those details here. 

于是查阅了ubuntu安装java的指南，并且看了下stackoverflow里的大神经验贴

https://help.ubuntu.com/community/Java

http://stackoverflow.com/questions/16263556/installing-java-7-on-ubuntu

（1）开始使用大神经验贴里的步骤安装java

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

（2）装完java查看下就可以继续装elasticsearch啦

步骤就是官网下载页里提供的：

https://www.elastic.co/guide/en/elasticsearch/reference/current/_installation.html

java -version
echo $JAVA_HOME

curl -L -O https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.7.1.tar.gz

tar -xvf elasticsearch-1.7.1.tar.gz

cd elasticsearch-1.7.1/bin

./elasticsearch

If everything goes well, you should see a bunch of messages that look like below:

17,218][INFO ][node           ] [New Goblin] version[1.7.1], pid[2085], build[5c03844/2014-02-25T15:52:53Z]
[2014-03-13 13:42:17,219][INFO ][node           ] [New Goblin] initializing ...
[2014-03-13 13:42:17,223][INFO ][plugins        ] [New Goblin] loaded [], sites []
[2014-03-13 13:42:19,831][INFO ][node           ] [New Goblin] initialized
[2014-03-13 13:42:19,832][INFO ][node           ] [New Goblin] starting ...
[2014-03-13 13:42:19,958][INFO ][transport      ] [New Goblin] bound_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish_address {inet[/192.168.8.112:9300]}
[2014-03-13 13:42:23,030][INFO ][cluster.service] [New Goblin] new_master [New Goblin][rWMtGj3dQouz2r6ZFL9v4g][mwubuntu1][inet[/192.168.8.112:9300]], reason: zen-disco-join (elected_as_master)
[2014-03-13 13:42:23,100][INFO ][discovery      ] [New Goblin] elasticsearch/rWMtGj3dQouz2r6ZFL9v4g
[2014-03-13 13:42:23,125][INFO ][http           ] [New Goblin] bound_address {inet[/0:0:0:0:0:0:0:0:9200]}, publish_address {inet[/192.168.8.112:9200]}
[2014-03-13 13:42:23,629][INFO ][gateway        ] [New Goblin] recovered [1] indices into cluster_state
[2014-03-13 13:42:23,630][INFO ][node           ] [New Goblin] started

（3）还要安装rails集成的相关gem

https://github.com/elastic/elasticsearch-rails

gem install elasticsearch-model elasticsearch-rails