这里选择的elasticsearch为5.6的新版本，根据官方文档有几种暗装方式：
https://www.elastic.co/guide/en/elasticsearch/reference/current/install-elasticsearch.html
这里选择rpm包安装https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html
1、wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.1.rpm
2、查看有哪些配置文件
[root@node1 ~]# cd /etc/elasticsearch/ [root@node1 elasticsearch]# ll 总用量 20 -rw-rw----. 1 root elasticsearch 3024 9月 19 14:00 elasticsearch.yml -rw-rw----. 1 root elasticsearch 3123 9月 18 10:38 jvm.options -rw-rw----. 1 root elasticsearch 4456 9月 7 11:12 log4j2.properties drwxr-x---. 2 root elasticsearch 4096 9月 7 11:12 scripts
elasticsearch常用配置在elasticsearch.yml文件中，关于jvm的一些配置在jvm.options文件中，日志的配置在log4j2.properties文件中
[root@node1 elasticsearch]# grep -v "^#" /etc/elasticsearch/elasticsearch.yml cluster.name: my-elastic node.name: node1 network.host: 0.0.0.0 http.port: 9200
简单配置之后然后启动服务：/etc/init.d/elasticsearch start
默认日志文件为/var/log/elasticsearch/目录下，启动有报错都可以根据报错解决
这里将一些遇到的报错及解决方法列一些出来：
[root@node1 elasticsearch]# cat /etc/security/limits.d/90-nproc.conf # Default limit for number of user's processes to prevent # accidental fork bombs. # See rhbz #432903 for reasoning.* soft nproc 2048 root soft nproc unlimited
[root@node1 elasticsearch]# grep -v "^#" /etc/elasticsearch/elasticsearch.yml cluster.name: my-elastic node.name: node1 bootstrap.system_call_filter: false network.host: 0.0.0.0 http.port: 9200
重新启动elasticsearch服务，查看日志是否报错，如没有报错，浏览器进行访问是否有效：
现在为elasticsearch安装上插件head，利用github找到head插件：
https://github.com/mobz/elasticsearch-head，根据文中说明：
There are multiple ways of running elasticsearch-head.
Running with built in server
git clone git://github.com/mobz/elasticsearch-head.gitcd elasticsearch-headnpm installnpm run start
openhttp://localhost:9100/
This will start a local webserver running on port 9100 serving elasticsearch-head
Running as a plugin of Elasticsearch (deprecated)
- for Elasticsearch 5.x: site plugins are not supported. Run as a standalone server
elasticsearch5.x以上需要安装head插件需要作为一个单独的服务，步骤如上，于是开始安装：
如果没有npm命令需要首先安装上：
git clone git://github.com/mobz/elasticsearch-head.git cd elasticsearch-head npm install npm run start
默认监听在0.0.0.0，不需要修改监听地址
这里有两种启动方式：
1、npm run start（仓库拉取下来的elasticsearch-head目录下执行）
2、[root@node1 elasticsearch-head]# ./node_modules/grunt/bin/grunt server
启动后都是如下效果：
[root@node1 elasticsearch-head]# ./node_modules/grunt/bin/grunt server Loading "watch.js" tasks...ERROR >> Error: Cannot find module 'http-parser-js'Running "connect:server" (connect) task Waiting forever... Started connect web server on http://localhost:9100
查看日志：
[2017-09-19T13:50:36,288][INFO ][o.e.p.PluginsService ] [node1] no plugins loaded
[2017-09-19T13:50:38,401][INFO ][o.e.d.DiscoveryModule ] [node1] using discovery type [zen]
[2017-09-19T13:50:39,079][INFO ][o.e.n.Node ] [node1] initialized
[2017-09-19T13:50:39,079][INFO ][o.e.n.Node ] [node1] starting ...
[2017-09-19T13:50:39,239][INFO ][o.e.t.TransportService ] [node1] publish_address {192.168.44.134:9300}, bound_addresses {[::]:9300}
9100端口已经监听了，访问浏览器http://192.168.44.134:9100却依然连接不到集群，然后谷歌到需要进行设置：
check http.cors.enabled and http.cors.allow-origin are set in config/elasticsearch.yml in order to enable cors.
Reference : https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-http.html
然后配置elastic，具体配置如下：
[root@node1 elasticsearch]# grep -v "^#" /etc/elasticsearch/elasticsearch.yml cluster.name: my-elastic node.name: node1 bootstrap.system_call_filter: false http.cors.enabled: true http.cors.allow-origin: "*" network.host: 0.0.0.0 http.port: 9200
重启服务之后，浏览器访问
至此elasticsearch5.6版本安装head插件成功！！！
插件head的一些配置，如果node1不是监听在0.0.0.0而是ip：
还有一个配置文件：（我这里没有hostname这个选项）
