1.簡介

elasticsearch-head是一個介面化的叢集操作和管理工具，可以對叢集進行傻瓜式操作。你可以通過外掛把它整合到es（首選方式）,也可以安裝成一個獨立webapp。

es-head主要有三個方面的操作：

1. 顯示叢集的拓撲,並且能夠執行索引和節點級別操作
2. 搜尋介面能夠查詢叢集中原始json或表格格式的檢索資料
3. 能夠快速訪問並顯示叢集的狀態
4. 有一個輸入視窗,允許任意呼叫RESTful API。這個介面包含幾個選項,可以組合在一起以產生有趣的結果;
   　　1. 請求方法(get、put、post、delete),查詢json資料,節點和路徑
   　　2. 支援JSON驗證器
   　　3. 支援重複請求計時器
   　　4. 支援使用javascript表示式變換結果
   　　５. 收集結果的能力隨著時間的推移(使用定時器),或比較的結果
   　　6. 能力圖表轉換後的結果在一個簡單的條形圖(包括時間序列)

2.安裝

第一種安裝方式

1. 我們只介紹外掛的安裝方式，另外的方式大家看官方文件即可。ES-head作為外掛，有兩個安裝方式：

通過elasticseach自帶的plugin命令
如下圖：

D:\elasticsearch\elasticsearch-6.2.0\bin>elasticsearch-plugin install elasticsearch-head
A tool for managing installed elasticsearch plugins

Commands
--------
list - Lists installed elasticsearch plugins
install - Install a
 
 plugin
remove - removes a plugin from Elasticsearch

Non-option arguments:
command

Option         Description
------         -----------
-h, --help     show help
-s, --silent   show minimal output
-v, --verbose  show verbose output
ERROR: Unknown plugin elasticsearch-head

以前使用命令

elasticsearch/bin/plugin -install
 
 mobz/elasticsearch-head 

但是6.X版本，改成elasticsearch-plugin了，具體看下圖

但是沒有安裝成功。說沒有這個包（未解決）

第2種安裝方式

1. https://github.com/mobz/elasticsearch-head下載zip 解壓
2. 建立elasticsearch-2.3.1\plugins\head檔案
3. 將解壓後的elasticsearch-head-master資料夾下的檔案copy到head
4. 執行es
5. 開啟http://localhost:9200/_plugin/head/

安裝後執行es報錯如下

D:\elasticsearch\elasticsearch-6.2.0\bin>elasticsearch.bat
[2018-02-07T16:09:24,908][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: property [elasticsearch.version] is missing for plugin [head]
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.0.jar:6.2.0]
        at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.0.jar:6.2.0]
Caused by: java.lang.IllegalArgumentException: property [elasticsearch.version] is missing for plugin [head]
        at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.java:213) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Spawner.spawnNativePluginControllers(Spawner.java:75) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:167) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.0.jar:6.2.0]
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.0.jar:6.2.0]
        ... 6 more

D:\elasticsearch\elasticsearch-6.2.0\bin>

第3種安裝方式

6.X中，elasticsearch-head

1. 不能放在elasticsearch的 plugins、modules 目錄下
2. 不能使用 elasticsearch-plugin install

直接啟動elasticsearch即可

安裝 elasticsearch-head

1. 修改 elasticsearch/config/elasticsearch.yml
2. 新增

http.cors.enabled: true
http.cors.allow-origin: "*"

1. 下載 elasticsearch-head 或者 git clone 到隨便一個資料夾

我是直接下載到D:\elasticsearch\elasticsearch-6.2.0\myplungins\elasticsearch-head-master目錄的

1. cd D:\elasticsearch\elasticsearch-6.2.0\myplungins\elasticsearch-head-master

2. npm install -g grunt-cli
   grunt是一個很方便的構建工具，可以進行打包壓縮、測試、執行等等的工作

D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master>npm install -g grunt-cli
C:\Users\Administrator\AppData\Roaming\npm\grunt -> C:\Users\Administrator\AppData\Roaming\npm\node_modules\grunt-cli\bin\grunt
+ [email protected]
updated 1 package in 4.429s

1. npm install

  D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master>npm install
npm WARN deprecated [email protected]: Use the built-in module in node 9.0.0 or newer, instead
npm WARN deprecated [email protected]: CoffeeScript on NPM has moved to "coffeescript" (no hyphen)

> [email protected] install D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master\node_modules\phantomjs-prebuilt
> node install.js

PhantomJS not found on PATH
Download already available at C:\Users\ADMINI~1\AppData\Local\Temp\phantomjs\phantomjs-2.1.1-windows.zip
Verified checksum of previously downloaded file
Extracting zip contents
Removing D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master\node_modules\phantomjs-prebuilt\lib\phantom
Copying extracted folder C:\Users\ADMINI~1\AppData\Local\Temp\phantomjs\phantomjs-2.1.1-windows.zip-extract-1517991758740\phantomjs-2.1.1-windows -> D:\elasticsearch\elasticsearc
\elasticsearch-head-master\node_modules\phantomjs-prebuilt\lib\phantom
Writing location.js file
Done. Phantomjs binary available at D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master\node_modules\phantomjs-prebuilt\lib\phantom\bin\phantomjs.exe
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN [email protected] license should be a valid SPDX license expression
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 384 packages in 40.221s  

這一點第一次安裝會不一樣，會有進度條，我這是第二次，為了寫部落格

問題1：可能會報錯

Error making request.
Error: connect ETIMEDOUT 54.231.112.152:443
    at Object._errnoException (util.js:1022:11)
    at _exceptionWithHostPort (util.js:1044:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1182:14)

Please report this full log at https://github.com/Medium/phantomjs
npm WARN [email protected]0.0.0 license should be a valid SPDX license expression
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected]1.1.3 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected]2.1.16 install: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected]2.1.16 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2018-03-02T02_46_07_354Z-debug.log

原因：網路原因
解決方法：多次執行，總會成功的

1. grunt server

D:\elasticsearch\elasticsearch-6.2.0\myplugins\elasticsearch-head-master>grunt server
(node:3492) ExperimentalWarning: The http2 module is an experimental API.
Running "connect:server" (connect) task
Waiting forever...
Started connect web server on http://localhost:9100

10.啟動我們的elasticsearch

11.9100連結9200，並且測試，檢視叢集的健康狀況