Centos 6.7安裝Elasticsearch2.3.3

Centos 6.7安裝Elasticsearch2.3.3

閑來無事，就來學習下被稱為新全文的Elasticsearch。新手第一次裝新全文，問題還是挺多的。

1.關於Elasticsearch

Elasticsearch是一個基於Lucene的搜尋工具，它使用Java開發並且使用Lucene作為核心來實現索引和搜尋的功能。但是它的目的是通過簡單的Restful API來隱藏Lucene的複雜性，從而讓全文檢索搜尋變得簡單。

但是，Elasticsearch不僅僅是Lucene和全文檢索搜尋，我們還能這樣去描述它：
1)分布式的即時檔案儲存體，每個欄位都被索引並可被搜尋
2)分布式的即時分析搜尋引擎
3)可以擴充到上百台伺服器，處理PB級結構化或非結構化資料
而且，所有的這些功能被整合到一個服務裡面，你的應用可以通過簡單的RestfulAPI、各種語言的用戶端甚至命令列與之互動。

2. 下載最新版的Elasticsearch的安裝包，該版本可直接部署到Linux系統上

安裝之前，請確認已安裝好最新版的JDK版本，安裝步驟請參照其他網友文章。最好把安裝的工具包放在/opt目錄，本人安裝在centos 6.7下的/home目錄下使用，wget命令得到該zip安裝包。

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1. Elasticsearch2.3.3
2. ZIPhttps://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/zip/elasticsearch/2.3.3/elasticsearch-2.3.3.zip</span>
3. Woohoo!Yourdownloadisalmostcomplete!It'sclearyou'reabouttodogreatthingswithdata.Whetherthisisyourfirst,tenth,orumpteenthdownloadofanopensourceElasticproject,there'salwayssomethingnewtolearn.
5. So,beforeyoudiveintothedocumentation,haveaganderatthegoodnessbelow.Trysomethingnew,expandtoanewusecase,thinkupsomethingtotallynovel,and,aboveall,staycurious.

3. 正式安裝Elasticsearch

在root使用者，/home目錄下解壓zip包，建立軟串連In -s Elasticsearch2.3.3 elasticsearch，cd /elasticsearch後，執行 ./bin/elasticsearch，會出現如下的錯誤：

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1. [root@xxxxbin]#./elasticsearch
2. Exceptioninthread"main"java.lang.RuntimeException:don'trunelasticsearchasroot.</span>
3. atorg.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93)
4. atorg.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144)
5. atorg.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:270)
6. atorg.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
7. Refertothelogforcompleteerrordetails.

這是Elasticsearch出於系統安全考慮設定的條件。由於Elasticsearch可以接收使用者輸入的指令碼並且執行，為了系統安全考慮，因此可以建立一個單獨的使用者用來運行Elasticsearch。

1) 建立單獨的使用者組和elsearch使用者：

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1. groupaddelsearch
2. useraddelsearch-gelsearch-pelasticsearch

2) 更改/home/elasticsearch使用者及組：

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1. <spanstyle="white-space:pre"></span></span>cd/home
2. <spanstyle="white-space:pre"></span></span>chown-Relsearch:elsearchelasticsearch

3) 使用elsearch使用者執行安裝命令

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1. <spanstyle="white-space:pre"></span></span>suelsearch
2. <spanstyle="white-space:pre"></span></span>cdelasticsearch/bin執行./elasticsearch

4. 關於安裝plugins(外掛程式管理)

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1. Exceptioninthread"main"java.lang.IllegalStateException:Unabletoaccess'path.plugins'(/home/hye/elasticsearch/plugins)
2. Likelyrootcause:java.nio.file.AccessDeniedException:/home/hye/elasticsearch/plugins
3. atsun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
4. atsun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
5. atsun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
6. atsun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
7. atjava.nio.file.Files.createDirectory(Files.java:674)
8. atjava.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
9. atjava.nio.file.Files.createDirectories(Files.java:767)
10. atorg.elasticsearch.bootstrap.Security.ensureDirectoryExists(Security.java:337)
11. atorg.elasticsearch.bootstrap.Security.addPath(Security.java:314)
12. atorg.elasticsearch.bootstrap.Security.addFilePermissions(Security.java:246)
13. atorg.elasticsearch.bootstrap.Security.createPermissions(Security.java:212)
14. atorg.elasticsearch.bootstrap.Security.configure(Security.java:118)
15. atorg.elasticsearch.bootstrap.Bootstrap.setupSecurity(Bootstrap.java:196)
16. atorg.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:167)
17. atorg.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:270)
18. atorg.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
19. Refertothelogforcompleteerrordetails.

請按照官網的plguins Managerment的介紹和安裝方法進行安裝：

4.1安裝前的準備

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1. Runningasroot
2. IfElasticsearchwasinstalledusingthedeborrpmpackagethenrunbin/pluginasrootsoitcanwritetotheappropriatefilesondisk.Otherwiserunbin/pluginastheuserthatownsalloftheElasticsearchfiles.

4.2 正式安裝plugins外掛程式

本人安裝的是Core Elasticsearch plugins，按照圖中的安裝步驟，完成安裝。

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1. PluginManagement
2. CoreElasticsearchpluginsedit
3. CoreElasticsearchpluginscanbeinstalledasfollows:
4. sudobin/plugininstall[plugin_name]
5. Forinstance,toinstallthecoreICUplugin,justrunthefollowingcommand:
6. sudobin/plugininstallanalysis-icu
7. ThiscommandwillinstalltheversionofthepluginthatmatchesyourElasticsearchversion.
8. Communityandnon-corepluginsedit
9. Non-corepluginsprovidedbyElasticsearch,orpluginsprovidedbythecommunity,canbeinstalledfromdownload.elastic.co,fromMaven(CentralandSonatype),orfromGitHub.Inthiscase,thecommandisasfollows:
10. sudobin/plugininstall[org]/[user|component]/[version]</span><spanstyle="font-size:14px;">

5. 啟動Elasticsearch

使用非root使用者進行安裝：

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1. <spanstyle="white-space:pre"></span>suelsearch
2. <spanstyle="white-space:pre"></span>cdelasticsearch/bin
3. <spanstyle="white-space:pre"></span>./elasticsearch

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1. 如果想要Elasticsearch在後端運行：
2. <spanstyle="white-space:pre"></span>./elasticsearch-d

控制台顯示：(啟動Elasticsearch成功)

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1. [elsearch@xhyu-100elasticsearch]$./bin/elasticsearch
2. [2016-06-1900:27:24,188][WARN][bootstrap]unabletoinstallsyscallfilter:seccompunavailable:CONFIG_SECCOMPnotcompiledintokernel,CONFIG_SECCOMPandCONFIG_SECCOMP_FILTERareneeded
3. [2016-06-1900:27:24,417][INFO][node][Mad-Dog]version[2.3.3],pid[4260],build[218bdf1/2016-05-17T15:40:04Z]
4. [2016-06-1900:27:24,417][INFO][node][Mad-Dog]initializing...
5. [2016-06-1900:27:25,040][INFO][plugins][Mad-Dog]modules[reindex,lang-expression,lang-groovy],plugins[analysis-icu],sites[]
6. [2016-06-1900:27:25,066][INFO][env][Mad-Dog]using[1]datapaths,mounts[[/(/dev/sda3)]],netusable_space[33.4gb],nettotal_space[45.6gb],spins?[possibly],types[ext4]
7. [2016-06-1900:27:25,066][INFO][env][Mad-Dog]heapsize[1015.6mb],compressedordinaryobjectpointers[true]
8. [2016-06-1900:27:25,066][WARN][env][Mad-Dog]maxfiledescriptors[4096]forelasticsearchprocesslikelytoolow,considerincreasingtoatleast[65536]
9. [2016-06-1900:27:27,264][INFO][node][Mad-Dog]initialized
10. [2016-06-1900:27:27,264][INFO][node][Mad-Dog]starting...
11. [2016-06-1900:27:27,330][INFO][transport][Mad-Dog]publish_address{192.168.31.200:9300},bound_addresses{192.168.31.200:9300}
12. [2016-06-1900:27:27,333][INFO][discovery][Mad-Dog]elasticsearch/-H0Z_q6iRsuYDXd1b1jCAg
13. [2016-06-1900:27:30,390][INFO][cluster.service][Mad-Dog]new_master{Mad-Dog}{-H0Z_q6iRsuYDXd1b1jCAg}{192.168.31.200}{192.168.31.200:9300},reason:zen-disco-join(elected_as_master,[0]joinsreceived)
14. [2016-06-1900:27:30,420][INFO][http][Mad-Dog]publish_address{192.168.31.200:9200},bound_addresses{192.168.31.200:9200}
15. [2016-06-1900:27:30,420][INFO][node][Mad-Dog]started
16. [2016-06-1900:27:30,441][INFO][gateway][Mad-Dog]recovered[0]indicesintocluster_state

6. Elasticsearch介面驗證失敗，修改Elasticsearch設定檔

未修改設定檔前，使用非root使用者進行elasticsearch安裝。

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1. [root@xxxxelasticsearch]#curl-XGEThttp://機器ip:9200/
2. curl:(7)couldn'tconnecttohost

按照網上的文章和官網安裝說明，並沒有修改預設設定檔的說法。

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1. /home/hye/elasticsearch/config

修改完後，開啟驗證介面，最好找個好點瀏覽器，QQ瀏覽器就別用了。可以用Chrome瀏覽器。

在介面輸入：http://安裝機器ip:9200/，頁面回饋資訊如下：

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1. {
2. "name":"Mad-Dog",
3. "cluster_name":"elasticsearch",
4. "version":{
5. "number":"2.3.3",
6. "build_hash":"218bdf10790eef486ff2c41a3df5cfa32dadcfde",
7. "build_timestamp":"2016-05-17T15:40:04Z",
8. "build_snapshot":false,
9. "lucene_version":"5.5.0"
10. },
11. "tagline":"YouKnow,forSearch"
12. }

至此，安裝結束。。。