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本篇內容介紹了“Centos7安裝ElasticSearch入門實例分析”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
1.下載elasticsearch 6.4.1
2.解壓壓縮包
[root@localhost elasticsearch]# tar -zxvf elasticsearch-6.4.1.tar.gz
3.啟動elasticsearch
[root@localhost bin]# ./elasticsearch
以后臺方式啟動
[root@localhost bin]# ./elasticsearch -d
tips:
[root@localhost bin]# ./elasticsearch [2018-09-19t19:46:09,817][warn ][o.e.b.elasticsearchuncaughtexceptionhandler] [] uncaught exception in thread [main] org.elasticsearch.bootstrap.startupexception: java.lang.runtimeexception: can not run elasticsearch as root at org.elasticsearch.bootstrap.elasticsearch.init(elasticsearch.java:140) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.elasticsearch.execute(elasticsearch.java:127) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.cli.environmentawarecommand.execute(environmentawarecommand.java:86) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.cli.command.mainwithouterrorhandling(command.java:124) ~[elasticsearch-cli-6.4.1.jar:6.4.1] at org.elasticsearch.cli.command.main(command.java:90) ~[elasticsearch-cli-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.elasticsearch.main(elasticsearch.java:93) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.elasticsearch.main(elasticsearch.java:86) ~[elasticsearch-6.4.1.jar:6.4.1] caused by: java.lang.runtimeexception: can not run elasticsearch as root at org.elasticsearch.bootstrap.bootstrap.initializenatives(bootstrap.java:104) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.bootstrap.setup(bootstrap.java:171) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.bootstrap.init(bootstrap.java:326) ~[elasticsearch-6.4.1.jar:6.4.1] at org.elasticsearch.bootstrap.elasticsearch.init(elasticsearch.java:136) ~[elasticsearch-6.4.1.jar:6.4.1]
elasticsearch 不能以root用戶角色啟動，因此需要將安裝目錄授權給其他用戶，用其他用戶來啟動
啟動成功后，驗證，打開新的終端，執行如下命令：
[root@localhost ~]# curl 'http://localhost:9200/?pretty'
{
"name" : "o5bavye",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "rw1yjlzksgodxkuvgixmxg",
"version" : {
"number" : "6.4.1",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "e36acdb",
"build_date" : "2018-09-13t22:18:07.696808z",
"build_snapshot" : false,
"lucene_version" : "7.4.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "you know, for search"
}
[root@localhost ~]#返回信息則表示安裝成功！
4.安裝kibana
sense 是一個 kibana 應用 它提供交互式的控制臺，通過你的瀏覽器直接向 elasticsearch 提交請求。 這本書的在線版本包含有一個 view in sense 的鏈接，里面有許多代碼示例。當點擊的時候，它會打開一個代碼示例的sense控制臺。 你不必安裝 sense，但是它允許你在本地的 elasticsearch 集群上測試示例代碼，從而使本書更具有交互性。
下載kibana
kibana是一個為 elasticsearch 提供的數據分析的 web 接口。可使用它對日志進行高效的搜索、可視化、分析等各種操作
下載完成解壓kibana
[root@localhost elasticsearch]# tar -zxvf kibana-6.4.1-linux-x86_64.tar.gz
修改 配置config目錄下的kibana.yml 文件,配置elasticsearch地址和kibana地址信息
server.host: "192.168.92.50" # kibana 服務器地址 elasticsearch.url: "http://192.168.92.50:9200" # es 地址
啟動 kibana
[root@localhost bin]# ./kibana
安裝kibana本機訪問：http://localhost:5601/
選擇dev tools菜單，即可實現可視化請求
5.安裝logstash
下載logstash
下載完成解壓后，config目錄下配置日志收集日志配置文件 logstash.conf
# sample logstash configuration for creating a simple
# beats -> logstash -> elasticsearch pipeline.
input {
tcp {
mode => "server"
host => "192.168.92.50"
port => 4560
codec => json_lines
}
}
output {
elasticsearch {
hosts => "192.168.92.50:9200"
index => "springboot-logstash-%{+yyyy.mm.dd}"
}
}配置成功后啟動logstatsh
[root@localhost bin]# ./logstash -f ../config/logstash.conf
es 一些基礎知識：
索引（名詞）：
如前所述，一個 索引 類似于傳統關系數據庫中的一個 數據庫 ，是一個存儲關系型文檔的地方。 索引 (index) 的復數詞為 indices 或 indexes 。
索引（動詞）：
索引一個文檔 就是存儲一個文檔到一個 索引 （名詞）中以便它可以被檢索和查詢到。這非常類似于 sql 語句中的 insert 關鍵詞，除了文檔已存在時新文檔會替換舊文檔情況之外。
倒排索引：
關系型數據庫通過增加一個 索引 比如一個 b樹（b-tree）索引 到指定的列上，以便提升數據檢索速度。elasticsearch 和 lucene 使用了一個叫做 倒排索引 的結構來達到相同的目的。
put /megacorp/employee/1
{
"first_name" : "john",
"last_name" : "smith",
"age" : 25,
"about" : "i love to go rock climbing",
"interests": [ "sports", "music" ]
}返回結果：
#! deprecation: the default number of shards will change from [5] to [1] in 7.0.0; if you wish to continue using the default of [5] shards, you must manage this on the create index request or with an index template
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}路徑 /megacorp/employee/1 包含了三部分的信息：
megacorp 索引名稱
employee 類型名稱
1 特定雇員的id
放置第二個雇員信息：
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}返回結果：
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}放置第三個雇員信息
{
"_index": "megacorp",
"_type": "employee",
"_id": "3",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}5.檢索文檔
檢索到單個雇員的數據
get /megacorp/employee/1
返回結果：
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_version": 1,
"found": true,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
}6.輕量搜索
一個 get 是相當簡單的，可以直接得到指定的文檔。 現在嘗試點兒稍微高級的功能，比如一個簡單的搜索！
第一個嘗試的幾乎是最簡單的搜索了。我們使用下列請求來搜索所有雇員：
get /megacorp/employee/_search
返回結果：
{
"took": 31,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 3,
"max_score": 1,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_score": 1,
"_source": {
"first_name": "jane",
"last_name": "smith",
"age": 32,
"about": "i like to collect rock albums",
"interests": [
"music"
]
}
},
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 1,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
},
{
"_index": "megacorp",
"_type": "employee",
"_id": "3",
"_score": 1,
"_source": {
"first_name": "douglas",
"last_name": "fir",
"age": 35,
"about": "i like to build cabinets",
"interests": [
"forestry"
]
}
}
]
}
}通過姓名模糊匹配來獲得結果
get /megacorp/employee/_search?q=last_name:smith
返回結果：
{
"took": 414,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 2,
"max_score": 0.2876821,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_score": 0.2876821,
"_source": {
"first_name": "jane",
"last_name": "smith",
"age": 32,
"about": "i like to collect rock albums",
"interests": [
"music"
]
}
},
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 0.2876821,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
}
]
}
}7.使用查詢表達式搜索
領域特定語言 （dsl）， 指定了使用一個 json 請求
get /megacorp/employee/_search
{
"query" : {
"match" : {
"last_name" : "smith"
}
}
}返回結果：
{
"took": 7,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 2,
"max_score": 0.2876821,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_score": 0.2876821,
"_source": {
"first_name": "jane",
"last_name": "smith",
"age": 32,
"about": "i like to collect rock albums",
"interests": [
"music"
]
}
},
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 0.2876821,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
}
]
}
}8.更復雜的搜索
搜索姓氏為 smith 的雇員，但這次我們只需要年齡大于 30 的，使用過濾器 filter ，它支持高效地執行一個結構化查詢
get /megacorp/employee/_search
{
"query" : {
"bool": {
"must": {
"match" : {
"last_name" : "smith"
}
},
"filter": {
"range" : {
"age" : { "gt" : 30 }
}
}
}
}
}其中：range 過濾器 ， 它能找到年齡大于 30 的文檔，其中 gt 表示_大于(_great than)
返回結果：
{
"took": 44,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.2876821,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_score": 0.2876821,
"_source": {
"first_name": "jane",
"last_name": "smith",
"age": 32,
"about": "i like to collect rock albums",
"interests": [
"music"
]
}
}
]
}
}9.全文搜索
搜索下所有喜歡攀巖（rock climbing）的雇員
get /megacorp/employee/_search
{
"query" : {
"match" : {
"about" : "rock climbing"
}
}
}返回結果：
{
"took": 17,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 2,
"max_score": 0.5753642,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 0.5753642,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
},
{
"_index": "megacorp",
"_type": "employee",
"_id": "2",
"_score": 0.2876821,
"_source": {
"first_name": "jane",
"last_name": "smith",
"age": 32,
"about": "i like to collect rock albums",
"interests": [
"music"
]
}
}
]
}
}
10.全文搜索
找出一個屬性中的獨立單詞是沒有問題的，但有時候想要精確匹配一系列單詞或者短語 。 比如， 我們想執行這樣一個查詢，僅匹配同時包含 “rock” 和 “climbing” ，并且 二者以短語 “rock climbing” 的形式緊挨著的雇員記錄。
get /megacorp/employee/_search
{
"query" : {
"match_phrase" : {
"about" : "rock climbing"
}
}
}返回結果：
{
"took": 142,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.5753642,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 0.5753642,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
}
}
]
}
}11.高亮搜索
許多應用都傾向于在每個搜索結果中 高亮 部分文本片段，以便讓用戶知道為何該文檔符合查詢條件。在 elasticsearch 中檢索出高亮片段也很容易。
增加參數： highlight
get /megacorp/employee/_search
{
"query" : {
"match_phrase" : {
"about" : "rock climbing"
}
},
"highlight": {
"fields" : {
"about" : {}
}
}
}返回結果:
{
"took": 250,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.5753642,
"hits": [
{
"_index": "megacorp",
"_type": "employee",
"_id": "1",
"_score": 0.5753642,
"_source": {
"first_name": "john",
"last_name": "smith",
"age": 25,
"about": "i love to go rock climbing",
"interests": [
"sports",
"music"
]
},
"highlight": {
"about": [
"i love to go <em>rock</em> <em>climbing</em>"
]
}
}
]
}
}其中高亮模塊為highlight屬性
12.分析
elasticsearch 有一個功能叫聚合（aggregations），允許我們基于數據生成一些精細的分析結果。聚合與 sql 中的 group by 類似但更強大。
舉個例子，挖掘出雇員中最受歡迎的興趣愛好：
get /megacorp/employee/_search
{
"aggs": {
"all_interests": {
"terms": { "field": "interests" }
}
}
}返回結果：
{
...
"hits": { ... },
"aggregations": {
"all_interests": {
"buckets": [
{
"key": "music",
"doc_count": 2
},
{
"key": "forestry",
"doc_count": 1
},
{
"key": "sports",
"doc_count": 1
}
]
}
}
}“Centos7安裝ElasticSearch入門實例分析”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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