基於ELK搭建MySQL日誌平臺的要點和常見錯誤

第一部分 歸納

ELK是集分佈式數據存儲、可視化查詢和日誌解析於一體的日誌分析平臺。ELK=elasticsearch+Logstash+kibana,三者各司其職,相互配合,共同完成日誌的數據處理工做。ELK各組件的主要功能以下:html

  • elasticsearch,數據存儲以及全文檢索;
  • logstash,日誌加工、「搬運工」;
  • kibana:數據可視化展現和運維管理。

咱們在搭建平臺時,還藉助了filebeat插件。Filebeat是本地文件的日誌數據採集器,可監控日誌目錄或特定日誌文件(tail file),並可將數據轉發給Elasticsearch或Logstatsh等。java

本案例的實踐,主要經過ELK收集、管理、檢索mysql實例的慢查詢日誌和錯誤日誌。node

簡單的數據流程圖以下:mysql

第二部分 elasticsearch

2.1 ES特色和優點

  • 分佈式實時文件存儲,可將每個字段存入索引,使其能夠被檢索到。
  • 實時分析的分佈式搜索引擎。分佈式:索引分拆成多個分片,每一個分片可有零個或多個副本;負載再平衡和路由在大多數狀況下自動完成。
  • 能夠擴展到上百臺服務器,處理PB級別的結構化或非結構化數據。也能夠運行在單臺PC上。
  • 支持插件機制,分詞插件、同步插件、Hadoop插件、可視化插件等。

 2.2 ES主要概念

ES數據庫 MySQL數據庫
Index Database
Tpye[在7.0以後type爲固定值_doc] Table
Document Row
Field Column
Mapping Schema
Everything is indexed Index
Query DSL[Descriptor structure language] SQL
 GET http://... Select * from table …
PUT http://... Update table set …
  • 關係型數據庫中的數據庫(DataBase),等價於ES中的索引(Index);
  • 一個關係型數據庫有N張表(Table),等價於1個索引Index下面有N多類型(Type);
  • 一個數據庫表(Table)下的數據由多行(ROW)多列(column,屬性)組成,等價於1個Type由多個文檔(Document)和多Field組成;
  • 在關係型數據庫裏,schema定義了表、每一個表的字段,還有表和字段之間的關係。 與之對應的,在ES中:Mapping定義索引下的Type的字段處理規則,即索引如何創建、索引類型、是否保存原始索引JSON文檔、是否壓縮原始JSON文檔、是否須要分詞處理、如何進行分詞處理等;
  • 關係型數據庫中的增insert、刪delete、改update、查search操做等價於ES中的增PUT/POST、刪Delete、改_update、查GET.

2.3 執行權限問題

報錯提示linux

[usernimei@testes01 bin]$ Exception in thread "main" org.elasticsearch.bootstrap.BootstrapException: java.nio.file.AccessDeniedException: /data/elasticsearch/elasticsearch-7.4.2/config/elasticsearch.keystore
Likely root cause: java.nio.file.AccessDeniedException: /data/elasticsearch/elasticsearch-7.4.2/config/elasticsearch.keystore
    at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:90)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
    at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:219)
    at java.base/java.nio.file.Files.newByteChannel(Files.java:374)
    at java.base/java.nio.file.Files.newByteChannel(Files.java:425)
    at org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:77)
    at org.elasticsearch.common.settings.KeyStoreWrapper.load(KeyStoreWrapper.java:219)
    at org.elasticsearch.bootstrap.Bootstrap.loadSecureSettings(Bootstrap.java:234)
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:305)
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159)
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150)
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125)
    at org.elasticsearch.cli.Command.main(Command.java:90)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
Refer to the log for complete error details

問題分析sql

第一次誤用了root帳號啓動,此時路徑下的elasticsearch.keystore 權限屬於了root 數據庫

-rw-rw---- 1 root      root        199 Mar 24 17:36 elasticsearch.keystore

解決方案--切換到root用戶修改文件elasticsearch.keystore權限apache

調整到es用戶下,即bootstrap

chown -R es用戶:es用戶組 elasticsearch.keystore

問題2.4 maximum shards open 問題

根據官方解釋,從Elasticsearch v7.0.0 開始,集羣中的每一個節點默認限制 1000 個shard,若是你的es集羣有3個數據節點,那麼最多 3000 shards。這裏咱們是隻有一臺es。因此只有1000。centos

[2019-05-11T11:05:24,650][WARN ][logstash.outputs.elasticsearch][main] Marking url as dead. Last error: [LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError] Elasticsearch Unreachable: [http://qqelastic:xxxxxx@155.155.155.155:55944/][Manticore::SocketTimeout] Read timed out {:url=>http://qqelastic:xxxxxx@155.155.155.155:55944/, :error_message=>"Elasticsearch Unreachable: [http://qqelastic:xxxxxx@155.155.155.155:55944/][Manticore::SocketTimeout] Read timed out", :error_class=>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError"}
[2019-05-11T11:05:24,754][ERROR][logstash.outputs.elasticsearch][main] Attempted to send a bulk request to elasticsearch' but Elasticsearch appears to be unreachable or down! {:error_message=>"Elasticsearch Unreachable: [http://qqelastic:xxxxxx@155.155.155.155:55944/][Manticore::SocketTimeout] Read timed out", :class=>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError", :will_retry_in_seconds=>2}
[2019-05-11T11:05:25,158][WARN ][logstash.outputs.elasticsearch][main] Restored connection to ES instance {:url=>"http://qqelastic:xxxxxx@155.155.155.155:55944/"}
[2019-05-11T11:05:26,763][WARN ][logstash.outputs.elasticsearch][main] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"mysql-error-testqq-2019.05.11", :routing=>nil, :_type=>"_doc"}, #<LogStash::Event:0x65416fce>], :response=>{"index"=>{"_index"=>"mysql-error-qqweixin-2020.05.11", "_type"=>"_doc", "_id"=>nil, "status"=>400, "error"=>{"type"=>"validation_exception", "reason"=>"Validation Failed: 1: this action would add [2] total shards, but this cluster currently has [1000]/[1000] maximum shards open;"}}}}

能夠用Kibana來設置

主要命令:

PUT /_cluster/settings
{
  "transient": {
    "cluster": {
      "max_shards_per_node":10000
    }
  }
}

操做截圖以下:

注意事項:

建議設置後重啓下lostash服務

第三部分 Filebeat

問題3.1  不讀取log文件中的數據

2019-03-23T19:24:41.772+0800    INFO    [monitoring]    log/log.go:145    Non-zero metrics in the last 30s   
{"monitoring": {"metrics": {"beat":{"cpu":{"system":{"ticks":30,"time":{"ms":2}},"total":{"ticks":80,"time":{"ms":4},"value":80},"user":{"ticks":50,"time":{"ms":2}}},"handles":{"limit":{"hard":1000000,"soft":1000000},"open":6},"info":{"ephemeral_id":"a4c61321-ad02-2c64-9624-49fe4356a4e9","uptime":{"ms":210031}},"memstats":{"gc_next":7265376,"memory_alloc":4652416,"memory_total":12084992},"runtime":{"goroutines":16}},"filebeat":{"harvester":{"open_files":0,"running":0}},"libbeat":{"config":{"module":{"running":0}},"pipeline":{"clients":0,"events":{"active":0}}},"registrar":{"states":{"current":0}},"system":{"load":{"1":0,"15":0.05,"5":0.01,"norm":{"1":0,"15":0.0125,"5":0.0025}}}}}}

 修改 filebeat.yml 的配置參數

 問題3.2  多個服務進程

2019-03-27T20:13:22.985+0800    ERROR    logstash/async.go:256    Failed to publish events caused by: write tcp [::1]:48338->[::1]:5044: write: connection reset by peer
2019-03-27T20:13:23.985+0800    INFO    [monitoring]    log/log.go:145    Non-zero metrics in the last 30s    {"monitoring": {"metrics": {"beat":{"cpu":{"system":{"ticks":130,"time":{"ms":11}},"total":{"ticks":280,"time":{"ms":20},"value":280},"user":{"ticks":150,"time":{"ms":9}}},"handles":{"limit":{"hard":65536,"soft":65536},"open":7},"info":{"ephemeral_id":"a02ed909-a7a0-49ee-aff9-5fdab26ecf70","uptime":{"ms":150065}},"memstats":{"gc_next":10532480,"memory_alloc":7439504,"memory_total":19313416,"rss":806912},"runtime":{"goroutines":27}},"filebeat":{"events":{"active":1,"added":1},"harvester":{"open_files":1,"running":1}},"libbeat":{"config":{"module":{"running":0}},"output":{"events":{"batches":1,"failed":1,"total":1},"write":{"errors":1}},"pipeline":{"clients":1,"events":{"active":1,"published":1,"total":1}}},"registrar":{"states":{"current":1}},"system":{"load":{"1":0.05,"15":0.11,"5":0.06,"norm":{"1":0.0063,"15":0.0138,"5":0.0075}}}}}}
2019-03-27T20:13:24.575+0800    ERROR    pipeline/output.go:121    Failed to publish events: write tcp [::1]:48338->[::1]:5044: write: connection reset by peer

緣由是同時有多個logstash進程在運行,關閉重啓

問題3.3  將Filebeat 配置成服務進行管理

filebeat 服務所在路徑:

/etc/systemd/system

編輯filebeat.service文件

[Unit]
Description=filebeat.service
[Service]
User=root
ExecStart=/data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat -e -c /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat.yml
[Install]
WantedBy=multi-user.target

管理服務的相關命令

systemctl start filebeat              #啓動filebeat服務
systemctl enable filebeat             #設置開機自啓動
systemctl disable filebeat            #中止開機自啓動
systemctl status filebeat             #查看服務當前狀態
systemctl restart filebeat           #從新啓動服務
systemctl list-units --type=service        #查看全部已啓動的服務

問題3.4  Filebeat 服務啓動報錯

 注意錯誤

Exiting: error loading config file: yaml: line 29: did not find expected key

主要問題是:filebeat.yml 文件中的格式有破壞,應特別注意修改和新增的地方,對照先後文,驗證格式是否有變化。

問題 3.5 Linux 版本太低,沒法以systemctl管理filebeat服務

此時咱們能夠以service來管理,在目錄init.d下建立一個filebeat.service文件。主要腳本以下:

#!/bin/bash
agent="/data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat"
args="-e -c /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat.yml"
start() {
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
        echo "Starting filebeat: "
       nohup  $agent $args >/dev/null 2>&1 &
        if [ $? == '0' ];then
            echo "start filebeat ok"
        else
            echo "start filebeat failed"
        fi
    else
        echo "filebeat is still running!"
        exit
    fi
}
stop() {
    echo -n $"Stopping filebeat: "
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
echo "filebeat is not running"
    else
        kill $pid
echo "stop filebeat ok"
    fi
}
restart()
 {
    stop
    start
}
status(){
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
        echo "filebeat is not running"
    else
        echo "filebeat is running"
    fi
}
case "$1" in
    start)
        start
    ;;
    stop)
        stop
    ;;
    restart)
        restart
    ;;
    status)
        status
    ;;
    *)
        echo $"Usage: $0 {start|stop|restart|status}"
        exit 1
esac

注意事項

1.文件授予執行權限

chmod 755 filebeat.service

2.設置開機自啓動

chkconfig --add filebeat.service

上面的服務添加自啓動時,會報錯

 解決方案 在 service file的開頭添加如下 兩行

 即修改完善後的代碼以下:

#!/bin/bash

# chkconfig: 2345 10 80 # description: filebeat is a tool for colletct log data

agent="/data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat"
args="-e -c /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat.yml"
start() {
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
        echo "Starting filebeat: "
       nohup  $agent $args >/dev/null?2>&1 &
        if [ $? == '0' ];then
            echo "start filebeat ok"
        else
            echo "start filebeat failed"
        fi
    else
        echo "filebeat is still running!"
        exit
    fi
}
stop() {
    echo -n $"Stopping filebeat: "
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
echo "filebeat is not running"
    else
        kill $pid
echo "stop filebeat ok"
    fi
}
restart()
 {
    stop
    start
}
status(){
    pid=`ps -ef |grep /data/filebeat/filebeat-7.4.2-linux-x86_64/filebeat |grep -v grep |awk '{print $2}'`
    if [ ! "$pid" ];then
        echo "filebeat is not running"
    else
        echo "filebeat is running"
    fi
}
case "$1" in
    start)
        start
    ;;
    stop)
        stop
    ;;
    restart)
        restart
    ;;
    status)
        status
    ;;
    *)
        echo $"Usage: $0 {start|stop|restart|status}"
        exit 1
esac

第四部分 Logstash

問題 4.1 服務化配置

logstash最多見的運行方式即命令行運行./bin/logstash -f logstash.conf啓動,結束命令是ctrl+c。這種方式的優勢在於運行方便,缺點是不便於管理,同時若是遇到服務器重啓,則維護成本會更高一些,若是在生產環境運行logstash推薦使用服務的方式。以服務的方式啓動logstash,同時藉助systemctl的特性實現開機自啓動。

(1)安裝目錄下的config中的startup.options須要修改
修改主要項:
1.服務默認啓動用戶和用戶組爲logstash;能夠修改成root;
2. LS_HOME 參數設置爲 logstash的安裝目錄;例如:/data/logstash/logstash-7.6.0
3. LS_SETTINGS_DIR參數配置爲含有logstash.yml的目錄;例如:/data/logstash/logstash-7.6.0/config
4. LS_OPTS 參數項,添加 logstash.conf 指定項(-f參數);例如:LS_OPTS="--path.settings ${LS_SETTINGS_DIR} -f /data/logstash/logstash-7.6.0/config/logstash.conf"

(2)以root身份執行logstash命令建立服務

 建立服務的命令

安裝目錄/bin/system-install

執行建立命令後,在/etc/systemd/system/目錄中生成了logstash.service 文件

(3)logstash 服務的管理

設置服務自啓動:systemctl enable logstash
啓動服務:systemctl start logstash
中止服務:systemctl stop logstash
重啓服務:systemctl restart logstash
查看服務狀態:systemctl status logstash

問題 4.2 安裝logstash服務需先安裝jdk

報錯提示以下:

 經過查看jave版本,驗證是否已安裝

 

上圖說明沒有安裝。則將安裝包下載(或上傳)至本地,執行安裝

執行安裝命令以下:

yum localinstall jdk-8u211-linux-x64.rpm

 安裝OK,執行驗證

問題 4.3 Linux 版本太低,安裝 logstash 服務失效

問題提示

 查看Linux系統版本

緣由: centos 6.5 不支持 systemctl 管理服務

解決方案

 方案驗證

 相關命令

1.啓動命令
initctl start logstash
2.查看狀態
initctl status logstash

注意事項:

注意如下生成服務的命令仍是要執行的

./system-install 

不然提示錯誤

initctl: Unknown job: logstash

 問題 4.4  配置文件中定義的index name 命名需小寫

"Invalid index name [mysql-error-Test-2019.05.13], must be lowercase", "index_uuid"=>"_na_", "index"=>"mysql-error-Test-2019.05.13"}}}}
May 13 13:36:33 hzvm1996 logstash[123194]: [2019-05-13T13:36:33,907][ERROR][logstash.outputs.elasticsearch][main] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"mysql-slow-Test-2020.05.13", :routing=>nil, :_type=>"_doc"}, #<LogStash::Event:0x1f0aedbc>], :response=>{"index"=>{"_index"=>"mysql-slow-Test-2019.05.13", "_type"=>"_doc", "_id"=>nil, "status"=>400, "error"=>{"type"=>"invalid_index_name_exception", "reason"=>"Invalid index name [mysql-slow-Test-2019.05.13], must be lowercase", "index_uuid"=>"_na_", "index"=>"mysql-slow-Test-2019.05.13"}}}}
May 13 13:38:50 hzvm1996 logstash[123194]: [2019-05-13T13:38:50,765][ERROR][logstash.outputs.elasticsearch][main] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"mysql-error-Test-2020.05.13", :routing=>nil, :_type=>"_doc"}, #<LogStash::Event:0x4bdce1db>], :response=>{"index"=>{"_index"=>"mysql-error-Test-2019.05.13", "_type"=>"_doc", "_id"=>nil, "status"=>400, "error"=>{"type"=>"invalid_index_name_exception", "reason"=>"Invalid index name [mysql-error-Test-2019.05.13], must be lowercase", "index_uuid"=>"_na_", "index"=>"mysql-error-Test-2019.05.13"}}}}

第五部分 kibana

問題5.1 開啓密碼認證

[root@testkibaba bin]# ./kibana-plugin install x-pack
Plugin installation was unsuccessful due to error "Kibana now contains X-Pack by default, there is no longer any need to install it as it is already present.

說明:新版本的Elasticsearch和Kibana都已經支持自帶支持x-pack了,不須要進行顯式安裝。老版本的須要進行安裝。

問題5.2 應用啓動報錯

[root@testkibana bin]# ./kibana

報錯

Kibana should not be run as root.  Use --allow-root to continue.

添加個專門的帳號

useradd qqweixinkibaba --添加帳號
chown -R qqweixinkibaba:hzdbakibaba kibana-7.4.2-linux-x86_64 --爲新增帳號賦予文檔目錄的權限
su qqweixinkibaba ---切換帳號,讓後再啓動

問題5.3 登入kibana報錯

{"statusCode":403,"error":"Forbidden","message":"Forbidden"} 

報錯緣由是:用kibana帳號登陸kibana報錯,改成elastic用戶就好了

問題5.4 多租戶實現的問題

一個公司會有多個業務線,也可能會有多個研發小組,那麼如何實現收集到的數據只對相應的團隊開放呢?即實現只能看到自家的數據。一種思路就是搭建多個ELK,一個業務線一個ELK,但這個方法會致使資源浪費和增長運維工做量;另外一種思路就是經過多租戶來實現。

實現時,應注意如下問題:

要在 elastic 帳號下,轉到指定的空間(space)下,再設置 index pattern 。

 

 先建立role(注意與space關聯),最後建立user。

參考資料

1.https://www.jianshu.com/p/0a5acf831409 《ELK應用之Filebeat》 

2.http://www.voidcn.com/article/p-nlietamt-zh.html 《filebeat 啓動腳本》

3.https://www.bilibili.com/video/av68523257/?redirectFrom=h5 《ElasticTalk #22 Kibana 多租戶介紹與實戰》

4.http://www.javashuo.com/article/p-ehivawqt-hv.html 《ES集羣》

5.https://www.jianshu.com/p/54cdddf89989 《Logstash配置以服務方式運行》

6.https://www.elastic.co/guide/en/logstash/current/running-logstash.html#running-logstash-upstart 《Running Logstash as a Service on Debian or RPM》

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