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              負載均衡軟件HAProxy有哪些優點?【Linux學習每日一個知識點64期】

              如果你剛學linux,你一定還不可能接觸到HAProxy,但是作為負載均衡的重要軟件,是學習Linux運維及云計算必學的一個軟件,今天我們來看看HAProxy,看一看用它有什么優勢。

              【64期主題】負載均衡軟件HAProxy有哪些優點?

              HAProxy是一個使用C語言編寫的自由及開放源代碼軟件[1],其提供高可用性、負載均衡,以及基于TCP和HTTP的應用程序代理。
              HAProxy特別適用于那些負載特大的web站點,這些站點通常又需要會話保持或七層處理。HAProxy運行在當前的硬件上,完全可以支持數以萬計的并發連接。并且它的運行模式使得它可以很簡單安全的整合進您當前的架構中, 同時可以保護你的web服務器不被暴露到網絡上。

              HAProxy的特點是:
              1、HAProxy也是支持虛擬主機的。
              2、HAProxy的優點能夠補充Nginx的一些缺點,比如支持Session的保持,Cookie的引導;同時支持通過獲取指定的url來檢測后端服務器的狀態。
              3、HAProxy跟LVS類似,本身就只是一款負載均衡軟件;單純從效率上來講HAProxy會比Nginx有更出色的負載均衡速度,在并發處理上也是優于Nginx的。
              4、HAProxy支持TCP協議的負載均衡轉發,可以對MySQL讀進行負載均衡,對后端的MySQL節點進行檢測和負載均衡,大家可以用LVS+Keepalived對MySQL主從做負載均衡。
              5、HAProxy負載均衡策略非常多,HAProxy的負載均衡算法現在具體有如下8種:
              ① roundrobin,表示簡單的輪詢,這個不多說,這個是負載均衡基本都具備的;
              ② static-rr,表示根據權重,建議關注;
              ③ leastconn,表示最少連接者先處理,建議關注;
              ④ source,表示根據請求源IP,這個跟Nginx的IP_hash機制類似,我們用其作為解決session問題的一種方法,建議關注;
              ⑤ ri,表示根據請求的URI;
              ⑥ rl_param,表示根據請求的URl參數’balance url_param’ requires an URL parameter name;
              ⑦ hdr(name),表示根據HTTP請求頭來鎖定每一次HTTP請求;
              ⑧ rdp-cookie(name),表示根據據cookie(name)來鎖定并哈希每一次TCP請求。

               

              【更多擴展閱讀】Linux基礎教程之Nginx/LVS/HAProxy對比分析


              《Linux學習每日一個知識點》欄目是馬哥教育Linux云計算年薪20萬+的學員社群特別發起,分享Linux工具、Linux語法、Linux項目等知識點,幫助大家快速的了解Linux學習,快速步入Linux高薪的快車道。


              【超全整理】《Linux云計算從入門到精通》linux學習入門教程系列實戰筆記全放送

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