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    幫助中心 > 網絡與加速 > 負載均衡SLB > 快速入門 > 健康檢查概述

    健康檢查概述

    負載均衡通過健康檢查來判斷后端服務器(ECS實例)的業務可用性。健康檢查機制提高了前端業務整體可用性,避免了后端ECS異常對總體服務的影響。

    開啟健康檢查功能后,當后端某臺ECS健康檢查出現異常時,負載均衡會自動將新的請求分發到其它健康檢查正常的ECS上;而當該ECS恢復正常運行時,負載均衡會將其自動恢復到負載均衡服務中。

    如果您的業務對負載敏感性高,高頻率的健康檢查探測可能會對正常業務訪問造成影響。您可以結合業務情況,通過降低健康檢查頻率、增大健康檢查間隔、七層檢查修改為四層檢查等方式,來降低對業務的影響。但為了保障業務的持續可用,不建議關閉健康檢查。

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