Related Posts
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L4 장비의 동작과 서비스 배포시 유의점
2014.05.30
개요 현재 카카오에서 대부분의 웹서버는 L3DSR (Direct Server Return)구성의 L7 HealthCheck 방식을 사용 중입니다. L7 HealthCheck 방식은 앞서 블로그에서 기술한적이 있는 것처럼 OSI 7Layer 중 Layer7 계층의 어플리케이션 응답을 체크하는 방식입니다. 카카오에서는 L4장비가 주기적으로 서버와 TCP 세션을 맺고 GET /health_check.html 의 Request로 응답코드를 확인 하는 방식입니다. 그러나 최근 여러개의 서비스에서 HTTP Keep-Alive 를 사용중이고 이에 […]
terry.k -
kakao의 L3DSR 구성 사례
2014.05.28
Overview 서비스 웹서버 Load Balancing을 위한 메커니즘으로 KAKAO에서는 L3DSR 방식을 사용하고 있습니다. 멀티IDC에서 L3DSR 방식을 활용, IDC 위치나 서버의 물리적인 위치에 따른 제한없이 서비스 웹서버 Load Balancing이 가능하도록 구성하고 있습니다. L3DSR 소개 보통 서비스에서는 Inbound traffic 대비 Outbound traffic이 월등히 높은데 Outbound traffic을 SLB에서 모두 수용하게 될 경우 리소스 소모가 커질 수 밖에 없습니다. 그래서 […]
terry.k
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