Application Gateway on Azure

Application Gateway는 Region 단위 서비스다.

 

Q) 왜 X피카의 경우 AGW마다 RG를 새롭게 만들어뒀을까?

AGW는 사실 밑단에서는 여러 대의 Gateway instance로 이루어지고, Auto-scaling을 걸 수 있다.

근데 각각의 Gateway instance가 IP를 갖기 때문에, vNet-Subnet에 배포해야된다.

사실.. RG는 새롭게 만들 필요 없고, vNet만 새로 만들어서 거기에 배포해도 되지만

그냥 관리의 용이성 때문에 RG를 새로 만든게 아닐까.... 글쎄....

 

https://docs.microsoft.com/ko-kr/azure/application-gateway/high-traffic-support

근데 내가 궁금했던, 극도로 High-Volume Traffic이 AGW에 몰려서 AGW 자체가 다운되는걸 방지하기 위한 AGW 로드밸런싱 내용은 없네. 생각보다 하나의 AGW가 엄청 많이 버틸 수 있든가 (어차피 auto scaling이니깐)

애초에 동접자가 그렇게 수천만 수억명이면 서비스에 따라 AGW를 따로 분리하라는 뜻 같다.

 

 

참고) 하나의 서브넷에 두 개의 AGW를 넣으면 어떻게 될까?

http://dwingul.com/azure-application-gateway-with-network-security-group/

Azure Application Gateway NSG로 ACL하기

결론)

 

 

https://docs.microsoft.com/en-us/azure/application-gateway/overview

What is Azure Application Gateway

Application Gateway can make routing decisions based on additional attributes of an HTTP request, for example URI path or host headers. For example, you can route traffic based on the incoming URL. So if /images is in the incoming URL, you can route traffic to a specific set of servers (known as a pool) configured for images. If /video is in the URL, that traffic is routed to another pool that's optimized for videos.

 

 Note

Azure provides a suite of fully managed load-balancing solutions for your scenarios.

• If you are looking to do DNS based global routing and do not have requirements for Transport Layer Security (TLS) protocol termination ("SSL offload"), per-HTTP/HTTPS request or application-layer processing, review Traffic Manager.
• If you need to optimize global routing of your web traffic and optimize top-tier end-user performance and reliability through quick global failover, see Front Door.
• To do network layer load balancing, review Load Balancer.

Your end-to-end scenarios may benefit from combining these solutions as needed. For an Azure load-balancing options comparison, see Overview of load-balancing options in Azure.

 

https://docs.microsoft.com/ko-kr/azure/application-gateway/multiple-site-overview