ALB (Application Load Balancer) 支援對 Host 的分流了

大概是有時候 cluster 太小,ELB 或是 ALB 的費用反而比 cluster 還貴,再加上 ALB 提供起來算方便,所以就推出這樣的功能了:「New – Host-Based Routing Support for AWS Application Load Balancers」。

現在可以針對 Host 欄位決定導到不同的 cluster 上了:

然後讓 ALB 可以設的 rule 數量增加:

As part of today’s launch we are raising the maximum number of rules per Application Load Balancer from 10 to 75, and also introducing a new rule editor.

這個功能有種微妙的感覺 XDDD

AWS 正式進入 IPv6 的世界

AWS 總算是進入全面支援 IPv6 了:「AWS IPv6 Update – Global Support Spanning 15 Regions & Multiple AWS Services」。

之前不少服務都支援了,主要是差 EC2 與新出的 ALB,這一次大量服務都上了 IPv6 (但還不是全部),算是讓 AWS 正式進入 IPv6 的世界:

Today I am happy to share the news that IPv6 support for EC2 instances in VPCs is now available in a total of fifteen regions, along with Application Load Balancer support for IPv6 in nine of those regions.

AWS 的 ALB (Application Load Balancer)

前幾天跟 AWS 的人開會的時候得知 ALB 的 beta program,今天就看到正式公開的消息了:「New – AWS Application Load Balancer」。

最主要的是對 WebSockets 與 HTTP/2 的支援,這個需求都喊很久了:

WebSocket allows you to set up long-standing TCP connections between your client and your server. This is a more efficient alternative to the old-school method which involved HTTP connections that were held open with a “heartbeat” for very long periods of time. WebSocket is great for mobile devices and can be used to deliver stock quotes, sports scores, and other dynamic data while minimizing power consumption. ALB provides native support for WebSocket via the ws:// and wss:// protocols.

HTTP/2 is a significant enhancement of the original HTTP 1.1 protocol. The newer protocol feature supports multiplexed requests across a single connection. This reduces network traffic, as does the binary nature of the protocol.

另外是 url routing,不過目前看起來只能設 10 條,我猜可以問問能不能加吧:

An Application Load Balancer has access to HTTP headers and allows you to route requests to different backend services accordingly. For example, you might want to send requests that include /api in the URL path to one group of servers (we call these target groups) and requests that include /mobile to another. Routing requests in this fashion allows you to build applications that are composed of multiple microservices that can run and be scaled independently.

As you will see in a moment, each Application Load Balancer allows you to define up to 10 URL-based rules to route requests to target groups. Over time, we plan to give you access to other routing methods.

再來是改善了之前抱怨很多的 health check:

Application Load Balancers can perform and report on health checks on a per-port basis. The health checks can specify a range of acceptable HTTP responses, and are accompanied by detailed error codes.

改進了不少東西...