Application Load Balancer

## Application Load Balancer とは
[https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/introduction.html](https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/introduction.html)

## ロードバランサーの属性
[https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/application-load-balancers.html#load-balancer-attributes](https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/application-load-balancers.html#load-balancer-attributes)

## ログフィールド
[https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-access-logs.html](https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-access-logs.html)

## メトリクス
[https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html](https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html)

## Application Load Balancer のトラブルシューティング
[https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-troubleshooting.html](https://docs.aws.amazon.com/ja_jp/elasticloadbalancing/latest/application/load-balancer-troubleshooting.html)

## HTTP 504: Gateway Timeout
> **発生事例**  

> **関連属性: idle_timeout.timeout_seconds**  
idle_timeout.timeout_seconds  
アイドルタイムアウト値(秒単位)。デフォルト値は60秒。