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Route53加重ルーティング応用

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AWSドキュメント
https://docs.aws.amazon.com/ja_jp/Route53/latest/DeveloperGuide/routing-policy-weighted.html

[現状]
社外のDNS -> CNAME① -> オンプレ環境のサーバ①
external.company.jp -> internal1.excite.co.jp -> オンプレサーバ①

[移行手順]
1.新しい社内サブドメイン -> Route53 CNAME② -> オンプレサーバ①
internal2.excite.co.jp -> オンプレサーバ①

2.AWS環境で新しいAWSサーバ②構築
internal2.excite.co.jp -> AWSサーバ②

3.加重ルーティング設定
internal2.excite.co.jp -> オンプレサーバ① : 0
internal2.excite.co.jp -> AWSサーバ② : 100

4.必要なテスト実施

5.加重ルーティング設定
internal2.excite.co.jp -> オンプレサーバ① : 100
internal2.excite.co.jp -> AWSサーバ② : 0

6.社外のDNS -> Route53 CNAME② -> オンプレ環境のサーバ①
external.company.jp -> internal2.excite.co.jp -> オンプレサーバ①

7.加重ルーティング設定(本番的にDNS切り替え)
external.company.jp -> internal2.excite.co.jp -> AWSサーバ②
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