May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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10.2
クローニングと負荷分散
355
上のコマンドには次のような出力が返ってくるはずです。
Bad Gateway
サービスのインスタンスをいくつか
spawn
すると状況が変わります。たとえば
api-service
を
2
つ
と
webapp-service
をひとつ立ち上げてみましょう。
forever start app.js api-service
forever start app.js api-service
forever start app.js webapp-service
今度はロードバランサが立ち上がったサーバを自動的に見つけてリクエストを分散させ始めるはず
です。次のコマンドをもう一度試してください。
$ curl localhost:8080/api
上のコマンドに対し、今度は次のような応答があるはずです。
$ api-service response from 6972
もう一度実行すると、別のサーバからメッセージを受け取るはずで、リクエストが異なるサーバに均
等に分散されていることが確認できます。
$ api-service response from 6979
このパターンの利点はすぐさま得られます。動的に、オンデマンドで、あるいはスケジュールに基づ
いてスケーリングできるようになったのです。そしてロードバランサは特別な手間なしに、新しい構成
に自動的に適応してくれます。
10.2.5
ピアツーピア負荷分散
複雑な内部ネットワークアーキテクチャをインターネットのような公共のネットワークに公開
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.