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Docker + create-react-app v3.4.1でサーバーが立ち上がらない

Last updated at Posted at 2020-03-28

起きたバグ

react-scripts startでサーバーを立ち上げようとしても

node_1  | yarn run v1.22.4
node_1  | $ react-scripts start
node_1  | ℹ 「wds」: Project is running at http://172.26.0.2/
node_1  | ℹ 「wds」: webpack output is served from 
node_1  | ℹ 「wds」: Content not from webpack is served from /usr/src/app/react-sample/public
node_1  | ℹ 「wds」: 404s will fallback to /
node_1  | Starting the development server...
node_1  | 
node_1  | Done in 25.46s.
docker-react-app_node_1 exited with code 0

というメッセージが表示されサーバーが終了する。

原因

create-react-app v3.4.1で取り込まれた下記の修正

process.stdout.isTTYかprocess.env.CIがtrueじゃないと開発用サーバーが停止するらしい。

解決方法

上のコミットのメッセージに

// Gracefully exit when stdin ends
(標準入力が終了したら正常終了するよ)

とあるので標準入力を終わらせないオプションをdocker-compose.ymlに追加。
具体的には下記のオプション

stdin_open: true

と追加するだけ。

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