docker-composeでDjango+MySQLの環境を作りたい

docker-composeでDjango+MySQLの環境を作るため以下のDockerfileとdocker-composeを作成しました。
その後docker-compose upを行うとdb側は立ち上がるのですがweb側はCommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False. とエラーが出てうまく立ち上がりません。

Djangoのsettings.pyでALLOWED_HOSTS = ['*']としてもうまくいきませんでした。どうすればよろしいでしょうか。

Dockerfile

Dockerfile
1FROM python:3.9
2ENV PYTHONUNBUFFERED 1
3RUN mkdir /code
4WORKDIR /code
5ADD requirements.txt /code/
6RUN pip install --upgrade pip
7RUN pip install -r requirements.txt
8ADD . /code/

docker-compose.yml

yaml
1version: '3'
2
3services:
4  db:
5    image: mysql
6    env_file:
7      - ./.vscode/.env
8
9  web:
10    build: .
11    command: python3 manage.py runserver 0.0.0.0:8000
12    volumes:
13      - .:/code
14    ports:
15      - "8000:8000"
16    depends_on:
17      - db

出力結果

db_1   | 2022-08-29 13:08:28+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1   | 2022-08-29 13:08:29+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db_1   | 2022-08-29 13:08:29+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1   | '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock'
db_1   | 2022-08-29T13:08:29.805758Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1   | 2022-08-29T13:08:29.807234Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 1
db_1   | 2022-08-29T13:08:29.815036Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1   | 2022-08-29T13:08:30.333148Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1   | 2022-08-29T13:08:30.467808Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
db_1   | 2022-08-29T13:08:30.526247Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
db_1   | 2022-08-29T13:08:30.573352Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1   | 2022-08-29T13:08:30.573407Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1   | 2022-08-29T13:08:30.575009Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
db_1   | 2022-08-29T13:08:30.596703Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server - GPL.
db_1   | 2022-08-29T13:08:30.597104Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
db_1   | 2022-08-29 13:17:16+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1   | 2022-08-29 13:17:16+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
db_1   | 2022-08-29 13:17:17+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.30-1.el8 started.
db_1   | '/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock'
db_1   | 2022-08-29T13:17:17.551676Z 0 [Warning] [MY-011068] [Server] The syntax '--skip-host-cache' is deprecated and will be removed in a future release. Please use SET GLOBAL host_cache_size=0 instead.
db_1   | 2022-08-29T13:17:17.553050Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.30) starting as process 1
db_1   | 2022-08-29T13:17:17.565245Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
db_1   | 2022-08-29T13:17:18.020379Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
db_1   | 2022-08-29T13:17:18.148925Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
db_1   | 2022-08-29T13:17:18.157516Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
db_1   | 2022-08-29T13:17:18.207169Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
db_1   | 2022-08-29T13:17:18.207223Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
db_1   | 2022-08-29T13:17:18.209375Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
db_1   | 2022-08-29T13:17:18.230643Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.30'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server - GPL.
db_1   | 2022-08-29T13:17:18.230649Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
web_1  | CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False.
associating_game_web_1 exited with code 1

tomi2904

2022/08/30 05:39

`python3 manage.py runserver 0.0.0.0:8000` のコマンドで`CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False.`となってしまっているようです。

rykss

2022/09/04 08:44

setting.pyのコードを載せてもらえると回答できる方がいらっしゃるかもしれませんよかったら載せてくださいね完全に予想なのですがALLOWED_HOSTSの位置が悪いかもしれません。（空リストで再定義されているなど…）

tomi2904

2022/09/04 12:19

解答ありがとうございます。原因はweb側に.envのパスを記述していないがために、名前を変えてしまったsettings.pyが読み込めずエラーになるというものでした。お手数おかけしました。

行動規範の内容に同意します

回答1件

自己解決

web側のコンテナにもenv_fileのパスを記述する必要があった

原因はwebの方にenv_fileのパスを記述していなかったためでした。デフォルトだとsettings.pyが読み込まれるため特に意識する必要はないのですが、私はsettings.pyの名前を別の名前に変更しており、その変更を.envで処理するようにしていたところ、web側で.envの環境変数を読み込めずsettings.pyも読めずエラーになるという具合でした。

解答していただいた方ありがとうございました。

yaml
1version: '3'
2
3services:
4  db:
5    image: mysql
6    env_file: ./.vscode/.env
7 
8  web:
9    env_file: ./.vscode/.env  # この1行を追加したら動きました
10    build: .
11    command: python manage.py runserver 0.0.0.0:8000
12    volumes:
13      - .:/code
14    ports:
15      - "8000:8000"
16    depends_on:
17      - db