Docker Compose 似乎无法读取环境变量

问题描述 投票：0回答：1

这是我的 docker-compose.yml

version: "3"
services:
    db:
        build:
            context: db
        volumes:
            - donazioni-vol:/var/lib/mysql
        env_file:
            - config.env
    generatore:
        build:
            context: generatore
        env_file:
            - config.env
        depends_on:
            - db           
volumes:
    donazioni-vol:

这是我的config.env文件：

MYSQL_USER=dockerdev
MYSQL_PASSWORD=topolino
MYSQL_ROOT_PASSWORD=topolino
MYSQL_DATABASE=solidarieta

这是数据库dockerfile：

FROM mysql:5.7
COPY init-db.sql /docker-entrypoint-initdb.d
RUN chmod 755 /docker-entrypoint-initdb.d/init-db.sql
RUN chmod 755 /docker-entrypoint-initdb.d

这是我想在容器中运行的 MySQL 代码：

USE solidarieta;
CREATE TABLE donazioni(
    id INT AUTO_INCREMENT PRIMARY KEY,
    provincia VARCHAR(2) NOT NULL,
    importo FLOAT
);

INSERT INTO donazioni (provincia, importo) VALUES ('NA', 350);
INSERT INTO donazioni (provincia, importo) VALUES ('TO',75);

这是Python dockerfile：

FROM python:slim
WORKDIR /app
COPY src/script.py .
RUN pip install mysql-connector sqlalchemy
CMD ["python","script.py"]

这是我想在另一个容器中运行的Python代码：

from sqlalchemy import create_engine
from random import choice, randint
import os
import time
engine=create_engine(f"mysql+mysqlconnector://{os.environ['MYSQL_USER']}:{os.environ['MYSQL_PASSWORD']}@db/{os.environ['MYSQL_DATABASE']}")
connection=engine.connect()
province=['NA','TO','RM','FI','GE','MI']
while(True):
    connection.execute(f"INSERT INTO donazioni (provincia, importo) VALUES ('{choice(province)}',{randint(10,300)})")
    time.sleep(5)

当我运行命令

docker-compose up --build -d
时，一切正常并报告以下内容：

Creating volume "solidarieta_donazioni-vol" with default driver
Building db
failed to fetch metadata: fork/exec /usr/local/lib/docker/cli-plugins/docker-buildx: no such file or directory

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  3.072kB
Step 1/4 : FROM mysql:5.7
5.7: Pulling from library/mysql
20e4dcae4c69: Pull complete
1c56c3d4ce74: Pull complete
e9f03a1c24ce: Pull complete
68c3898c2015: Pull complete
6b95a940e7b6: Pull complete
90986bb8de6e: Pull complete
ae71319cb779: Pull complete
ffc89e9dfd88: Pull complete
43d05e938198: Pull complete
064b2d298fba: Pull complete
df9a4d85569b: Pull complete
Digest: sha256:4bc6bc963e6d8443453676cae56536f4b8156d78bae03c0145cbe47c2aad73bb
Status: Downloaded newer image for mysql:5.7
 ---> 5107333e08a8
Step 2/4 : COPY init-db.sql /docker-entrypoint-initdb.d
 ---> e57dc1118bf1
Step 3/4 : RUN chmod 755 /docker-entrypoint-initdb.d/init-db.sql
 ---> Running in 0771c7ccc80a
 ---> Removed intermediate container 0771c7ccc80a
 ---> 37c315ed36e0
Step 4/4 : RUN chmod 755 /docker-entrypoint-initdb.d
 ---> Running in be841d499442
 ---> Removed intermediate container be841d499442
 ---> d7857bc1207c
Successfully built d7857bc1207c
Successfully tagged solidarieta_db:latest
Building generatore
failed to fetch metadata: fork/exec /usr/local/lib/docker/cli-plugins/docker-buildx: no such file or directory

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  3.584kB
Step 1/5 : FROM python:slim
slim: Pulling from library/python
b0a0cf830b12: Pull complete
72914424168c: Pull complete
80818bc858ed: Pull complete
805c2b19c211: Pull complete
7a89e8daeeae: Pull complete
Digest: sha256:2be8daddbb82756f7d1f2c7ece706aadcb284bf6ab6d769ea695cc3ed6016743
Status: Downloaded newer image for python:slim
 ---> f60baedb48a1
Step 2/5 : WORKDIR /app
 ---> Running in fcf03cf2fdf3
 ---> Removed intermediate container fcf03cf2fdf3
 ---> 65ba76a2f856
Step 3/5 : COPY src/script.py .
 ---> 54df5c1db40c
Step 4/5 : RUN pip install mysql-connector sqlalchemy
 ---> Running in 7d2beae9fb67
Collecting mysql-connector
  Downloading mysql-connector-2.2.9.tar.gz (11.9 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 11.9/11.9 MB 2.4 MB/s eta 0:00:00
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Collecting sqlalchemy
  Downloading SQLAlchemy-2.0.30-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (9.6 kB)
Collecting typing-extensions>=4.6.0 (from sqlalchemy)
  Downloading typing_extensions-4.11.0-py3-none-any.whl.metadata (3.0 kB)
Collecting greenlet!=0.4.17 (from sqlalchemy)
  Downloading greenlet-3.0.3-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl.metadata (3.8 kB)
Downloading SQLAlchemy-2.0.30-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (3.2 MB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.2/3.2 MB 2.5 MB/s eta 0:00:00
Downloading greenlet-3.0.3-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (625 kB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 625.7/625.7 kB 1.3 MB/s eta 0:00:00
Downloading typing_extensions-4.11.0-py3-none-any.whl (34 kB)
Building wheels for collected packages: mysql-connector
  Building wheel for mysql-connector (setup.py): started
  Building wheel for mysql-connector (setup.py): finished with status 'done'
  Created wheel for mysql-connector: filename=mysql_connector-2.2.9-cp312-cp312-linux_x86_64.whl size=247951 sha256=732af5d753e0188deb326ac75bd95d0652bc9ffb99609db5efe062b250c6c97b
  Stored in directory: /root/.cache/pip/wheels/03/17/fa/d7604c72dd3dd6d3eb3d249abf36cc532c9a9b4354b8f1bc4f
Successfully built mysql-connector
Installing collected packages: mysql-connector, typing-extensions, greenlet, sqlalchemy
Successfully installed greenlet-3.0.3 mysql-connector-2.2.9 sqlalchemy-2.0.30 typing-extensions-4.11.0
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
 ---> Removed intermediate container 7d2beae9fb67
 ---> cd6517bf66a8
Step 5/5 : CMD ["python","script.py"]
 ---> Running in b752d68b9b05
 ---> Removed intermediate container b752d68b9b05
 ---> 024150ca822f
Successfully built 024150ca822f
Successfully tagged solidarieta_generatore:latest
Creating solidarieta_db_1 ... done
Creating solidarieta_generatore_1 ... done

一切似乎都很好，但是我只发现 db 容器已启动，如果我尝试以交互模式启动 python 容器映像，则会收到以下错误：

Traceback (most recent call last):
  File "/app/script.py", line 5, in <module>
    engine=create_engine(f"mysql+mysqlconnector://{os.environ['MYSQL_USER']}:{os.environ['MYSQL_PASSWORD']}@db/{os.environ['MYSQL_DATABASE']}")
                                                   ~~~~~~~~~~^^^^^^^^^^^^^^
  File "<frozen os>", line 685, in __getitem__
KeyError: 'MYSQL_USER'

就像无法读取环境变量一样。接下来我可以尝试什么？

python docker docker-compose dockerfile python-docker
1个回答
0
投票

当您说以交互模式启动容器时，似乎您没有使用 compose，因此除非您还将 --env-file=config.env 标志传递给 docker run -i ..启动容器的命令。

现在，您的脚本也是在启动时运行的一次性命令，因此它运行然后停止似乎也很正常。

您需要做的是弄清楚该容器中发生了什么。为此，您需要使用 

docker logs solidarieta_generatore_1
。

如果脚本运行并有效，那么您的数据库应该根据需要进行初始化。

要在另一个容器中运行其他客户端代码，只需确保将 --env-file=config.env 标志传递给 docker run 命令即可。

最新问题
© www.soinside.com 2019 - 2024. All rights reserved.