FastAPI + Alembic + Docker cant detect database url env variable
I have a fastapi project that uses alembic and loads the env variables using pydantic_settings. My build always fails saying it cant find "SERVICE_DATABASE_URL" which is my db url. below is my dockerfile
FROM python:3.11
WORKDIR /app
COPY . /app
RUN pip install --no-cache-dir -r requirements.txt
EXPOSE 8001
ARG SERVICE_DATABASE_URL
RUN echo $SERVICE_DATABASE_URL
RUN alembic upgrade head
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8001"]
FROM python:3.11
WORKDIR /app
COPY . /app
RUN pip install --no-cache-dir -r requirements.txt
EXPOSE 8001
ARG SERVICE_DATABASE_URL
RUN echo $SERVICE_DATABASE_URL
RUN alembic upgrade head
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8001"]
4 Replies
Project ID:
eff98eea-4f33-41b5-be10-86353122045ceff98eea-4f33-41b5-be10-86353122045c
error
#10 ERROR: process "/bin/sh -c alembic upgrade head" did not complete successfully: exit code: 1
-----
> [6/6] RUN alembic upgrade head:
0.874 settings = Configuration()
0.874 ^^^^^^^^^^^^^^^
0.874 File "/usr/local/lib/python3.11/site-packages/pydantic_settings/main.py", line 71, in __init__
0.874 super().__init__(
0.874 File "/usr/local/lib/python3.11/site-packages/pydantic/main.py", line 165, in __init__
0.875 __pydantic_self__.__pydantic_validator__.validate_python(data, self_instance=__pydantic_self__)
0.875 pydantic_core._pydantic_core.ValidationError: 1 validation error for Configuration
0.875 SERVICE_DATABASE_URL
0.875 Input should be a valid string [type=string_type, input_value=None, input_type=NoneType]
0.875 For further information visit https://errors.pydantic.dev/2.3/v/string_type
-----
Dockerfile:16
-------------------
14 | ENV SERRVICE_DATABASE_URL = ${SERRVICE_DATABASE_URL}
15 |
16 | >>> RUN alembic upgrade head
17 |
18 | CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8001"]
-------------------
ERROR: failed to solve: process "/bin/sh -c alembic upgrade head" did not complete successfully: exit code: 1
#10 ERROR: process "/bin/sh -c alembic upgrade head" did not complete successfully: exit code: 1
-----
> [6/6] RUN alembic upgrade head:
0.874 settings = Configuration()
0.874 ^^^^^^^^^^^^^^^
0.874 File "/usr/local/lib/python3.11/site-packages/pydantic_settings/main.py", line 71, in __init__
0.874 super().__init__(
0.874 File "/usr/local/lib/python3.11/site-packages/pydantic/main.py", line 165, in __init__
0.875 __pydantic_self__.__pydantic_validator__.validate_python(data, self_instance=__pydantic_self__)
0.875 pydantic_core._pydantic_core.ValidationError: 1 validation error for Configuration
0.875 SERVICE_DATABASE_URL
0.875 Input should be a valid string [type=string_type, input_value=None, input_type=NoneType]
0.875 For further information visit https://errors.pydantic.dev/2.3/v/string_type
-----
Dockerfile:16
-------------------
14 | ENV SERRVICE_DATABASE_URL = ${SERRVICE_DATABASE_URL}
15 |
16 | >>> RUN alembic upgrade head
17 |
18 | CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8001"]
-------------------
ERROR: failed to solve: process "/bin/sh -c alembic upgrade head" did not complete successfully: exit code: 1
do you have the applicable service variable set on your service?
yes, no worries i fixed it
FROM python:3.11
WORKDIR /app
COPY . /app
RUN pip install --no-cache -r requirements.txt
EXPOSE 8002
ARG SERVICE_DATABASE_URL
RUN echo $SERVICE_DATABASE_URL
"ENV SERVICE_DATABASE_URL=$SERVICE_DATABASE_URL" <===== HERE
RUN alembic upgrade head
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8002"]
FROM python:3.11
WORKDIR /app
COPY . /app
RUN pip install --no-cache -r requirements.txt
EXPOSE 8002
ARG SERVICE_DATABASE_URL
RUN echo $SERVICE_DATABASE_URL
"ENV SERVICE_DATABASE_URL=$SERVICE_DATABASE_URL" <===== HERE
RUN alembic upgrade head
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8002"]