错误:使用Docker时未找到pg_config可执行文件
问题描述:
我正尝试使用Docker使用Postgres来构建Flask应用程序。我想连接到Postgres的AWS RDS实例,但使用Docker作为我的Flask应用程序。但是,当试图设置psycopg2
时,它会发生错误,因为它找不到pg_config
。这里的错误:错误:使用Docker时未找到pg_config可执行文件
Building api
Step 1/5 : FROM python:3.6.3-alpine3.6
---> 84c98ca3b5c5
Step 2/5 : WORKDIR /usr/src/app
---> Using cache
---> 407c158f5ee4
Step 3/5 : COPY . .
---> 966df18d329e
Step 4/5 : RUN pip install -r requirements.txt
---> Running in 284cc97aeb63
Collecting aniso8601==1.3.0 (from -r requirements.txt (line 1))
Downloading aniso8601-1.3.0.tar.gz (57kB)
Collecting click==6.7 (from -r requirements.txt (line 2))
Downloading click-6.7-py2.py3-none-any.whl (71kB)
Collecting Flask==0.12.2 (from -r requirements.txt (line 3))
Downloading Flask-0.12.2-py2.py3-none-any.whl (83kB)
Collecting Flask-RESTful==0.3.6 (from -r requirements.txt (line 4))
Downloading Flask_RESTful-0.3.6-py2.py3-none-any.whl
Collecting Flask-SQLAlchemy==2.3.2 (from -r requirements.txt (line 5))
Downloading Flask_SQLAlchemy-2.3.2-py2.py3-none-any.whl
Collecting itsdangerous==0.24 (from -r requirements.txt (line 6))
Downloading itsdangerous-0.24.tar.gz (46kB)
Collecting Jinja2==2.9.6 (from -r requirements.txt (line 7))
Downloading Jinja2-2.9.6-py2.py3-none-any.whl (340kB)
Collecting MarkupSafe==1.0 (from -r requirements.txt (line 8))
Downloading MarkupSafe-1.0.tar.gz
Collecting psycopg2==2.7.3.1 (from -r requirements.txt (line 9))
Downloading psycopg2-2.7.3.1.tar.gz (425kB)
Complete output from command python setup.py egg_info:
running egg_info
creating pip-egg-info/psycopg2.egg-info
writing pip-egg-info/psycopg2.egg-info/PKG-INFO
writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
Error: pg_config executable not found.
Please add the directory containing pg_config to the PATH
or specify the full executable path with the option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-01lf5grh/psycopg2/
ERROR: Service 'api' failed to build: The command '/bin/sh -c pip install -r requirements.txt' returned a non-zero code: 1
这里是我的Dockerfile
:
FROM python:3.6.3-alpine3.6
WORKDIR /usr/src/app
COPY . .
RUN pip install -r requirements.txt
CMD ["python", "app.py"]
许多人似乎都在当地一个类似的问题,但他们没有涉及到使用多克。这看起来像一个Docker问题,因为我可以设置一个本地虚拟环境,并且设置工作得很好,因为我已经在本地安装了Postgres,并且能够找到我的本地pg_config
。
看来,在容器的构建/设置过程中,Docker正试图在容器中查找pg_config
。有没有办法在容器中安装pg_config
,即使我不会使用Postgres的容器化实例,而是使用RDS上的实例?
欢迎任何关于如何解决此问题的建议。谢谢!
答
要正常工作,您需要need临时安装的软件包python3-dev gcc musl-dev
以及postgresql-dev
,它具有psycopg2
所需的文件。 postgresql-libs
似乎也做得很好,占用了12 MB的空间,但postgresql-dev
仍然需要构建包。
因为从高山回购安装python3-dev
将依赖安装python3
,我们不妨来一个纯粹的高山3.7图像并手动安装Python 3.6.3(检查package index看什么版本目前)。下面Dockerfile为我工作:
FROM alpine:3.7
WORKDIR /usr/src/app
COPY requirements.txt .
RUN apk update && \
apk add python3 postgresql-libs && \
apk add --virtual .build-deps gcc python3-dev musl-dev postgresql-dev && \
python3 -m pip install -r requirements.txt --no-cache-dir && \
apk --purge del .build-deps
COPY . .
CMD ["python3", "app.py"]
的[PG \ _config可执行文件未找到(https://*.com/questions/11618898/pg-config-executable-not-found) –
这些例子可能重复似乎都涉及本地设置,但不是专门在没有安装Postgres的Docker容器中。 – hidace
Alpine有一个答案(请参阅Dockerfile的第一行):https://*.com/a/44938314/3929826您应该能够抽象出Docker的答案。 –