问题
I'm trying to connect a pyodbc python script running in a docker container to login to a MSSQL database I have tried all sorts of docker files, but not been able to make the connection (fails when bulding the docker or when python tries to connect), Does anyone have a working dockerfile, using pyodbc:
Dockerfile:
# Use an official Python runtime as a parent image
FROM python:2.7-slim
# Set the working directory to /app
WORKDIR /app
# Copy the current directory contents into the container at /app
ADD . /app
# Install any needed packages specified in requirements.txt
RUN pip install -r requirements.txt
# Run app.py when the container launches
CMD ["python", "App.py"]
requirements.TXT
pyodbc
App.Py
import pyodbc
connection = pyodbc.connect('Driver={SQL Server};'
'Server=xxxx;'
'Database=xxx;'
'UID=xxxx;'
'PWD=xxxx')
cursor = connection.cursor()
cursor.execute("SELECT [Id],[Name] FROM [DCMM].[config].[Models]")
for row in cursor.fetchall():
print(row.Name)
connection.close()
Bulding the container docker build -t sqltest .
Output:
Sending build context to Docker daemon 4.096kB
Step 1/5 : FROM python:2.7-slim
---> 426d65ab9a72
Step 2/5 : WORKDIR /app
---> Using cache
---> 725f35122880
Step 3/5 : ADD . /app
---> 3feb8b7744f7
Removing intermediate container 4214091a111a
Step 4/5 : RUN pip install -r requirements.txt
---> Running in 27aa4dcfe738
Collecting pyodbc (from -r requirements.txt (line 1))
Downloading pyodbc-4.0.17.tar.gz (196kB)
Building wheels for collected packages: pyodbc
Running setup.py bdist_wheel for pyodbc: started
Running setup.py bdist_wheel for pyodbc: finished with status 'error'
Failed building wheel for pyodbc
Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-EfWsmy/pyodbc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpa3S13tpip-wheel- --python-tag cp27:
running bdist_wheel
running build
running build_ext
building 'pyodbc' extension
creating build
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/src
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DPYODBC_VERSION=4.0.17 -DSQL_WCHART_CONVERT=1 -I/usr/local/include/python2.7 -c src/cursor.cpp -o build/temp.linux-x86_64-2.7/src/cursor.o -Wno-write-strings
unable to execute 'gcc': No such file or directory
error: command 'gcc' failed with exit status 1
----------------------------------------
Running setup.py clean for pyodbc
Failed to build pyodbc
Installing collected packages: pyodbc
Running setup.py install for pyodbc: started
Running setup.py install for pyodbc: finished with status 'error'
Complete output from command /usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-EfWsmy/pyodbc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-BV4sRM-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
building 'pyodbc' extension
creating build
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/src
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DPYODBC_VERSION=4.0.17 -DSQL_WCHART_CONVERT=1 -I/usr/local/include/python2.7 -c src/cursor.cpp -o build/temp.linux-x86_64-2.7/src/cursor.o -Wno-write-strings
unable to execute 'gcc': No such file or directory
error: command 'gcc' failed with exit status 1
----------------------------------------
Command "/usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-EfWsmy/pyodbc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-BV4sRM-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-EfWsmy/pyodbc/
The command '/bin/sh -c pip install -r requirements.txt' returned a non-zero code: 1
回答1:
Need to Run:
sudo apt-get install gcc
need to add a odbcinst.ini file containing:
[FreeTDS]Description=FreeTDS Driver Driver=/usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so Setup=/usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
need to add folowing to docker file
ADD odbcinst.ini /etc/odbcinst.ini
RUN apt-get update
RUN apt-get install -y tdsodbc unixodbc-dev
RUN apt install unixodbc-bin -y
RUN apt-get clean -y
need to change connection in .py to
connection = pyodbc.connect('Driver={FreeTDS};'
'Server=xxxxx;'
'Database=DCMM;'
'UID=xxxxx;'
'PWD=xxxxx')
Now the container compiles, and gets data from SQL server
回答2:
Based on Kåre Rasmussen's answer, here's a complete dockerfile for further use.
Make sure to edit the last two lines according to your architecture! They should reflect the actual paths to libtdsodbc.so and libtdsS.so.
If you're not sure about the paths to libtdsodbc.so and libtdsS.so, try dpkg --search libtdsodbc.so and dpkg --search libtdsS.so.
FROM python:3
#Install FreeTDS and dependencies for PyODBC
RUN apt-get update && apt-get install -y tdsodbc unixodbc-dev \
&& apt install unixodbc-bin -y \
&& apt-get clean -y
RUN echo "[FreeTDS]\n\
Description = FreeTDS unixODBC Driver\n\
Driver = /usr/lib/arm-linux-gnueabi/odbc/libtdsodbc.so\n\
Setup = /usr/lib/arm-linux-gnueabi/odbc/libtdsS.so" >> /etc/odbcinst.ini
Afterwards, install PyODBC, COPY your app and run it.
回答3:
Running through this recently I found it was necessary to additionally include the following line (note that it did not build without this step):
RUN apt-get install --reinstall build-essential -y
The full Dockerfile looks as follows:
# parent image
FROM python:3.7-slim
# install FreeTDS
RUN apt-get update
RUN apt-get install unixodbc -y
RUN apt-get install unixodbc-dev -y
RUN apt-get install freetds-dev -y
RUN apt-get install freetds-bin -y
RUN apt-get install tdsodbc -y
RUN apt-get install --reinstall build-essential -y
# populate "ocbdinst.ini"
RUN echo "[FreeTDS]\n\
Description = FreeTDS unixODBC Driver\n\
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so\n\
Setup = /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so" >> /etc/odbcinst.ini
# install pyodbc
RUN pip install --trusted-host pypi.python.org pyodbc==4.0.26
# run app.py upon container launch
CMD ["python", "app.py"]
来源：https://stackoverflow.com/questions/46405777/connect-docker-python-to-sql-server-with-pyodbc