I'm trying to connect to an Oracle database at my company through my docker container that contains some of my python scripts with the package cx_Oracle. After i build and run the container, i get the following error:
conn = cx_Oracle.connect("{0}/{1}@{2}".format(configOracle["username"], configOracle["password"],r"ed03:1521/configOracle["servername"]))
cx_Oracle.DatabaseError: DPI-1047: Cannot locate a 64-bit Oracle Client library: "libclntsh.so: cannot open shared object file: No such file or directory". See https://oracle.github.io/odpi/doc/installation.html#linux for help
I have an Oracle config file where the username, password, and server name are coming from and being filled in correctly. I can't seem to get it to work even after downloading the latest client from https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html .
My directory structure looks like this:
--TopDirectory
----instantclient
-------instantclient-basic-linux.x64-19.5.0.0.0dbru.zip
-------instantclient-sdk-linux.x64-19.5.0.0.0dbru.zip
----hello_oracle.py
----Dockerfile
----requirements.txt
----configOracle.json
Here is my Dockerfile:
FROM python:3.7.5
#Oracle Client setup
ENV ORACLE_HOME /opt/oracle/instantclient_19_5
ENV LD_RUN_PATH=$ORACLE_HOME
COPY instantclient/* /tmp/
RUN \
mkdir -p /opt/oracle && \
unzip "/tmp/instantclient*.zip" -d /opt/oracle && \
ln -s $ORACLE_HOME/libclntsh.so.19.1 $ORACLE_HOME/libclntsh.so
# Working directory
WORKDIR /src
# Copying requirements.txt before entire build step
COPY requirements.txt /src/requirements.txt
RUN pip install --upgrade pip
# Installing necessary packages
RUN pip install -r requirements.txt
# Copying rest of files
COPY . /src
CMD ["python3", "/src/hello_oracle.py"]
Here is my requirements.txt file:
pandas
numpy
matplotlib
keras
cx_Oracle
sklearn
tensorflow
pyopenssl
ndg-httpsclient
pyasn1
After many hours trying it, I finally solved it with this Dockerfile
Note I am using python 3.7, Django 3.0, Oracle Database 12c and Pipenv for package management
FROM python:3.7.5-slim-buster
# Installing Oracle instant client
WORKDIR /opt/oracle
RUN apt-get update && apt-get install -y libaio1 wget unzip \
&& wget https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip \
&& unzip instantclient-basiclite-linuxx64.zip \
&& rm -f instantclient-basiclite-linuxx64.zip \
&& cd /opt/oracle/instantclient* \
&& rm -f *jdbc* *occi* *mysql* *README *jar uidrvci genezi adrci \
&& echo /opt/oracle/instantclient* > /etc/ld.so.conf.d/oracle-instantclient.conf \
&& ldconfig
WORKDIR /app
COPY . . # Copy my project folder content into /app container directory
RUN pip3 install pipenv
RUN pipenv install
EXPOSE 8000
# For this statement to work you need to add the next two lines into Pipfilefile
# [scripts]
# server = "python manage.py runserver 0.0.0.0:8000"
ENTRYPOINT ["pipenv", "run", "server"]
The latest release of the Python driver for Oracle got renamed to python-oracledb and is now a 'thin' driver by default. It does not need Instant Client - it's optional. See the release announcement . The Dockerfile can simply be like:
FROM python:3.10-bullseye
RUN python -m pip install oracledb
If you want the option to use the 'Thick' mode of python-oracledb, then you could use a Dockerfile like:
FROM python:3.10-bullseye
WORKDIR /opt/oracle
RUN apt-get update && apt-get install -y libaio1
RUN wget https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip && \
unzip instantclient-basiclite-linuxx64.zip && rm -f instantclient-basiclite-linuxx64.zip && \
cd /opt/oracle/instantclient* && rm -f *jdbc* *occi* *mysql* *README *jar uidrvci genezi adrci && \
echo /opt/oracle/instantclient* > /etc/ld.so.conf.d/oracle-instantclient.conf && ldconfig
RUN python -m pip install oracledb
Oracle has Python cx_Oracle Dockerfiles at https://github.com/oracle/docker-images/tree/master/OracleLinuxDevelopers and cx_Oracle containers at https://github.com/orgs/oracle/packages
There is a two-part blog post series Docker for Oracle Database Applications in Node.js and Python that shows various ways to install. Also there is an Oracle webcast recording discussing cx_Oracle and Docker here .
If you are still using the cx_Oracle namespace, you always need to install Instant Client so a solution is to use:
FROM python:3.10-bullseye
RUN apt-get update && apt-get install -y libaio1
WORKDIR /opt/oracle
RUN wget https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip && \
unzip instantclient-basiclite-linuxx64.zip && rm -f instantclient-basiclite-linuxx64.zip && \
cd /opt/oracle/instantclient* && rm -f *jdbc* *occi* *mysql* *README *jar uidrvci genezi adrci && \
echo /opt/oracle/instantclient* > /etc/ld.so.conf.d/oracle-instantclient.conf && ldconfig
RUN python -m pip install cx_Oracle
If you use a different base image you may need to explicitly install wget and unzip.
try this:
FROM python:3.7.5
#Oracle Client setup
ENV ORACLE_HOME /opt/oracle/instantclient_19_5
ENV LD_RUN_PATH=$ORACLE_HOME
ENV LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME
COPY instantclient/* /tmp/
RUN apt-get update \
&& apt-get insatll -y build-essential unzip python-dev libaio-dev
RUN \
mkdir -p /opt/oracle && cd /opt/oracle \
&& unzip "/tmp/instantclient*.zip" && \
ln -s $ORACLE_HOME/libclntsh.so.19.1 $ORACLE_HOME/libclntsh.so \
&& ldconfig
# Working directory
WORKDIR /src
# Copying requirements.txt before entire build step
COPY requirements.txt /src/requirements.txt
RUN pip install --upgrade pip
# Installing necessary packages
RUN pip install -r requirements.txt
# Copying rest of files
COPY . /src
CMD ["python3", "/src/hello_oracle.py"]
and you can also use this in your python script before importing cx_Oracle
:
import ctypes
ctypes.cdll.LoadLibrary("/opt/oracle/instantclient_19_5/libclntsh.so")
import cx_Oracle
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