An example docker file.
Note a RUN in docker file will commit changes to the build
A CMD command is run when the docker container is run. There is only one CMD per docker build.
FROM parent_image:v1
LABEL Remarks="xyz image"
WORKDIR /app
COPY . /app
#run yum clean all after every yum to clean up and avoid rpmdb checksum invalid error.
RUN yum install -y openssl ; yum clean all
#temporily disable the local ABC.repo. this can be done through repo manager as well.
RUN mv /etc/yum.repos.d/ABC.repo /etc/yum.repos.d/ABC.repo.bak
#copy the external ms odbc repo , the mssql-release.repo file is included in the docker build folder
RUN mv mssql-release.repo /etc/yum.repos.d/mssql-release.repo
#backup the yum.conf and put in proxy settings, so as to access the ms odbc repo
RUN cp /etc/yum.conf /etc/yum.conf.bak
RUN echo "proxy=http://myproxy:8080" >> /etc/yum.conf && \
echo "proxy_username=user" >> /etc/yum.conf && \
echo "proxy_password=password" >> /etc/yum.conf
RUN ACCEPT_EULA=Y yum install -y msodbcsql17; yum clean all
RUN mv /etc/yum.conf.bak /etc/yum.conf
#copy the local repo back and disable the ms odbc repo
RUN mv /etc/yum.repos.d/ABC.repo.bak /etc/yum.repos.d/ABC.repo
RUN mv /etc/yum.repos.d/mssql-release.repo /etc/yum.repos.d/mssql-release.repo.bak
#install packages through yum
RUN yum install -y pyodbc ; yum clean all
RUN yum install -y gcc ; yum clean all
RUN yum install -y python2-pip ; yum clean all
#install python stuff
RUN pip install --upgrade pip --proxy http://myproxy:8080
RUN pip install flask --proxy http://myproxy:8080
RUN pip install gunicorn --proxy http://myproxy:8080
RUN pip install numpy --proxy http://myproxy:8080
RUN pip install scipy --proxy http://myproxy:8080
RUN pip install xgboost --proxy http://myproxy:8080
#open the port number
EXPOSE 8080
#run the gunicorn command to start the service when running the docker image
#the my_module.py is the flask service script included in the docker build folder.
#start the flask service through gunicorn at 8080
#when running a docker container, use docker run -P 8080:8081 my_image:v1 to map port 8080 to port 8081
CMD ["gunicorn", "-b 0.0.0.0:8080", "my_module:my_service"]