Dockerfile: Python3 not found - docker

Question

I am trying to convert a bash script to a Dockerfile since we are going the containerization route with AWS Batch
Basically I install CPLEX (an optimization library) and Anaconda, install some related packages, check if my environment it good to go, and then kick off a shell script to run the batch job.
Here is a snippet of my Dockerfile:
FROM amazonlinux:latest
# Download packages for container
RUN yum update -y
RUN yum -y install which unzip aws-cli \
RUN yum install -y tar.x86_64
RUN yum install gzip -y
RUN yum install ncompress -y
RUN yum -y install wget
RUN yum install -y nano
# Set working directory
WORKDIR /setup
#: Copy CPLEX installer binary and installation script.
COPY cplex_odee1210.linux-x86-64.bin /setup/
COPY cplex_installer_input.sh /setup/
#: Install CPLEX and update .bashrc
RUN chmod +x /setup/cplex_odee1210.linux-x86-64.bin
RUN chmod +x cplex_installer_input.sh
RUN ./cplex_installer_input.sh | bash cplex_odee1210.linux-x86-64.bin
RUN echo 'export PATH=$PATH:/opt/ibm/ILOG/CPLEX_Optimizer1210/cplex/bin/x86-64_linux' >>/root/.bashrc \
&& /bin/bash -c "source ~/.bashrc"
ENV PATH $PATH:/opt/ibm/ILOG/CPLEX_Optimizer1210/cplex/bin/x86-64_linux
#: Download Anaconda
COPY Anaconda3-2019.10-Linux-x86_64.sh /setup/
RUN bash Anaconda3-2019.10-Linux-x86_64.sh -b -p /home/ec2-user/anaconda3
RUN echo 'export PATH=$PATH:/home/ec2-user/anaconda3/bin' >>/root/.bashrc \
&& /bin/bash -c "source ~/.bashrc"
ENV PATH $PATH:/home/ec2-user/anaconda3/bin
RUN conda install pandas -y \
&& conda install numpy -y \
&& conda install ujson -y \
&& pip install docplex \
&& pip install boto3 \
&& pip install grpcio \
&& pip install grpcio-tools
RUN python3 -m docplex.mp.environment
ADD fetch_and_run.sh /usr/local/bin/fetch_and_run.sh
ENTRYPOINT ["/usr/local/bin/fetch_and_run.sh"]
From there, I kick off a bash script
#!/bin/bash
date
echo "Args: $#"
env
echo "script_path: $1"
echo "script_name: $2"
echo "path_prefix: $3"
echo "jobID: $AWS_BATCH_JOB_ID"
echo "jobQueue: $AWS_BATCH_JQ_NAME"
echo "computeEnvironment: $AWS_BATCH_CE_NAME"
echo "current directory: $(pwd)"
mkdir /tmp/scripts/
aws s3 cp $1 /tmp/scripts/$2
python3 /tmp/scripts/${#:2}
But for some reason, I keep getting
/tmp/tmp.hQlWYBEFs/batch-file-temp: line 20: python3: command not found
Do I need to change some PATH variables? Why isn't Docker picking up my Python 3 version?

Answer 1

The image needs to have python3 installed. Building images works off of files and programs that exist in the container. The python3 you have installed on your own system is not available.