Creating a Container Image with External Java and Python

This procedure describes how to create a Docker container image that contains your own Java and Python instead of the default BMC-provided image that already contains Java version 21 (OpenJDK) and Python.

You need to create your image from another BMC-provided image that does not contain Java or Python. This image has the 9.22.100-k8s or 9.22.100-k8s-mft tag and is stored in the controlm/agent repository in the Docker Hub.

BMC-provided images are based on AlmaLinux Minimal, which includes a microdnf package manager.

Before You Begin

Ensure that the Linux x86_64 Java package is of a supported version and vendor, as listed in Control-M Compatibility with External Java Vendors.

BMC recommends that you use a headless variant of Java, whenever available, to reduce the image footprint and save space.

Begin

1. Create a Dockerfile with the following content:

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   FROM controlm/agent:9.22.100-k8s
   ENV BMC_INST_JAVA_HOME=<path to your installed JDK>
   RUN <JDK installation commands>
   RUN <Python installation commands>
   RUN ./update_java_home.sh

   To create a custom image on top of an MFT base image, use 9.22.100-k8s-mft instead of 9.22.100-k8s.

   Dockerfile with Amazon Corretto JDK:

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   FROM controlm/agent:9.22.100-k8s
   
   USER root
   RUN echo "Install Amazon Corretto JDK" \
       && rpm --import https://yum.corretto.aws/corretto.key \
       && curl -L -o /etc/yum.repos.d/corretto.repo https://yum.corretto.aws/corretto.repo \
       && microdnf install -y java-21-amazon-corretto-devel \
       && microdnf clean all \
       && java -version
   ENV BMC_INST_JAVA_HOME=/etc/alternatives/java_sdk
   
   ARG PYTHON_VERSION=3.12
   ENV PYTHON_LIB=python${PYTHON_VERSION//./}
   
   RUN set -ex \
       && echo "Install Python lib: ${PYTHON_LIB}" \
       && microdnf install -y ${PYTHON_LIB} \
       && microdnf clean all \
       # Configure Python environment
       && ln -s /usr/bin/python${PYTHON_VERSION} /usr/bin/python \
       && python${PYTHON_VERSION} -m ensurepip \
       && ln -s /usr/bin/pip3 /usr/bin/pip \
       && echo "Python versions:" \
       && python --version \
       && pip3 --version
   
   ARG USERNAME=controlm
   USER $USERNAME
   RUN ./update_java_home.sh

2. Build an image based on the Dockerfile that you created by running the following command:

   docker build . --tag <image name>

   The image name includes the name of the repository where you want to upload the created image.

   docker build . --tag private_repo/agent-with-amazon-corretto-java

3. Push the image to your private repository by running the following command:

   docker push <image name>

   The image name includes the name of the repository where you want to upload the image.

   docker push private_repo/agent-with-amazon-corretto-java