Building a Custom Ubuntu Image with SDKMAN and Using It in a GitLab CI/CD Pipeline

This article details creating a custom Ubuntu Docker image pre-configured with SDKMAN, a versatile SDK manager, and integrating it into a GitLab CI/CD pipeline. This ensures consistent development and CI/CD environments.

Step 1: Building the Custom Docker Image

The following Dockerfile creates an Ubuntu 20.04 image, installs dependencies, and sets up SDKMAN with specific Java, Scala, and sbt versions:

<code class="language-dockerfile"># Dockerfile
FROM ubuntu:20.04

# Install dependencies
RUN apt-get update && apt-get install -y curl unzip zip bash git vim wget jq tmux

# Install SDKMAN!
RUN curl -s "https://get.sdkman.io" | bash

# Set shell and source SDKMAN
SHELL ["/bin/bash", "-c"]
RUN source "$HOME/.sdkman/bin/sdkman-init.sh" && \
    sdk install java 21.0.2-open && \
    sdk install sbt 1.8.2 && \
    sdk install scala 2.13.10

# Set working directory
WORKDIR /app</code>

Explanation: The Dockerfile utilizes ubuntu:20.04 as its base. Essential tools are installed using apt-get. SDKMAN is installed via its script, and specific SDK versions are then installed. Finally, the working directory is set to /app.

Building and Pushing the Image

Build the image using:

<code class="language-bash">docker build -t bansikah/gitlab-ci:v1.0.1 .</code>

Push the image to your Docker registry (e.g., Docker Hub): (Image omitted for brevity, but the process is shown visually.)

Step 2: GitLab CI/CD Integration

This .gitlab-ci.yml file uses the custom image and verifies the SDKMAN installation:

<code class="language-yaml"># .gitlab-ci.yml
image: bansikah/gitlab-ci:v1.0.1

stages:
  - test

test-job:
  stage: test
  script:
    - echo "Checking SDKMAN version..."
    - source "$HOME/.sdkman/bin/sdkman-init.sh"
    - sdk version
    - echo "Checking installed SDKs..."</code>

Explanation: The .gitlab-ci.yml specifies the custom image. A test stage runs a job that sources SDKMAN, checks its version, and (implicitly) verifies the SDK installations by attempting to run sdk version.

Step 3: Running the Pipeline

Pushing the .gitlab-ci.yml to your GitLab repository triggers the pipeline. The test-job utilizes the custom image, verifying SDKMAN and its installed SDKs.

Conclusion

This custom Docker image streamlines development and CI/CD by providing a consistent environment with pre-installed SDKs. Further customization is possible by adding more SDKs or tools as needed. Refer to the SDKMAN, Docker, and GitLab CI/CD documentation for more information.

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