Dockerfile

# Dockerfile for Jenkins with Docker support
FROM jenkins/jenkins:lts

# Switch to root to install Docker
USER root

# Install Docker CLI and other required packages
RUN apt-get update && apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release \
    && curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg \
    && echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null \
    && apt-get update \
    && apt-get install -y docker-ce-cli \
    && rm -rf /var/lib/apt/lists/*

# Switch back to Jenkins user
USER jenkins

# Install recommended Jenkins plugins
RUN jenkins-plugin-cli --plugins \
    docker-workflow \
    docker-commons \
    docker-build-step \
    docker-custom-build-environment \
    docker-slaves \
    docker-plugin \
    blueocean \
    github-branch-source \
    pipeline-github-lib \
    credentials-binding \
    git

# Set environment variables
ENV DOCKER_HOST unix:///var/run/docker.sock
ENV JENKINS_OPTS="--httpPort=8080"

# Volume for Jenkins data persistence
VOLUME /var/jenkins_home

# Expose the default Jenkins port
EXPOSE 8080

# Health check for the container
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD curl -sSLf http://localhost:8080/login > /dev/null