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+# ================================================================================================
+# Stage 1: Download vLLM wheel and build torchtitan wheel
+# ================================================================================================
+FROM ubuntu:22.04 AS wheel-downloader
+
+# Install tools needed for downloading and building wheels
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    jq \
+    ca-certificates \
+    git \
+    python3.10 \
+    python3-pip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Download vLLM wheel from GitHub releases
+ARG GITHUB_REPO="meta-pytorch/forge"
+ARG RELEASE_TAG="v0.0.0-93025"
+ARG TORCHTITAN_COMMIT="0cfbd0b3c2d827af629a107a77a9e47229c31663"  # From assets/versions.sh - compatible with PyTorch 2.9
+
+WORKDIR /tmp/download
+
+# Download vLLM wheel
+RUN echo "Fetching vLLM wheel from GitHub release ${RELEASE_TAG}..." && \
+    # Get the release information from GitHub API
+    RELEASE_INFO=$(curl -s "https://api.github.com/repos/${GITHUB_REPO}/releases/tags/${RELEASE_TAG}") && \
+    # Extract the vLLM wheel download URL
+    VLLM_URL=$(echo "$RELEASE_INFO" | jq -r '.assets[] | select(.name | contains("vllm")) | .browser_download_url' | head -1) && \
+    VLLM_NAME=$(echo "$RELEASE_INFO" | jq -r '.assets[] | select(.name | contains("vllm")) | .name' | head -1) && \
+    echo "Downloading: $VLLM_NAME" && \
+    echo "URL: $VLLM_URL" && \
+    # Download the wheel
+    curl -L -o "/tmp/download/${VLLM_NAME}" "${VLLM_URL}" && \
+    echo "vLLM download complete"
+
+# Build torchtitan wheel from specific commit
+RUN echo "Building torchtitan from commit ${TORCHTITAN_COMMIT}..." && \
+    cd /tmp && \
+    git clone https://github.com/pytorch/torchtitan.git && \
+    cd torchtitan && \
+    git checkout ${TORCHTITAN_COMMIT} && \
+    python3 -m pip install --upgrade pip wheel && \
+    pip wheel --no-deps . -w /tmp/download && \
+    echo "torchtitan build complete: $(ls -lh /tmp/download/*.whl)"
+
+# ================================================================================================
+# Stage 2: Main application image
+# ================================================================================================
+FROM nvidia/cuda:12.9.1-base-ubuntu22.04
+
+# Metadata labels
+LABEL maintainer="PyTorch Team"
+LABEL description="Forge - A PyTorch-native agentic RL library for post-training large language models"
+LABEL cuda.version="12.9.1"
+LABEL python.version="3.10"
+
+# Set environment to avoid interactive prompts during build
+ENV DEBIAN_FRONTEND=noninteractive
+
+# ================================================================================================
+# Install system dependencies
+# ================================================================================================
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    # Build tools (needed for compiling Python extensions)
+    build-essential \
+    git \
+    curl \
+    ca-certificates \
+    # RDMA/InfiniBand libraries for distributed training
+    libibverbs1 \
+    libibverbs-dev \
+    rdma-core \
+    libmlx5-1 \
+    && rm -rf /var/lib/apt/lists/*
+
+# ================================================================================================
+# Set up CUDA environment variables
+# ================================================================================================
+# These environment variables match those set by cuda_env.sh in the installation script
+ENV CUDA_VERSION=12.9
+ENV CUDA_HOME=/usr/local/cuda-${CUDA_VERSION}
+ENV NVCC=${CUDA_HOME}/bin/nvcc
+ENV CUDA_NVCC_EXECUTABLE=${CUDA_HOME}/bin/nvcc
+ENV CUDA_INCLUDE_DIRS=${CUDA_HOME}/include
+ENV CUDA_CUDART_LIBRARY=${CUDA_HOME}/lib64/libcudart.so
+
+# Add CUDA binaries to PATH
+ENV PATH="${CUDA_HOME}/bin:${PATH}"
+
+# Add CUDA compat libs to LD_LIBRARY_PATH
+# This is critical for PyTorch and vLLM to find CUDA libraries
+ENV LD_LIBRARY_PATH="${CUDA_HOME}/compat:${LD_LIBRARY_PATH}"
+
+# Temporary flag required by Monarch
+ENV MONARCH_HOST_MESH_V1_REMOVE_ME_BEFORE_RELEASE=1
+
+# Create symlink if /usr/local/cuda-12.9 doesn't exist but /usr/local/cuda does
+RUN if [ ! -d "/usr/local/cuda-12.9" ] && [ -d "/usr/local/cuda" ]; then \
+    ln -s /usr/local/cuda /usr/local/cuda-12.9; \
+    fi
+
+# ================================================================================================
+# Install uv package manager
+# ================================================================================================
+# Install uv - a fast Python package installer
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
+    # Make uv available in PATH
+    ln -s /root/.local/bin/uv /usr/local/bin/uv && \
+    ln -s /root/.local/bin/uvx /usr/local/bin/uvx
+
+# Set working directory early so venv is created in project directory
+WORKDIR /workspace
+
+# Install Python 3.10 via uv (required by monarch wheel cp310)
+RUN uv python install 3.10 && \
+    # Create a virtual environment at project location using uv-managed Python 3.10
+    uv venv --python 3.10 .venv
+
+# Activate the virtual environment by adding it to PATH
+ENV PATH="/workspace/.venv/bin:${PATH}"
+ENV VIRTUAL_ENV="/workspace/.venv"
+
+# Add uv-managed Python library path to LD_LIBRARY_PATH for monarch
+# Monarch needs libpython3.10.so.1.0 which is provided by uv's Python installation
+ENV LD_LIBRARY_PATH="/root/.local/share/uv/python/cpython-3.10.19-linux-x86_64-gnu/lib:${LD_LIBRARY_PATH}"
+
+# ================================================================================================
+# Install PyTorch nightly with uv
+# ================================================================================================
+# Install PyTorch nightly with CUDA 12.9 support
+# This is a large download and should be in its own layer for caching
+ARG PYTORCH_VERSION="2.9.0.dev20250905"
+RUN uv pip install --no-cache \
+    torch==${PYTORCH_VERSION} \
+    --index-url https://download.pytorch.org/whl/nightly/cu129
+
+# ================================================================================================
+# Install pre-built wheels
+# ================================================================================================
+# Create temporary directory for wheels
+RUN mkdir -p /tmp/wheels
+
+# Copy local wheels from assets directory (excluding torchtitan - we build it fresh)
+COPY assets/wheels/monarch*.whl assets/wheels/torchstore*.whl /tmp/wheels/
+
+# Copy downloaded vLLM and built torchtitan wheels from stage 1
+COPY --from=wheel-downloader /tmp/download/*.whl /tmp/wheels/
+
+# Install all wheels using uv
+# The wheels include: monarch, torchstore, freshly-built torchtitan, and vLLM
+RUN uv pip install --no-cache /tmp/wheels/*.whl && \
+    rm -rf /tmp/wheels
+
+# ================================================================================================
+# Install Forge
+# ================================================================================================
+# Copy the entire source tree
+# .dockerignore will exclude unnecessary files
+COPY . /workspace/
+
+# Install Forge in production mode (not editable)
+# This installs the forge package and its dependencies
+RUN uv pip install --no-cache .
+
+# ================================================================================================
+# Final setup
+# ================================================================================================
+# Verify installations (basic import checks that don't require GPU)
+# The virtual environment is activated via PATH, so python uses the venv
+RUN python -c "import torch; print(f'PyTorch version: {torch.__version__}')" && \
+    python -c "import vllm; print('vLLM imported successfully')" && \
+    python -c "import forge; print('Forge imported successfully')"
+
+# Set default command to bash for interactive use
+# Users can override this when running the container
+CMD ["/bin/bash"]