Add SGLang backend

.github/workflows/promote-to-latest.yml

@@ -5,7 +5,7 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: 'version'
+        description: "version"
         required: true
         type: string
 
@@ -42,6 +42,11 @@ jobs:
           echo "Promoting vLLM CUDA images"
           crane tag "docker/model-runner:${{ inputs.version }}-vllm-cuda" "latest-vllm-cuda"
 
+      - name: Promote SGLang CUDA images
+        run: |
+          echo "Promoting SGLang CUDA images"
+          crane tag "docker/model-runner:${{ inputs.version }}-sglang-cuda" "latest-sglang-cuda"
+
       - name: Promote ROCm images
         run: |
           echo "Promoting ROCm images"

.github/workflows/release.yml

@@ -5,28 +5,33 @@ on:
   workflow_dispatch:
     inputs:
       pushLatest:
-        description: 'Tag images produced by this job as latest'
+        description: "Tag images produced by this job as latest"
         required: false
         type: boolean
         default: false
       releaseTag:
-        description: 'Release tag'
+        description: "Release tag"
         required: false
         type: string
         default: "test"
       llamaServerVersion:
-        description: 'llama-server version'
+        description: "llama-server version"
         required: false
         type: string
         default: "latest"
       vllmVersion:
-        description: 'vLLM version'
+        description: "vLLM version"
         required: false
         type: string
         default: "0.12.0"
+      sglangVersion:
+        description: "SGLang version"
+        required: false
+        type: string
+        default: "0.4.0"
       # This can be removed once we have llama.cpp built for MUSA and CANN.
       buildMusaCann:
-        description: 'Build MUSA and CANN images'
+        description: "Build MUSA and CANN images"
         required: false
         type: boolean
         default: false
@@ -76,6 +81,12 @@ jobs:
             echo "docker/model-runner:latest-vllm-cuda" >> "$GITHUB_OUTPUT"
           fi
           echo 'EOF' >> "$GITHUB_OUTPUT"
+          echo "sglang-cuda<<EOF" >> "$GITHUB_OUTPUT"
+          echo "docker/model-runner:${{ inputs.releaseTag }}-sglang-cuda" >> "$GITHUB_OUTPUT"
+          if [ "${{ inputs.pushLatest }}" == "true" ]; then
+            echo "docker/model-runner:latest-sglang-cuda" >> "$GITHUB_OUTPUT"
+          fi
+          echo 'EOF' >> "$GITHUB_OUTPUT"
           echo "rocm<<EOF" >> "$GITHUB_OUTPUT"
           echo "docker/model-runner:${{ inputs.releaseTag }}-rocm" >> "$GITHUB_OUTPUT"
           if [ "${{ inputs.pushLatest }}" == "true" ]; then
@@ -155,6 +166,22 @@ jobs:
           provenance: mode=max
           tags: ${{ steps.tags.outputs.vllm-cuda }}
 
+      - name: Build SGLang CUDA image
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83
+        with:
+          file: Dockerfile
+          target: final-sglang
+          platforms: linux/amd64
+          build-args: |
+            "LLAMA_SERVER_VERSION=${{ inputs.llamaServerVersion }}"
+            "LLAMA_SERVER_VARIANT=cuda"
+            "BASE_IMAGE=nvidia/cuda:12.9.0-runtime-ubuntu24.04"
+            "SGLANG_VERSION=${{ inputs.sglangVersion }}"
+          push: true
+          sbom: true
+          provenance: mode=max
+          tags: ${{ steps.tags.outputs.sglang-cuda }}
+
       - name: Build ROCm image
         uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83
         with:

Dockerfile

@@ -33,7 +33,13 @@ COPY --link . .
 # Build the Go binary (static build)
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
-    CGO_ENABLED=1 GOOS=linux go build -ldflags="-s -w" -o model-runner ./main.go
+    CGO_ENABLED=1 GOOS=linux go build -ldflags="-s -w" -o model-runner .
+
+# Build the Go binary for SGLang (without vLLM)
+FROM builder AS builder-sglang
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    CGO_ENABLED=1 GOOS=linux go build -tags=novllm -ldflags="-s -w" -o model-runner .
 
 # --- Get llama.cpp binary ---
 FROM docker/docker-model-backend-llamacpp:${LLAMA_SERVER_VERSION}-${LLAMA_SERVER_VARIANT} AS llama-server
@@ -97,21 +103,58 @@ USER modelrunner
 
 # Install uv and vLLM as modelrunner user
 RUN curl -LsSf https://astral.sh/uv/install.sh | sh \
- && ~/.local/bin/uv venv --python /usr/bin/python3 /opt/vllm-env \
- && if [ "$TARGETARCH" = "amd64" ]; then \
-      WHEEL_ARCH="manylinux_2_31_x86_64"; \
-      WHEEL_URL="https://github.com/vllm-project/vllm/releases/download/v${VLLM_VERSION}/vllm-${VLLM_VERSION}%2B${VLLM_CUDA_VERSION}-${VLLM_PYTHON_TAG}-${WHEEL_ARCH}.whl"; \
-      ~/.local/bin/uv pip install --python /opt/vllm-env/bin/python "$WHEEL_URL"; \
+    && ~/.local/bin/uv venv --python /usr/bin/python3 /opt/vllm-env \
+    && if [ "$TARGETARCH" = "amd64" ]; then \
+    WHEEL_ARCH="manylinux_2_31_x86_64"; \
+    WHEEL_URL="https://github.com/vllm-project/vllm/releases/download/v${VLLM_VERSION}/vllm-${VLLM_VERSION}%2B${VLLM_CUDA_VERSION}-${VLLM_PYTHON_TAG}-${WHEEL_ARCH}.whl"; \
+    ~/.local/bin/uv pip install --python /opt/vllm-env/bin/python "$WHEEL_URL"; \
     else \
-      ~/.local/bin/uv pip install --python /opt/vllm-env/bin/python "vllm==${VLLM_VERSION}"; \
+    ~/.local/bin/uv pip install --python /opt/vllm-env/bin/python "vllm==${VLLM_VERSION}"; \
     fi
 
 RUN /opt/vllm-env/bin/python -c "import vllm; print(vllm.__version__)" > /opt/vllm-env/version
 
+# --- SGLang variant ---
+FROM llamacpp AS sglang
+
+ARG SGLANG_VERSION=0.5.6
+
+USER root
+
+# Install CUDA toolkit 13 for nvcc (needed for flashinfer JIT compilation)
+RUN apt update && apt install -y \
+    python3 python3-venv python3-dev \
+    curl ca-certificates build-essential \
+    libnuma1 libnuma-dev numactl ninja-build \
+    wget gnupg \
+    && wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64/cuda-keyring_1.1-1_all.deb \
+    && dpkg -i cuda-keyring_1.1-1_all.deb \
+    && apt update && apt install -y cuda-toolkit-13-0 \
+    && rm cuda-keyring_1.1-1_all.deb \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /opt/sglang-env && chown -R modelrunner:modelrunner /opt/sglang-env
+
+USER modelrunner
+
+# Set CUDA paths for nvcc (needed during flashinfer compilation)
+ENV PATH=/usr/local/cuda-13.0/bin:$PATH
+ENV LD_LIBRARY_PATH=/usr/local/cuda-13.0/lib64:$LD_LIBRARY_PATH
+
+# Install uv and SGLang as modelrunner user
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh \
+    && ~/.local/bin/uv venv --python /usr/bin/python3 /opt/sglang-env \
+    && ~/.local/bin/uv pip install --python /opt/sglang-env/bin/python "sglang==${SGLANG_VERSION}"
+
+RUN /opt/sglang-env/bin/python -c "import sglang; print(sglang.__version__)" > /opt/sglang-env/version
 FROM llamacpp AS final-llamacpp
 # Copy the built binary from builder
 COPY --from=builder /app/model-runner /app/model-runner
 
 FROM vllm AS final-vllm
 # Copy the built binary from builder
 COPY --from=builder /app/model-runner /app/model-runner
+
+FROM sglang AS final-sglang
+# Copy the built binary from builder-sglang (without vLLM)
+COPY --from=builder-sglang /app/model-runner /app/model-runner

Makefile

@@ -7,6 +7,8 @@ BASE_IMAGE := ubuntu:24.04
 VLLM_BASE_IMAGE := nvidia/cuda:13.0.2-runtime-ubuntu24.04
 DOCKER_IMAGE := docker/model-runner:latest
 DOCKER_IMAGE_VLLM := docker/model-runner:latest-vllm-cuda
+DOCKER_IMAGE_SGLANG := docker/model-runner:latest-sglang
+DOCKER_IMAGE_SGLANG_CUDA := docker/model-runner:latest-sglang-cuda
 DOCKER_TARGET ?= final-llamacpp
 PORT := 8080
 MODELS_PATH := $(shell pwd)/models-store
@@ -31,13 +33,13 @@ LICENSE ?=
 BUILD_DMR ?= 1
 
 # Main targets
-.PHONY: build run clean test integration-tests test-docker-ce-installation docker-build docker-build-multiplatform docker-run docker-build-vllm docker-run-vllm docker-run-impl help validate lint model-distribution-tool
+.PHONY: build run clean test integration-tests test-docker-ce-installation docker-build docker-build-multiplatform docker-run docker-build-vllm docker-run-vllm docker-build-sglang docker-run-sglang docker-build-sglang-cuda docker-run-sglang-cuda docker-run-impl help validate lint model-distribution-tool
 # Default target
 .DEFAULT_GOAL := build
 
 # Build the Go application
 build:
-	CGO_ENABLED=1 go build -ldflags="-s -w" -o $(APP_NAME) ./main.go
+	CGO_ENABLED=1 go build -ldflags="-s -w" -o $(APP_NAME) .
 
 # Build model-distribution-tool
 model-distribution-tool:
@@ -116,6 +118,30 @@ docker-build-vllm:
 docker-run-vllm: docker-build-vllm
 	@$(MAKE) -s docker-run-impl DOCKER_IMAGE=$(DOCKER_IMAGE_VLLM)
 
+# Build SGLang Docker image (CPU variant)
+docker-build-sglang:
+	@$(MAKE) docker-build \
+		DOCKER_TARGET=final-sglang \
+		DOCKER_IMAGE=$(DOCKER_IMAGE_SGLANG) \
+		LLAMA_SERVER_VARIANT=cpu \
+		BASE_IMAGE=$(BASE_IMAGE)
+
+# Run SGLang Docker container (CPU variant) with TCP port access and mounted model storage
+docker-run-sglang: docker-build-sglang
+	@$(MAKE) -s docker-run-impl DOCKER_IMAGE=$(DOCKER_IMAGE_SGLANG)
+
+# Build SGLang Docker image (CUDA variant)
+docker-build-sglang-cuda:
+	@$(MAKE) docker-build \
+		DOCKER_TARGET=final-sglang \
+		DOCKER_IMAGE=$(DOCKER_IMAGE_SGLANG_CUDA) \
+		LLAMA_SERVER_VARIANT=cuda \
+		BASE_IMAGE=$(VLLM_BASE_IMAGE)
+
+# Run SGLang Docker container (CUDA variant) with TCP port access and mounted model storage
+docker-run-sglang-cuda: docker-build-sglang-cuda
+	@$(MAKE) -s docker-run-impl DOCKER_IMAGE=$(DOCKER_IMAGE_SGLANG_CUDA)
+
 # Common implementation for running Docker container
 docker-run-impl:
 	@echo ""
@@ -178,6 +204,10 @@ help:
 	@echo "  docker-run			- Run in Docker container with TCP port access and mounted model storage"
 	@echo "  docker-build-vllm		- Build vLLM Docker image"
 	@echo "  docker-run-vllm		- Run vLLM Docker container"
+	@echo "  docker-build-sglang		- Build SGLang Docker image (CPU)"
+	@echo "  docker-run-sglang		- Run SGLang Docker container (CPU)"
+	@echo "  docker-build-sglang-cuda	- Build SGLang Docker image (CUDA)"
+	@echo "  docker-run-sglang-cuda	- Run SGLang Docker container (CUDA)"
 	@echo "  help				- Show this help message"
 	@echo ""
 	@echo "Model distribution tool targets:"

backends_vllm.go

@@ -0,0 +1,23 @@
+//go:build !novllm
+
+package main
+
+import (
+	"github.com/docker/model-runner/pkg/inference"
+	"github.com/docker/model-runner/pkg/inference/backends/vllm"
+	"github.com/docker/model-runner/pkg/inference/models"
+	"github.com/sirupsen/logrus"
+)
+
+func initVLLMBackend(log *logrus.Logger, modelManager *models.Manager) (inference.Backend, error) {
+	return vllm.New(
+		log,
+		modelManager,
+		log.WithFields(logrus.Fields{"component": vllm.Name}),
+		nil,
+	)
+}
+
+func registerVLLMBackend(backends map[string]inference.Backend, backend inference.Backend) {
+	backends[vllm.Name] = backend
+}

backends_vllm_stub.go

@@ -0,0 +1,17 @@
+//go:build novllm
+
+package main
+
+import (
+	"github.com/docker/model-runner/pkg/inference"
+	"github.com/docker/model-runner/pkg/inference/models"
+	"github.com/sirupsen/logrus"
+)
+
+func initVLLMBackend(log *logrus.Logger, modelManager *models.Manager) (inference.Backend, error) {
+	return nil, nil
+}
+
+func registerVLLMBackend(backends map[string]inference.Backend, backend inference.Backend) {
+	// No-op when vLLM is disabled
+}

main.go

@@ -15,6 +15,7 @@ import (
 	"github.com/docker/model-runner/pkg/inference"
 	"github.com/docker/model-runner/pkg/inference/backends/llamacpp"
 	"github.com/docker/model-runner/pkg/inference/backends/mlx"
+	"github.com/docker/model-runner/pkg/inference/backends/sglang"
 	"github.com/docker/model-runner/pkg/inference/backends/vllm"
 	"github.com/docker/model-runner/pkg/inference/config"
 	"github.com/docker/model-runner/pkg/inference/memory"
@@ -124,12 +125,7 @@ func main() {
 
 	memEstimator.SetDefaultBackend(llamaCppBackend)
 
-	vllmBackend, err := vllm.New(
-		log,
-		modelManager,
-		log.WithFields(logrus.Fields{"component": vllm.Name}),
-		nil,
-	)
+	vllmBackend, err := initVLLMBackend(log, modelManager)
 	if err != nil {
 		log.Fatalf("unable to initialize %s backend: %v", vllm.Name, err)
 	}
@@ -144,13 +140,26 @@ func main() {
 		log.Fatalf("unable to initialize %s backend: %v", mlx.Name, err)
 	}
 
+	sglangBackend, err := sglang.New(
+		log,
+		modelManager,
+		log.WithFields(logrus.Fields{"component": sglang.Name}),
+		nil,
+	)
+	if err != nil {
+		log.Fatalf("unable to initialize %s backend: %v", sglang.Name, err)
+	}
+
+	backends := map[string]inference.Backend{
+		llamacpp.Name: llamaCppBackend,
+		mlx.Name:      mlxBackend,
+		sglang.Name:   sglangBackend,
+	}
+	registerVLLMBackend(backends, vllmBackend)
+
 	scheduler := scheduling.NewScheduler(
 		log,
-		map[string]inference.Backend{
-			llamacpp.Name: llamaCppBackend,
-			vllm.Name:     vllmBackend,
-			mlx.Name:      mlxBackend,
-		},
+		backends,
 		llamaCppBackend,
 		modelManager,
 		http.DefaultClient,

pkg/inference/backend.go

@@ -110,6 +110,10 @@ type Backend interface {
 	// external model management system and false if the backend uses the shared
 	// model manager.
 	UsesExternalModelManagement() bool
+	// UsesTCP returns true if the backend uses TCP for communication instead
+	// of Unix sockets. When true, the scheduler will create a TCP transport
+	// and pass a "host:port" address to Run instead of a Unix socket path.
+	UsesTCP() bool
 	// Install ensures that the backend is installed. It should return a nil
 	// error if installation succeeds or if the backend is already installed.
 	// The provided HTTP client should be used for any HTTP operations.

pkg/inference/backends/llamacpp/llamacpp.go

@@ -89,6 +89,11 @@ func (l *llamaCpp) UsesExternalModelManagement() bool {
 	return false
 }
 
+// UsesTCP implements inference.Backend.UsesTCP.
+func (l *llamaCpp) UsesTCP() bool {
+	return false
+}
+
 // Install implements inference.Backend.Install.
 func (l *llamaCpp) Install(ctx context.Context, httpClient *http.Client) error {
 	l.updatedLlamaCpp = false

pkg/inference/backends/mlx/mlx.go

@@ -65,6 +65,11 @@ func (m *mlx) UsesExternalModelManagement() bool {
 	return false
 }
 
+// UsesTCP implements inference.Backend.UsesTCP.
+func (m *mlx) UsesTCP() bool {
+	return false
+}
+
 // Install implements inference.Backend.Install.
 func (m *mlx) Install(ctx context.Context, httpClient *http.Client) error {
 	if !platform.SupportsMLX() {