diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..74bc3d4
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,13 @@
+node_modules
+dist
+.git
+.github
+__tests__
+coverage
+*.tsbuildinfo
+.env*
+.claude
+foundation
+CLAUDE.md
+.foundation-*
+vitest.config.ts
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 0000000..39d3f04
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,54 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+    branches: [main]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: jtalborough/relayplane-proxy
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..1374b82
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,21 @@
+FROM node:18-alpine AS builder
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN if [ -f package-lock.json ]; then npm ci --include=optional; else npm install --include=optional; fi
+COPY tsconfig.json ./
+COPY src/ ./src/
+RUN npm run build
+
+FROM node:18-alpine
+WORKDIR /app
+ENV NODE_ENV=production
+COPY package.json package-lock.json* ./
+RUN if [ -f package-lock.json ]; then npm ci --omit=dev --include=optional; else npm install --omit=dev --include=optional; fi && npm cache clean --force
+COPY --from=builder /app/dist/ ./dist/
+RUN mkdir -p /home/node/.relayplane && \
+    chown -R node:node /home/node/.relayplane
+USER node
+EXPOSE 4801
+ENV RELAYPLANE_PROXY_HOST=0.0.0.0
+ENV RELAYPLANE_PROXY_PORT=4801
+ENTRYPOINT ["node", "dist/cli.js"]
diff --git a/src/cli.ts b/src/cli.ts
index 2f5b798..3f3c4b7 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -846,9 +846,9 @@ async function main(): Promise<void> {
     process.exit(0);
   }
 
-  // Parse server options
-  let port = 4100;
-  let host = '127.0.0.1';
+  // Parse server options (env vars provide defaults, CLI flags override)
+  let port = parseInt(process.env.RELAYPLANE_PROXY_PORT ?? '4100', 10);
+  let host = process.env.RELAYPLANE_PROXY_HOST ?? '127.0.0.1';
   let verbose = false;
   let audit = false;
   let offline = false;