upx compression

Author: johnlam90

Dockerfile

@@ -18,22 +18,31 @@ RUN sed -i '/^toolchain/d' go.mod && GOTOOLCHAIN=${GOTOOLCHAIN} go mod download
 COPY cmd/ cmd/
 COPY pkg/ pkg/
 
-# Build the ENI Controller
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOTOOLCHAIN=${GOTOOLCHAIN} go build -a -o manager cmd/main.go
+# Build the ENI Controller with optimizations for size
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOTOOLCHAIN=${GOTOOLCHAIN} \
+    go build -a -ldflags="-s -w" -trimpath -o manager cmd/main.go
 
-# Build the ENI Manager
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOTOOLCHAIN=${GOTOOLCHAIN} go build -a -o eni-manager cmd/eni-manager/main.go
+# Build the ENI Manager with optimizations for size
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOTOOLCHAIN=${GOTOOLCHAIN} \
+    go build -a -ldflags="-s -w" -trimpath -o eni-manager cmd/eni-manager/main.go
+
+# Use UPX to compress the binaries
+FROM alpine:3.19 AS compressor
+RUN apk --no-cache add upx
+COPY --from=builder /workspace/manager /manager
+COPY --from=builder /workspace/eni-manager /eni-manager
+RUN upx --best --lzma /manager /eni-manager
 
 # Use a minimal base image for the final image
 FROM alpine:3.19
 
-# Install iproute2 for the ip command (used as fallback by ENI Manager)
-RUN apk --no-cache add iproute2
+# Install only the necessary packages
+RUN apk --no-cache add iproute2 --no-scripts
 
-# Copy the binaries from the builder stage
+# Copy the compressed binaries from the compressor stage
 WORKDIR /
-COPY --from=builder /workspace/manager .
-COPY --from=builder /workspace/eni-manager .
+COPY --from=compressor /manager .
+COPY --from=compressor /eni-manager .
 COPY build/entrypoint.sh /entrypoint.sh
 
 # Make the entrypoint script executable