Merge pull request kubernetes#31241 from m1093782566/m109-cross-build…

…-serve-hostname

Automatic merge from submit-queue

Cross-build test/images/serve_hostname

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**What this PR does / why we need it**:

**cross build** `test/images/serve_hostname`

https://github.com/kubernetes/kubernetes/tree/master/test/images/serve_hostname

This PR is an effort to achieve multiarch Kubernetes(kubernetes#26863)

**Which issue this PR fixes** : 

fixes kubernetes#31238 

@luxas @spxtr

test/images/serve_hostname/Dockerfile

@@ -12,9 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM busybox
+FROM BASEIMAGE
 MAINTAINER Tim Hockin <[email protected]>
 ADD serve_hostname /serve_hostname
-ADD serve_hostname.go /serve_hostname.go
 EXPOSE 9376
 ENTRYPOINT ["/serve_hostname"]

test/images/serve_hostname/Makefile

@@ -12,26 +12,89 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-all: serve_hostname
+# Cross-build the serve_hostname image
+#
+# Usage:
+#       [TAG=v1.5] [PREFIX=gcr.io/google_containers] [TEST_REGISTRY=b.gcr.io/k8s_authenticated_test] [ARCH=amd64] [BASEIMAGE=busybox] make all
+
+.PHONY: all push container clean
+
+TAG ?= v1.5
+
+REGISTRY ?= gcr.io/google_containers
+TEST_REGISTRY ?= b.gcr.io/k8s_authenticated_test
+
+# Architectures supported: amd64, arm, arm64 and ppc64le
+ARCH ?= amd64
+
+ALL_ARCH = amd64 arm arm64 ppc64le
+
+GOARM=6
+TEMP_DIR := $(shell mktemp -d)
+GOLANG_VERSION = 1.6.3
+
+BIN = serve_hostname
+SRCS = serve_hostname.go
+
+IMAGE = $(REGISTRY)/$(BIN)-$(ARCH)
+TEST_IMAGE = $(TEST_REGISTRY)/$(BIN)-$(ARCH)
 
-TAG = v1.4
-PREFIX = gcr.io/google_containers
-TEST_PREFIX = b.gcr.io/k8s_authenticated_test
+# Set default base image dynamically for each arch
+ifeq ($(ARCH),amd64)
+        BASEIMAGE?=busybox
+endif
+ifeq ($(ARCH),arm)
+        BASEIMAGE?=armel/busybox
+endif
+ifeq ($(ARCH),arm64)
+        BASEIMAGE?=aarch64/busybox
+endif
+ifeq ($(ARCH),ppc64le)
+        BASEIMAGE?=ppc64le/busybox
+endif
 
-serve_hostname: serve_hostname.go
-	CGO_ENABLED=0 go build -a -installsuffix cgo --ldflags '-w' ./serve_hostname.go
+# If you want to build AND push all containers, see the 'all-push' rule.
+all: all-container
 
-container: serve_hostname
-	docker build -t $(PREFIX)/serve_hostname:$(TAG) .
-	if [ -n "$(TEST_PREFIX)" ]; then \
-	    docker tag -f $(PREFIX)/serve_hostname:$(TAG) $(TEST_PREFIX)/serve_hostname:$(TAG); \
+sub-container-%:
+	$(MAKE) ARCH=$* container
+
+sub-push-%:
+	$(MAKE) ARCH=$* push
+
+all-container: $(addprefix sub-container-,$(ALL_ARCH))
+
+all-push: $(addprefix sub-push-,$(ALL_ARCH))
+
+build: bin/$(BIN)-$(ARCH)
+
+bin/$(BIN)-$(ARCH): $(SRCS)
+	# Copy the content in this dir to the temp dir
+	cp ./* $(TEMP_DIR)
+
+	docker run -it -v $(TEMP_DIR):/build \
+	golang:$(GOLANG_VERSION) \
+	/bin/bash -c "\
+            cd /build && \
+            CGO_ENABLED=0 GOARM=$(GOARM) GOARCH=$(ARCH) go build -a -installsuffix cgo --ldflags '-w' -o $(BIN) ./$(SRCS)"
+
+container: .container-$(ARCH)
+.container-$(ARCH): bin/$(BIN)-$(ARCH)
+	# Set the base image
+	cd $(TEMP_DIR) && sed -i.bak 's|BASEIMAGE|$(BASEIMAGE)|g' Dockerfile
+
+	docker build -t $(IMAGE):$(TAG) $(TEMP_DIR)
+	if [ -n "$(TEST_REGISTRY)" ]; then \
+		docker tag $(IMAGE):$(TAG) $(TEST_IMAGE):$(TAG) ;\
 	fi
 
-push:
-	gcloud docker push $(PREFIX)/serve_hostname:$(TAG)
-	if [ -n "$(TEST_PREFIX)" ]; then \
-	    gcloud docker push $(TEST_PREFIX)/serve_hostname:$(TAG); \
+push: .push-$(ARCH)
+.push-$(ARCH): .container-$(ARCH)
+	gcloud docker push $(IMAGE):$(TAG)
+	if [ -n "$(TEST_REGISTRY)" ]; then \
+		gcloud docker push $(TEST_IMAGE):$(TAG) ;\
 	fi
 
 clean:
-	rm -f serve_hostname
+	rm -rf $(BIN)
+

test/images/serve_hostname/README.md

@@ -1,7 +1,33 @@
-serve_hostname
-==============
+## serve_hostname
 
-Util app to serve your hostname on TCP and/or UDP.  Useful for testing.
+This is a small util app to serve your hostname on TCP and/or UDP.  Useful for testing.
+
+The `serve_hostname` Makefile supports multiple architectures, which means it may cross-compile and build an docker image easily.
+Arch-specific busybox images serve as base images.
+
+If you are releasing a new version, please bump the `TAG` value in the `Makefile` before building the images.
+
+## How to release:
+
+```
+# Build cross-platform binaries
+$ make all-push
+
+# Build for linux/amd64 (default)
+$ make push ARCH=amd64
+# ---> gcr.io/google_containers/serve_hostname-amd64:TAG
+
+$ make push ARCH=arm
+# ---> gcr.io/google_containers/serve_hostname-arm:TAG
+
+$ make push ARCH=arm64
+# ---> gcr.io/google_containers/serve_hostname-arm64:TAG
+
+$ make push ARCH=ppc64le
+# ---> gcr.io/google_containers/serve_hostname-ppc64le:TAG
+```
+
+Of course, if you don't want to push the images, run `make all-container` or `make container ARCH={target_arch}` instead.
 
 
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