use docker build kit

Author: fabriziopandini

Dockerfile

@@ -1,3 +1,5 @@
+# syntax = docker/dockerfile:1-experimental
+
 # Copyright 2018 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -33,14 +35,16 @@ RUN go mod download
 COPY ./ ./
 
 # Cache the go build
-RUN go build .
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    go build .
 
 # Build
 ARG package=.
 ARG ARCH
 
 # Do not force rebuild of up-to-date packages (do not use -a)
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH} \
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH} \
     go build -ldflags '-extldflags "-static"' \
     -o manager ${package}
 

Makefile

@@ -326,19 +326,19 @@ docker-build: ## Build the docker images for controller managers
 
 .PHONY: docker-build-core
 docker-build-core: ## Build the docker image for core controller manager
-	docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) . -t $(CONTROLLER_IMG)-$(ARCH):$(TAG)
+	DOCKER_BUILDKIT=1 docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) . -t $(CONTROLLER_IMG)-$(ARCH):$(TAG)
 	$(MAKE) set-manifest-image MANIFEST_IMG=$(CONTROLLER_IMG)-$(ARCH) MANIFEST_TAG=$(TAG) TARGET_RESOURCE="./config/manager/manager_image_patch.yaml"
 	$(MAKE) set-manifest-pull-policy TARGET_RESOURCE="./config/manager/manager_pull_policy.yaml"
 
 .PHONY: docker-build-kubeadm-bootstrap
 docker-build-kubeadm-bootstrap: ## Build the docker image for kubeadm bootstrap controller manager
-	docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) --build-arg package=./bootstrap/kubeadm . -t $(KUBEADM_BOOTSTRAP_CONTROLLER_IMG)-$(ARCH):$(TAG)
+	DOCKER_BUILDKIT=1 docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) --build-arg package=./bootstrap/kubeadm . -t $(KUBEADM_BOOTSTRAP_CONTROLLER_IMG)-$(ARCH):$(TAG)
 	$(MAKE) set-manifest-image MANIFEST_IMG=$(KUBEADM_BOOTSTRAP_CONTROLLER_IMG)-$(ARCH) MANIFEST_TAG=$(TAG) TARGET_RESOURCE="./bootstrap/kubeadm/config/manager/manager_image_patch.yaml"
 	$(MAKE) set-manifest-pull-policy TARGET_RESOURCE="./bootstrap/kubeadm/config/manager/manager_pull_policy.yaml"
 
 .PHONY: docker-build-kubeadm-control-plane
 docker-build-kubeadm-control-plane: ## Build the docker image for kubeadm control plane controller manager
-	docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) --build-arg package=./controlplane/kubeadm . -t $(KUBEADM_CONTROL_PLANE_CONTROLLER_IMG)-$(ARCH):$(TAG)
+	DOCKER_BUILDKIT=1 docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) --build-arg package=./controlplane/kubeadm . -t $(KUBEADM_CONTROL_PLANE_CONTROLLER_IMG)-$(ARCH):$(TAG)
 	$(MAKE) set-manifest-image MANIFEST_IMG=$(KUBEADM_CONTROL_PLANE_CONTROLLER_IMG)-$(ARCH) MANIFEST_TAG=$(TAG) TARGET_RESOURCE="./controlplane/kubeadm/config/manager/manager_image_patch.yaml"
 	$(MAKE) set-manifest-pull-policy TARGET_RESOURCE="./controlplane/kubeadm/config/manager/manager_pull_policy.yaml"
 
@@ -494,7 +494,7 @@ EXAMPLE_PROVIDER_IMG ?= $(REGISTRY)/example-provider-controller
 
 .PHONY: docker-build-example-provider
 docker-build-example-provider: ## Build the docker image for example provider
-	docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) . -f ./cmd/example-provider/Dockerfile -t $(EXAMPLE_PROVIDER_IMG)-$(ARCH):$(TAG)
+	DOCKER_BUILDKIT=1 docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) . -f ./cmd/example-provider/Dockerfile -t $(EXAMPLE_PROVIDER_IMG)-$(ARCH):$(TAG)
 	sed -i'' -e 's@image: .*@image: '"${EXAMPLE_PROVIDER_IMG}-$(ARCH):$(TAG)"'@' ./config/ci/manager/manager_image_patch.yaml
 
 ## --------------------------------------

cmd/example-provider/Dockerfile

@@ -1,3 +1,5 @@
+# syntax = docker/dockerfile:1-experimental
+
 # Copyright 2019 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

docs/Dockerfile

@@ -1,3 +1,5 @@
+# syntax = docker/dockerfile:1-experimental
+
 # Copyright 2019 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

hack/boilerplate/boilerplate.Dockerfile.txt

@@ -1,3 +1,5 @@
+# syntax = docker/dockerfile:1-experimental
+
 # Copyright YEAR The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

test/infrastructure/docker/Dockerfile

@@ -1,3 +1,5 @@
+# syntax = docker/dockerfile:1-experimental
+
 # Copyright 2019 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -41,7 +43,8 @@ COPY . .
 WORKDIR /workspace/test/infrastructure/docker
 
 # Build the CAPD manager
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o /workspace/manager main.go
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o /workspace/manager main.go
 
 # Use alpine:latest as minimal base image to package the manager binary and its dependencies
 FROM alpine:latest

test/infrastructure/docker/Makefile

@@ -136,7 +136,7 @@ modules: ## Runs go mod to ensure modules are up to date.
 
 .PHONY: docker-build
 docker-build: ## Build the docker image for controller-manager
-	docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) ../../.. -t $(CONTROLLER_IMG)-$(ARCH):$(TAG) --file Dockerfile
+	DOCKER_BUILDKIT=1 docker build --pull --build-arg goproxy=$(GOPROXY) --build-arg ARCH=$(ARCH) ../../.. -t $(CONTROLLER_IMG)-$(ARCH):$(TAG) --file Dockerfile
 	MANIFEST_IMG=$(CONTROLLER_IMG)-$(ARCH) MANIFEST_TAG=$(TAG) $(MAKE) set-manifest-image
 	$(MAKE) set-manifest-pull-policy