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More Dockerfile best practices

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* Use mounts for RUN commands to avoid creating extra layers
* Use built-in platform support

Signed-off-by: Christopher Crone <christopher.crone@docker.com>
This commit is contained in:
Christopher Crone 2020-05-29 11:30:12 +02:00
parent 9097b1f750
commit 247fa56ee1
2 changed files with 35 additions and 46 deletions
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68
Dockerfile
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@ -1,66 +1,58 @@
# syntax = docker/dockerfile:experimental # syntax = docker/dockerfile:experimental
ARG GO_VERSION=1.14.3-alpine ARG GO_VERSION=1.14.3-alpine
ARG GOLANGCI_LINT_VERSION=1.27.0 ARG GOLANGCI_LINT_VERSION=v1.27.0-alpine
FROM golang:${GO_VERSION} AS base FROM --platform=${BUILDPLATFORM} golang:${GO_VERSION} AS base
ARG TARGET_OS=unknown WORKDIR /api
ARG TARGET_ARCH=unknown
ARG PWD=/api
ENV GO111MODULE=on ENV GO111MODULE=on
RUN apk add --no-cache \
RUN apk update && apk add -U docker make docker \
make \
WORKDIR ${PWD} protoc
ADD go.* ${PWD} COPY go.* .
RUN go mod download RUN go mod download
ADD . ${PWD}
FROM golang:${GO_VERSION} AS protos-base
ARG TARGET_OS=unknown
ARG TARGET_ARCH=unknown
ARG PWD=/api
ENV GO111MODULE=on
RUN apk update && apk add protoc make
FROM base AS make-protos
RUN go get github.com/golang/protobuf/protoc-gen-go@v1.4.1 RUN go get github.com/golang/protobuf/protoc-gen-go@v1.4.1
COPY . .
WORKDIR ${PWD}
ADD go.* ${PWD}
ADD . ${PWD}
FROM protos-base AS make-protos
RUN make -f builder.Makefile protos RUN make -f builder.Makefile protos
FROM golangci/golangci-lint:v${GOLANGCI_LINT_VERSION}-alpine AS lint-base FROM golangci/golangci-lint:${GOLANGCI_LINT_VERSION} AS lint-base
FROM base AS lint FROM base AS lint
COPY --from=lint-base /usr/bin/golangci-lint /usr/bin/golangci-lint
ENV CGO_ENABLED=0 ENV CGO_ENABLED=0
RUN --mount=id=build,type=cache,target=/root/.cache/go-build \ COPY --from=lint-base /usr/bin/golangci-lint /usr/bin/golangci-lint
--mount=id=lint,type=cache,target=/root/.cache/golangci-lint \ RUN --mount=target=. \
--mount=type=cache,target=/root/.cache/go-build \
--mount=type=cache,target=/root/.cache/golangci-lint \
make -f builder.Makefile lint make -f builder.Makefile lint
FROM base AS make-cli FROM base AS make-cli
RUN --mount=id=build,type=cache,target=/root/.cache/go-build \ ENV CGO_ENABLED=0
GOOS=${TARGET_OS} \ ARG TARGETOS
GOARCH=${TARGET_ARCH} \ ARG TARGETARCH
make -f builder.Makefile cli RUN --mount=target=. \
--mount=type=cache,target=/root/.cache/go-build \
GOOS=${TARGETOS} \
GOARCH=${TARGETARCH} \
make BINARY=/out/docker -f builder.Makefile cli
FROM base AS make-cross FROM base AS make-cross
RUN --mount=id=build,type=cache,target=/root/.cache/go-build \ RUN --mount=target=. \
make -f builder.Makefile cross --mount=type=cache,target=/root/.cache/go-build \
make BINARY=/out/docker -f builder.Makefile cross
FROM scratch AS protos FROM scratch AS protos
COPY --from=make-protos /api/protos . COPY --from=make-protos /api/protos .
FROM scratch AS cli FROM scratch AS cli
COPY --from=make-cli /api/bin/* . COPY --from=make-cli /out/* .
FROM scratch AS cross FROM scratch AS cross
COPY --from=make-cross /api/bin/* . COPY --from=make-cross /out/* .
FROM base as test FROM base as test
ENV CGO_ENABLED=0 ENV CGO_ENABLED=0
RUN --mount=id=build,type=cache,target=/root/.cache/go-build \ RUN --mount=target=. \
--mount=type=cache,target=/root/.cache/go-build \
make -f builder.Makefile test make -f builder.Makefile test

13
Makefile
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@ -32,16 +32,13 @@ export DOCKER_BUILDKIT=1
all: cli all: cli
protos: ## Generate go code from .proto files protos: ## Generate go code from .proto files
@docker build . \ @docker build . --target protos \
--output type=local,dest=./protos \ --output type=local,dest=./protos
--target protos
cli: ## Compile the cli cli: ## Compile the cli
@docker build . \ @docker build . --target cli \
--output type=local,dest=./bin \ --platform local \
--build-arg TARGET_OS=${GOOS} \ --output type=local,dest=./bin
--build-arg TARGET_ARCH=${GOARCH} \
--target cli
e2e-local: ## Run End to end local tests e2e-local: ## Run End to end local tests
go test -v ./tests/e2e ./moby/e2e go test -v ./tests/e2e ./moby/e2e