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README.md

Builds a lightweight image

Overview

Docker 官方提供了简便的多阶段构建，可以使生产的镜像更小。

Use Single Build

Dockerfile文件

ARG BUILD_IMAGE=golang:alpine
FROM ${BUILD_IMAGE}

# Copy golang source code from the host
WORKDIR /data/project
COPY ./ ./

# Get dependancies
RUN go get -d -v 

# Build the binary
RUN go build -o server .

CMD ["./server"]

执行构建命令

make build-image

查看镜像大小

lqshow/golang-single-build 镜像将近355MB

➜  docker images |grep golang-single-build
lqshow/golang-single-build                           46c1a7e                                      2850ca8700d9        23 seconds ago      355MB

Use multi-stage builds

多阶段构建，允许在一个 Dockfile 文件里使用多个 FROM 语句，每个 FROM都有自己的 base image。 通常情况下一个是构建时镜像，另外一个是运行时镜像。

# STEP 1 Build executable binary
ARG BUILD_IMAGE=golang:alpine
FROM ${BUILD_IMAGE} as builder

# Copy golang source code from the host
WORKDIR /data/project
COPY ./ ./

# Get dependancies and Build the binary
RUN go get -d -v
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o server .

# STEP 2 Build a small image
FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /data/project

# Copy our static executable binary
COPY --from=builder /data/project/server .
CMD ["./server"]

执行构建命令

make multi-stage-build-image

查看镜像大小

建立一个轻量级(13.6MB)的镜像

➜   docker images |grep golang-multi-stage-build
lqshow/golang-multi-stage-build                            46c1a7e                                      24a8db0afe36        23 seconds ago      13.6MB

References