Docker使用Buildx多架构镜像构建指南

# 检查 Docker 版本（需 >= 19.03）
docker --version
# 启用 Buildx（若未默认启用）
export DOCKER_CLI_EXPERIMENTAL=enabled
docker buildx version

# Linux 手动安装
mkdir -p ~/.docker/cli-plugins
wget -O ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/latest/download/buildx-$(uname -s)-$(uname -m)
chmod +x ~/.docker/cli-plugins/docker-buildx

# 创建并激活构建器
docker buildx create --name multiarch --use --platform linux/amd64,linux/arm64
docker buildx inspect --bootstrap

docker buildx build \
  --platform linux/amd64,linux/arm64 \
  -t username/myapp:latest \
  --push .

docker buildx build --platform linux/amd64,linux/arm64 -t myapp --cache-from type=registry,ref=username/myapp:cache --cache-to type=inline .

FROM golang:alpine AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp .
FROM alpine
COPY --from=builder /app/myapp /usr/local/bin/
CMD ["myapp"]

# 查看构建器详情
docker buildx inspect
# 运行跨平台测试容器
docker run --rm --platform linux/arm64 alpine uname -m

FROM --platform=$BUILDPLATFORM golang:alpine AS builder
ARG TARGETARCH
WORKDIR /app
COPY . .
RUN GOARCH=$TARGETARCH go build -o app .
FROM alpine
COPY --from=builder /app/app /app
CMD ["/app/app"]

docker buildx build --platform linux/amd64,linux/arm64 -t username/go-app --push .