Use buildx build linux/arm64 in docker-compose file

Question

I can build my dockerfile separately using following command:

docker buildx build --platform linux/arm64 -t testbuild .

now I want to use buildx in docker-compose file, but how, and how to say I want to use the arm64 architecture? This is the structure when I use the normal build.

testbuild:
build: …/testbuild
image: testbuild

Does anybody know?

Answer 1

您可以通过设置 ENV 变量COMPOSE_DOCKER_CLI_BUILD=1在 docker-compose 中使用 buildx ，如果 buildx 未设置为默认值，则应添加DOCKER_BUILDKIT=1 ：

COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose build

Answer 2

In docker-compose v2.4 was add attribute platform . Official documentation here .

Example:

version: '2.4'

services:
  testbuild:
    build: .../testbuild
    image: testbuild
    platform: linux/arm64/v8

PS Idk why, but it work only in docker-compose version 2.4

PSS About dockerx in docker-compose, he's not there. I think because dockerx is experimental feature in docker engine.