Windows和Mac的桌面版Docker自带buildx命令，但是Linux环境下的Docker需要自行安装buildx （https://github.com/docker/buildx）

    https://docs.docker.com/buildx/working-with-buildx/

    本节课使用的源码 https://github.com/xiaopeng163/flask-redis 登录dockerhub 
    1. docker login
    进入源码目录（Dockerfile所在目录） 
    1. git clone https://github.com/xiaopeng163/flask-redis
    2. cd flask-redis
    构建 
    1. PS C:\Users\Peng Xiao\flask-redis> docker login
    2. Authenticating with existing credentials...
    3. Login Succeeded
    4. PS C:\Users\Peng Xiao\flask-redis> docker buildx build --push --platform linux/arm/v7,linux/arm64/v8,linux/amd64 -t xiaopeng163/flask-redis:latest .
    5. [+] Building 0.0s (0/0)
    6. error: multiple platforms feature is currently not supported for docker driver. Please switch to a different driver (eg. "docker buildx create --use")
    7. PS C:\Users\Peng Xiao\flask-redis>
    8. PS C:\Users\Peng Xiao\flask-redis> docker buildx ls
    9. NAME/NODE       DRIVER/ENDPOINT STATUS  PLATFORMS
    10. desktop-linux   docker
    11. desktop-linux desktop-linux   running linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
    12. default *       docker
    13. default       default         running linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
    14. PS C:\Users\Peng Xiao\flask-redis> docker buildx create --name mybuilder --use
    15. mybuilder
    16. PS C:\Users\Peng Xiao\flask-redis> docker buildx ls
    17. NAME/NODE       DRIVER/ENDPOINT                STATUS   PLATFORMS
    18. mybuilder *     docker-container
    19. mybuilder0    npipe:////./pipe/docker_engine inactive
    20. desktop-linux   docker
    21. desktop-linux desktop-linux                  running  linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
    22. default         docker
    23. default       default                        running  linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
    24. PS C:\Users\Peng Xiao\flask-redis> docker buildx build --push --platform linux/arm/v7,linux/arm64/v8,linux/amd64 -t xiaopeng163/flask-redis:latest .