Specifying basing on i386/i686 container in Dockerfile for usage in Docker on amd64











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Distros, e.g. Ubuntu, do offer base images in multiple architectures; in fact, the specification of multi-arch images is now part of docker manifest file format.



Anyway, for CI builders, I'd need to automatedly build and run an 32bit docker image on a 64 bit machine.



I just can't seem to figure out how to specify in a Dockerfile that I want the i686 architecture variant of the ubuntu base in my FROM ubuntu:18.04 line.



(same, by the way, goes for Fedora images.)



For clarification: I'm not looking for info like FROM i386/ubuntu, or that I can build FROM scratch and ADD a 32bit tar.

I want to know how I can tell FROM that I mean the xyz architecture of a multiarch Dockerhub repo, so, I'm looking for something that does (I hope I get the idea across) 



FROM ubuntu:18.04:arch=xyz





docker dockerfile 32bit-64bit







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    up vote
    0
    down vote

    favorite
    1












    Distros, e.g. Ubuntu, do offer base images in multiple architectures; in fact, the specification of multi-arch images is now part of docker manifest file format.



    Anyway, for CI builders, I'd need to automatedly build and run an 32bit docker image on a 64 bit machine.



    I just can't seem to figure out how to specify in a Dockerfile that I want the i686 architecture variant of the ubuntu base in my FROM ubuntu:18.04 line.



    (same, by the way, goes for Fedora images.)



    For clarification: I'm not looking for info like FROM i386/ubuntu, or that I can build FROM scratch and ADD a 32bit tar.

    I want to know how I can tell FROM that I mean the xyz architecture of a multiarch Dockerhub repo, so, I'm looking for something that does (I hope I get the idea across) 



    FROM ubuntu:18.04:arch=xyz





    docker dockerfile 32bit-64bit







    share|improve this question


























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      down vote

      favorite
      1









      up vote
      0
      down vote

      favorite
      1






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      Distros, e.g. Ubuntu, do offer base images in multiple architectures; in fact, the specification of multi-arch images is now part of docker manifest file format.



      Anyway, for CI builders, I'd need to automatedly build and run an 32bit docker image on a 64 bit machine.



      I just can't seem to figure out how to specify in a Dockerfile that I want the i686 architecture variant of the ubuntu base in my FROM ubuntu:18.04 line.



      (same, by the way, goes for Fedora images.)



      For clarification: I'm not looking for info like FROM i386/ubuntu, or that I can build FROM scratch and ADD a 32bit tar.

      I want to know how I can tell FROM that I mean the xyz architecture of a multiarch Dockerhub repo, so, I'm looking for something that does (I hope I get the idea across) 



      FROM ubuntu:18.04:arch=xyz





      docker dockerfile 32bit-64bit







      share|improve this question















      Distros, e.g. Ubuntu, do offer base images in multiple architectures; in fact, the specification of multi-arch images is now part of docker manifest file format.



      Anyway, for CI builders, I'd need to automatedly build and run an 32bit docker image on a 64 bit machine.



      I just can't seem to figure out how to specify in a Dockerfile that I want the i686 architecture variant of the ubuntu base in my FROM ubuntu:18.04 line.



      (same, by the way, goes for Fedora images.)



      For clarification: I'm not looking for info like FROM i386/ubuntu, or that I can build FROM scratch and ADD a 32bit tar.

      I want to know how I can tell FROM that I mean the xyz architecture of a multiarch Dockerhub repo, so, I'm looking for something that does (I hope I get the idea across) 



      FROM ubuntu:18.04:arch=xyz





      docker dockerfile 32bit-64bit




      docker dockerfile 32bit-64bit






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 10 at 9:24

























      asked Nov 10 at 8:47









      Marcus Müller

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