On Wed, 4 Mar 2020 16:56:02 -0500 Alfred von Campe <alfred at von-campe.com> wrote: > I have to support a legacy build that runs on CentOS 6. I’m new to > Docker and would like to use the official CentOS 6.10 image > (https://github.com/CentOS/sig-cloud-instance-images/blob/da050e2fc6c28d8d72d8bf78c49537247b5ddf76/docker/Dockerfile > <https://github.com/CentOS/sig-cloud-instance-images/blob/da050e2fc6c28d8d72d8bf78c49537247b5ddf76/docker/Dockerfile>) > as a Docker container on another host (probably some flavor of > Ubuntu), but can’t figure out how to tell Docker to find that image. > I also need to make some specific customizations that I would like to > distribute locally but not share with upstream. Can somebody point > me to some HOWTOs or tutorials? Most Google searches return how to > run Docker on CentOS, which is not what I’m after. You can use singularity. The following example makes an image by pulling from centos on dockerhub: singularity build c6.10.scif docker://centos:6.10 If you have an old binary, foo.x outside the container you can then: singularity exec ./c6.10.scif ./foo.x None of this requires root. More on singularity: https://sylabs.io/docs/ /Peter