For the LightBuildServer (LBS) I want to run some of my nightly builds already against Fedora 25 Beta, to see if I need to fix anything in the Mono packages for Fedora.

But there is no Beta image for Fedora 25 available at Docker Hub:

But here you can find an image for Fedora 25 Beta:

So I download the image, and load the image like this:

cd /var/lib/docker
docker load -i /var/lib/docker/Fedora-Docker-Base-25_Beta-1.1.x86_64.tar.xz

You can see the image listed, when typing docker images:

REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
fedora-docker-base-25_beta-1.1.x86_64      latest              a85629813141        8 days ago          197.8 MB

Now I can reference it in my Dockerfile like this:

FROM fedora-docker-base-25_beta-1.1.x86_64:latest

Make sure to use the image name in lower case.

Using Fedora 25 Beta in Docker for LightBuildServer
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