<![CDATA[Dockerfile with 2 x FROM sources]]>I've seen a few interesting FOSS apps which in their Dockerfiles have 2 FROM ... statements.
e.g.

FROM elixir:1.12-alpine as build
...
...
FROM elixir:1.12-alpine
...
...

Ignoring that these examples are not the Cloudron base images, just wondering how this might be handled in building a Cloudron package. Is it possible ?
Probably going will turn out to be a dumb question : humour the newbie

]]>https://forum.cloudron.io/topic/6434/dockerfile-with-2-x-from-sourcesRSS for NodeMon, 20 Apr 2026 03:01:27 GMTThu, 03 Feb 2022 17:31:13 GMT60<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 22:33:00 GMT]]>@fbartels thanks, nice example šŸ‘

]]>https://forum.cloudron.io/post/42850https://forum.cloudron.io/post/42850Thu, 03 Feb 2022 22:33:00 GMT<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 21:37:58 GMT]]>@timconsidine Multi stage builds are super easy to use. As long as binaries are compatible, you could even pull binaries from pre existing containers.

Iā€™m doing the same in https://github.com/fbartels/cloudron-drone-app/blob/master/Dockerfile

]]>https://forum.cloudron.io/post/42848https://forum.cloudron.io/post/42848Thu, 03 Feb 2022 21:37:58 GMT<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 21:20:07 GMT]]>@girish thanks, will research and play around a bit

]]>https://forum.cloudron.io/post/42845https://forum.cloudron.io/post/42845Thu, 03 Feb 2022 21:20:07 GMT<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 19:12:06 GMT]]>This style is called multistage builds, if you want to search/read more. FWIW, they will work fine on Cloudron, we use standard docker images. That all our apps use cloudron/base:3.2.0 as the base image is only a convention that helps us maintain things more easily. (as in, if each each app package had it's own coding style and convention, it becomes hard for us to navigate the code and update them).

]]>https://forum.cloudron.io/post/42841https://forum.cloudron.io/post/42841Thu, 03 Feb 2022 19:12:06 GMT<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 18:08:02 GMT]]>@mehdi thanks for the explanation šŸ‘
Maybe I will get brave and try it out on a project

]]>https://forum.cloudron.io/post/42837https://forum.cloudron.io/post/42837Thu, 03 Feb 2022 18:08:02 GMT<![CDATA[Reply to Dockerfile with 2 x FROM sources on Thu, 03 Feb 2022 17:56:24 GMT]]>@timconsidine This is just a Docker syntax that allow you to have a temporary container that does some stuff (usually building things), then you can access files built during previous steps in subsequent ones and add them to your image.

Basically, it's just a way to simplify cleanup : instead of installing a bunch of tools that you only need during build time, then having to remove them (or worse, leave them in the final image), you can do the build in the temporary container, then import the build results in the final container.

]]>https://forum.cloudron.io/post/42835https://forum.cloudron.io/post/42835Thu, 03 Feb 2022 17:56:24 GMT