This is a small piece of example code showing how to create a Docker container running a headless Objective-C application (in this case: a small web server). This is more an exercise in demonstrating the general concept: Having deterministically built images with development tools and runtime dependencies and coordinating them to deploy the compiled artifact with minimal cruft. The build scripts for the base images are available in the gnustep-boxes project.
- Invoke the
build_outer.shscript with any parameters you'd like to pass to the finaldocker buildcommand. For example, you may want to pass the repository/tag that you want to save the image under (-t my/useless-thing). - The scripts spins up a
gnustep-headless-devcontainer (which has all the build tools), shares the repository directory and the host's docker socket with it. In this container, thebuild_inner.shscript is then run. build_inner.shinstalls the dependencies not bundled with the base image, as well as the app itself into a staging directory.docker buildis invoked to build a new image based on thegnustep-headless-rtruntime image, by just copying the staged dependencies into the correct location in the filesystem.- Run a container based on that image as usual:
docker run --rm -p 8080:8080 my/useless-thing - Point your browser at the docker host's IP at port 8080 and be greeted by ‘Hello World’.
Honestly? Not much. It just responds to a GET request with a static string. It demonstrates, however, how to handle requests asynchronously using libdispatch.
Copyright (c) 2016 Niels Grewe
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