skipper VS k8tz

So my advice is: Don‘t implement anything someone else already did better and have a look at Skipper: https://github.com/zalando/skipper

That's all! You can find a complete example of an Admit func from the Validating Admission Webhook in Skipper. I've also included an abridged version at the end of this blog post.

This series is based on my experience adding a ValidatingAdmissionWebhook to Skipper, modern HTTP proxy.

You can find an abridged version of admission.Handler under "Reference". For a complete example of a validating admission webhook being used in production, checkout the validating admission webhook in Skipper, our HTTP reverse proxy.

So far I came across k8tz, which could be a solution.

i recently saw some interesting github project that use emptyDir volume that first mounts to an initContainer with script that copy files from the container to the emptyDir and after that you mount this emptyDir to your actual container. you can even mount specific files using subPath. the initContainer image is written in golang and it is conpiled in a way that it can run in empty container (FROM scratch). the binary is very small so there is no big overhead on the image size...