[Docker] Building Isaac Sim 5.1.0 still results in a large docker image layer

[BenjaminYde]

When building isaac sim 5.1.0 I still see in that building isaac sim (build.sh -r) still results in a very big docker image:
See my docker history command:

I only build isaac sim in the highlighted step in the image above.

The isaac sim build folder results in ~8.7G:

Other files that are not in the build folder, cached files like omniverse kit etc. are ~14GB:

It is a gigantic difference with the container I am building

Any idea why this is a big difference with the pre-built NGC container?
Do we need to download all big omniverse kit sdk files in the docker image?
Or can this be done when we launch omniverse isaac sim for the first time (so in a running container and not in the docker image build process itself?) Maybe this will result in a much smaller image. Just thinking loud here why this build step takes so much space.

[sheikh-nv]

Hi. You should get similar sizes. Try running "docker images". You should see something like this.

REPOSITORY                 TAG               IMAGE ID       CREATED              SIZE
isaac-sim-docker           latest            fe7fa2233d36   About a minute ago   15.5GB
nvcr.io/nvidia/isaac-sim   5.1.0             781acaa42e82   5 days ago           15.1GB
moby/buildkit              buildx-stable-1   44f5d48d5c6c   3 months ago         219MB

The Kit SDK is needed to run Isaac Sim. I should be included in the container itself.
Try again with a clean clone and follow the instructions from the docker readme.
After running ./tools/docker/prep_docker_build.sh the _container_temp folder should be about 15.3 GB.

[BenjaminYde]

@sheikh-nv, I investigated the tooling and made it work with our pipeline / custom tools.

From 52 GB to 20.6 GB

I have a docker image that only produces the isaac sim 5.1.0 _containertemp folder
That artifact is then copied into our devcontainer dockerfile (using multi-staged builds)
Now I don't have all the extra dev dependencies anymore to build isaac sim.