Docker Context

Demonstrate how to work with Docker context.

TODO:

Test if modifying the dockerignore causes a cache invalidation in the correct places.

📋 Script to follow

Show a docker context issue (large files)
Using .dockerignore to prevent bloating the docker context and increasing build times.
Use a selective whitelist in the context.

ℹ️ NOTES:

If you're building an image and installing node_modules inside the container you should using a .dockerignore file.

# make a large file
mkfile 200m ./large_file.bin

# rebuild the image (included in context)
docker build --no-cache -f Dockerfile.bash -t scratchtest .

# rebuild (it will not copy the 200mb file into the context)
docker build --no-cache -f ./Dockerfile.ignored -t scratchtest .

# exclude everything and select some folders
docker build --no-cache -f Dockerfile.whitelist -t whitelisttest ../

How to specify different .dockerignore files for different builds in the same project? here
dockerignore file to ignore everything except two folders and their contents is not working here