Ignore Files Across All Subdirectories in .dockerignore

Ignoring files within directories using .dockerignore is a bit different compared to .gitignore.

To ignore a file across all subdirectories, prefix the filename with **. For example, to ignore the file file.txt in all subdirectories, add the following to .dockerignore:

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**file.txt

Another example to ignore .DS_Store files on MacOS devices:

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**.DS_Store

To ignore a specific file extension across all subdirectories, prefix the file extension with **/*. In this example, all files with the .txt extension will be ignored by Docker:

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**/*.txt

Also, keep in mind that .dockerignore should be in the root of the context you are passing in to Docker or it won’t be taken into account.