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Generate docker images of specific size

For some testing I’m doing I need a set of images of a specific size to simulate pulling larger vs smaller image.

Here is a quick script I put together for generating a 200mb, 600mb, 1000mb and 2000mb image (tiny bit larger as alpine included). Took a while to work out best to use /dev/urandom not /dev/zero as with zero the images got compressed for transfer.

Standard

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