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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.

#!/bin/bash
set -e
set -x
# Push 200mb image
dd if=/dev/urandom of=./file.bin bs=1M count=200
docker build -t lawrencegripper/big:200mb .
docker push lawrencegripper/big:200mb
rm ./file.bin
# Push 600mb image
dd if=/dev/urandom of=./file.bin bs=1M count=600
docker build -t lawrencegripper/big:600mb .
docker push lawrencegripper/big:600mb
rm ./file.bin
# Push 1000mb image
dd if=/dev/urandom of=./file.bin bs=1M count=1000
docker build -t lawrencegripper/big:1000mb .
docker push lawrencegripper/big:1000mb
rm ./file.bin
# Push 2000mb image
dd if=/dev/urandom of=./file.bin bs=1M count=2000
docker build -t lawrencegripper/big:2000mb .
docker push lawrencegripper/big:2000mb
rm ./file.bin
view raw 1_gen_image_sizes.sh hosted with ❤ by GitHub
FROM alpine
COPY ./file.bin .
view raw 2_Dockerfile hosted with ❤ by GitHub
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