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Peeyush Kushwaha
Asked: 2020-01-31 02:10:44 +0800 CST

Cache files that are downloaded in Dockerfile, for faster rebuilds

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I'm using apt-cache-ng which acts as a proxy between my docker build and apt packages server, so all my downloads through apt-get are cached.

I'd like to do something similar for files that I wget. For example, to install latest version of scala, I can't get it from apt and need to install it from a .deb file downloaded from their website.

Is there an easy way to cache wget calls made (maybe all HTTP(S) calls made for file downloads) when I'm building with docker?

docker

1 Answers

  1. wget supports the variables HTTP_PROXY and HTTPS_PROXY (https://stackoverflow.com/a/18722273/4124767). docker build does support setting this variables by docker build --build-arg HTTP_PROXY=http://my.proxy:8080: https://docs.docker.com/engine/reference/builder/#predefined-args

    Not sure what proxy to use. Squid? ...

    maybe squid combined with apt-cacher is interesting: https://www.porcheron.info/bandwith-optimization-squid-apt-cacher-and-jesred/

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