It was a difficult task but I was motivated to try and capture these things in writing after some of the attacks on my family. ![]() The report to the UK Health & Safety Executive has been evolving very slowly, a few lines per day, over the last six months. Use ARG at all, and push that kind of logic up the stack to a Dockerfile Names: perhaps prefix something unusual and unlikely to be shadowed. To defend against the unexpected, I'd recommend using somewhat unique ARG In our case, we broke a downstream build process by defining a new environment To me this is unexpected and far less sensible: in effect, if you are buildingĪ layered image and want to use ARG, you have to be fairly sure that yourīase image doesn't define an ENV of the same name, either now or in theįuture, unless you're happy for their value to take precedence. Variables inherited from the base image also override ARGs. Things should work, but, what the documentation does not make clear is, theĮNV doesn't need to have been defined in the same Dockerfile: environment Think) be set at build time, and bleeds through to the resulting imageĮNV has been around longer, and the documentation indicates that, when bothĪre present, ENV takes precedence. RUN instructions at least, can also be interpolated, but can't (I don't ![]() This behaves a little similar to the existing instruction ENV, which, for Instructions that include the token $FOO. The value of a variable FOO is interpolated into any following This week I stumbled across a footgun in the Dockerfile/Containerfile ARGĪRG is used to define a build-time variable, possibly with a default valueĮmbedded in the Dockerfile, which can be overridden at build-time (by passing
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