Docker - environment variable during build


Yes it is quite possible to set environment variable during build ,

Example snippet from Dockerfile,

RUN cd c:\app; .\some.install --version $($env:CLIVERSION)

If you notice code above, you can immediately tell that , $($env:VERSION)  is the variable. 

So when we  run it we do something like :-

docker build -t  netcorebuilder --build-arg VERSION=1.0.19

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If you're getting  exception when trying to assigned key to a symmetric key and getting error message below :- The specified initialization vector (IV) does not match the block size for this algorithm And your code probably look like something below :- Then you need to go into debug mode and start looking into the supported size for IV as shown in diagram below :- As you can see, IV is 16 bytes, so you need to provide 16 bytes. The same goes for Key field too, if you're adding anything to it. As long as you provide a valid key size, then we're good and you're code will be ready.
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