Add command in Dockerfile

[c4po]

Can we add a new setting key to hold some commands in Dockerfile?
for example, we need run some commands to create a couple of folders before start the application.
or change the application configure file based on docker environment value.

[huntc]

While we're at it, it'd be great to have the option of specifying other docker commands - perhaps as a map even? The latter will then allow us to cope with new commands as they become available.

The command I want right now is ENV. :-)

[fiadliel]

I was reluctant to quickly add this feature because it'll bake in some features that I haven't fully thought about yet. But perhaps it's time to add something -- certainly running some commands after adding files to the image is very valid use case (you need to run them once, but not every time a container is started).

@huntc have you considered bashScriptExtraDefines += """export MYENV="value""""
Almost everything I've needed to do, every time I run an image, has seemed to be possible from there.

[huntc]

have you considered bashScriptExtraDefines += """export MYENV="value""""
Almost everything I've needed to do, every time I run an image, has seemed to be possible from there

Its about being able to pass in environment variables from outside of the docker container in order. I believe that is the purpose of ENV.

[fiadliel]

Not as far as I know: http://docs.docker.com/reference/builder/#env

What you want is docker run --env=... or docker run --env-file=...; that is, altering the docker binary's arguments to pull in environment variables at runtime. This does not require any particular support from the Docker image.

[huntc]

Thanks for the clarification.

[chaliy]

+1 to this, technically when you deploy to Amazon AWS Beanstalk, you also need something like this in your Dockerfile

RUN ["chmod", "+x", "bin/appname"]

without this, AWS just says that access is denied.

[frosforever]

Adding to @chaliy, this is needed anytime you zip up the containing code as file permissions are not retained in zip archives. This is not AWS specific.

[raittes]

+1