Summary
Docker allows users to set both build time and run time ENV variables, and even overwrite build time ENV vars at run time.
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Additionally, environment variables can be set in.env files or in the docker-compose.yml file to be overwritten automatically.
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The command "run" can be used to assemble a Docker container and run commands such as "run" or "exit" to assemble an image.
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Summary
Docker allows users to set both build time and run time ENV variables, and even overwrite build time ENV vars at run time. Setting up a Docker image with a build argument and ENV variable can be done with Docker Compose, which supports both setting build arguments and setting environment variables at run time. Additionally, environment variables can be set in.env files or in the docker-compose.yml file to be overwritten automatically.
Docker Tip #47: Build Time vs Run Time ENV Variables
nickjanetakis.com
Summary
Docker is a text document that contains instructions for assembling an image. It must begin with a from instruction and include parser directives, syntax, and aliases. The command "run" is a command that can be used to assemble a Docker container, and it can be used to run commands such as "run" or "exit" to assemble an image.
Dockerfile reference - Docker Documentation
docker.com
