What are the different types of environment variables in Docker?
An example of an AI chatbot conversation about Docker environment variable types.
What are the different types of environment variables in Docker?
In Docker, environment variables can be classified into three main types: build-time variables, runtime variables, and default variables.
Can you explain what build-time variables are?
Build-time variables are set during the image build process using the ARG instruction in the Dockerfile. They are not available at runtime.
And what about runtime variables?
Runtime variables are defined using the ENV instruction in the Dockerfile or passed at container start time using the -e flag. They are available during the container's execution.
What are default variables?
Default variables are predefined environment variables that Docker sets automatically, such as HOSTNAME and PATH.
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