How to setup Node environment variable in Dockerfile for running node.js application?

Question

Can anyone suggest how can I setup NODE_ENV variable in dockerfile when running a node app.

Possible duplicate of How to pass environment variables to docker containers? — Thilo
– Thilo, Commented Mar 24, 2017 at 6:00

Chris Overgaauw · Accepted Answer · 2017-03-25 05:37:09Z

37

There a two ways, while building the image or when running the container.

For builds:

Add to your Dockerfile

ENV NODE_ENV=whatEver

Or use build arguments if you don't want them to stick during runtime Docker build --build-args NODE_ENV whatEver

When running:

Run your container with "-e"

docker run -e NODE_ENV=whatever mycontainer

Chris Overgaauw

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answered Mar 24, 2017 at 6:24

opHasNoName

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2 Comments

Can this be combined (does the runtime setting override the build-time setting)?

yep it does override the image environment variable