[GH-ISSUE #363] migrate NEXT_PUBLIC environment variables to server for supporting docker-image deployment #231

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opened 2026-03-03 11:14:12 +03:00 by kerem · 1 comment

kerem commented

2026-03-03 11:14:12 +03:00

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Originally created by @pavanbhaskardev on GitHub (Jul 25, 2025).
Original GitHub issue: https://github.com/dflow-sh/dflow/issues/363

Problem

When we create docker-image of nextjs-app, it'll inject NEXT_PUBLIC variables into js-bundle
After creation of docker-image if we give new value for any NEXT_PUBLIC environment variable it won't reflect

Requirements

Convert the NEXT_PUBLIC to server environment variables so they can be added dynamically during the build-time
Pass the server variables to client-side using React-context-provider

Benifits

Self-hosting setup becomes more easy

Originally created by @pavanbhaskardev on GitHub (Jul 25, 2025). Original GitHub issue: https://github.com/dflow-sh/dflow/issues/363 ### Problem - When we create docker-image of nextjs-app, it'll inject NEXT_PUBLIC variables into js-bundle - After creation of docker-image if we give new value for any NEXT_PUBLIC environment variable it won't reflect ### Requirements - Convert the NEXT_PUBLIC to server environment variables so they can be added dynamically during the build-time - Pass the server variables to client-side using [React-context-provider](https://react.dev/reference/react/createContext) ### Benifits - Self-hosting setup becomes more easy

kerem

2026-03-03 11:14:12 +03:00

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kerem commented

2026-03-03 11:14:12 +03:00

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@pavanbhaskardev commented on GitHub (Jul 29, 2025):

Found an example in nhost where they're building NEXT_PUBLIC environment variables with static values

# DockerFile
ENV NEXT_PUBLIC_NHOST_ADMIN_SECRET=__NEXT_PUBLIC_NHOST_ADMIN_SECRET__
ENV NEXT_PUBLIC_NHOST_AUTH_URL=__NEXT_PUBLIC_NHOST_AUTH_URL__

ENTRYPOINT ["./docker-entrypoint.sh"]

in docker-entrypoint.sh they're replacing the __NEXT_PUBLIC_NHOST_AUTH_URL__ placehoder values with original values

# replace placeholders
find dashboard -type f -exec sed -i "s~__NEXT_PUBLIC_NHOST_ADMIN_SECRET__~${NEXT_PUBLIC_NHOST_ADMIN_SECRET}~g" {} +
find dashboard -type f -exec sed -i "s~__NEXT_PUBLIC_NHOST_AUTH_URL__~${NEXT_PUBLIC_NHOST_AUTH_URL}~g" {} +

implemented same approach it's working fine!

@pavanbhaskardev commented on GitHub (Jul 29, 2025): 1. Found an example in [nhost](https://github.com/nhost/nhost/tree/main) where they're building NEXT_PUBLIC environment variables with static values ```bash # DockerFile ENV NEXT_PUBLIC_NHOST_ADMIN_SECRET=__NEXT_PUBLIC_NHOST_ADMIN_SECRET__ ENV NEXT_PUBLIC_NHOST_AUTH_URL=__NEXT_PUBLIC_NHOST_AUTH_URL__ ENTRYPOINT ["./docker-entrypoint.sh"] ``` 2. in `docker-entrypoint.sh` they're replacing the `__NEXT_PUBLIC_NHOST_AUTH_URL__` placehoder values with original values ```bash # replace placeholders find dashboard -type f -exec sed -i "s~__NEXT_PUBLIC_NHOST_ADMIN_SECRET__~${NEXT_PUBLIC_NHOST_ADMIN_SECRET}~g" {} + find dashboard -type f -exec sed -i "s~__NEXT_PUBLIC_NHOST_AUTH_URL__~${NEXT_PUBLIC_NHOST_AUTH_URL}~g" {} + ``` 3. implemented same approach it's working fine!