'Is there a possibility to remap Heroku PORT environment variable to another name?

I need to deploy an existing web application to Heroku using Docker and it expects the port to be passed as APPNAME_PORT and not PORT.

I know I can rebuild the Docker image to do the mapping internally, but it will be annoying to do as I'll need to have the altered Dockerfile I need to update the application. Is there a possibility to remap the environment variable to another name within Heroku?

Is there a way to do something like APPNAME_PORT=$PORT in Config Vars to store the PORT name into APPNAME_PORT environment variable?

heroku


Solution 1:[1]

Answer from Heroku support:

I'm afraid there's no native feature to alias config vars - you can do this for add-ons via the -as flag with the addons:attach command but that's only for add-ons which are irrelevant here. You would need to alias the port in your code.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Dmitry Verhoturov

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